阅读说明：本技术 闸阀 (Gate valve ) 是由 朱昌军 张春生 谭建华 邹凯 杨刚 徐乐乐 韩占方 付江 薛原 王书国 张效东 于 2018-06-05 设计创作，主要内容包括：本发明提供一种闸阀,该闸阀包括：阀盖、轴承、盖板以及阀杆；阀盖上设置有轴承孔,轴承孔的底端设置有止挡凸缘,轴承设置在轴承孔内,且轴承的底端抵顶在止挡凸缘上；阀杆穿设在轴承孔内,阀杆上设置有第一止挡部,第一止挡部抵顶在轴承的顶端；阀杆上可拆卸的设置有第二止挡部,第二止挡部位于止挡凸缘的下部；盖板设置在轴承孔的顶端,盖板可拆卸的与阀盖连接。当阀杆因被腐蚀而断裂时,第二止挡部抵顶在止挡凸缘上,以阻止阀杆由轴承孔内飞出,避免对操作人员造成伤害。(the present invention provides a gate valve, comprising: the valve comprises a valve cover, a bearing, a cover plate and a valve rod; the valve cover is provided with a bearing hole, the bottom end of the bearing hole is provided with a stop flange, the bearing is arranged in the bearing hole, and the bottom end of the bearing abuts against the stop flange; the valve rod penetrates through the bearing hole, a first stopping part is arranged on the valve rod, and the first stopping part abuts against the top end of the bearing; the valve rod is detachably provided with a second stopping part which is positioned at the lower part of the stopping flange; the apron sets up on the top of dead eye, apron detachable and valve gap connection. When the valve rod is broken due to corrosion, the second stopping part is abutted against the stopping flange to prevent the valve rod from flying out from the bearing hole, so that the injury to operators is avoided.)

1. A gate valve, comprising: the valve comprises a valve cover, a bearing, a cover plate and a valve rod; the valve cover is provided with a bearing hole, the bottom end of the bearing hole is provided with a stop flange, the bearing is arranged in the bearing hole, and the bottom end of the bearing abuts against the stop flange; the valve rod penetrates through the bearing hole, a first stopping part is arranged on the valve rod, and the first stopping part abuts against the top end of the bearing; a second stopping part is detachably arranged on the valve rod and is positioned at the lower part of the stopping flange; the cover plate is arranged at the top end of the bearing hole, and the cover plate is detachably connected with the valve cover.

2. The gate valve of claim 1, further comprising a sealing block, wherein the sealing block is provided with a sliding hole, the valve rod is inserted into the sliding hole, and the sealing block is located between the second stopper and the stopper flange.

3. The gate valve of claim 2, further comprising an abutting spring, wherein two ends of the abutting spring are respectively connected to the sealing block and the second stopper.

4. The gate valve of claim 2, wherein the sealing block is frustoconical, and a surface area of a top end of the sealing block is greater than a surface area of a bottom end of the sealing block.

5. the gate valve of claim 4, wherein the stop flange is formed with a tapered surface that mates with the sealing block.

6. A gate valve according to any of the claims 1-5, characterized in that the gate valve further comprises a first sealing ring, which is arranged between the bearing and the stop flange.

7. The gate valve of claim 6, further comprising a second seal ring disposed between the cover plate and the bonnet.

8. the gate valve of any one of claims 1 to 5, wherein the valve stem comprises a first section and a second section, the first section being connected to the valve cap and the second section being connected to the valve plate; the first section is provided with a driving external thread, the second section is internally provided with a driving threaded hole, and the driving external thread is matched with the driving threaded hole.

9. A gate valve according to any of claims 1-5, further comprising a drive part, which is in driving connection with the top end of the valve stem.

10. The gate valve of claim 9, wherein the drive portion comprises a drive wheel coaxially disposed with the valve stem and drivingly connected to the valve stem.

Technical Field

The invention relates to the technical field of fluid conveying equipment, in particular to a gate valve.

Background

in the oil and gas exploitation process, oil and gas in an oil and gas well are conveyed to a storage device or a combined station through a pipeline; therefore, how to control the on-off of the pipeline becomes the key for safe operation of the process.

disclosure of Invention

In view of this, the present invention provides a gate valve to solve the problem in the prior art that the position of the valve rod contacting the valve plate is easily corroded and broken, so that the valve rod is separated from the valve plate; because the oil gas in the pipeline has certain pressure, when dismantling the apron, under the effect of pressure, the valve rod is to deviating from the direction departure of disk seat, causes the technical problem that injury and oil gas leaked easily to operating personnel.

The invention provides a gate valve, comprising: the valve comprises a valve cover, a bearing, a cover plate and a valve rod; the valve cover is provided with a bearing hole, the bottom end of the bearing hole is provided with a stop flange, the bearing is arranged in the bearing hole, and the bottom end of the bearing abuts against the stop flange; the valve rod penetrates through the bearing hole, a first stopping part is arranged on the valve rod, and the first stopping part abuts against the top end of the bearing; a second stopping part is detachably arranged on the valve rod and is positioned at the lower part of the stopping flange; the cover plate is arranged at the top end of the bearing hole, and the cover plate is detachably connected with the valve cover.

The gate valve as described above preferably further includes a sealing block, the sealing block is provided with a sliding hole, the valve rod is inserted into the sliding hole, and the sealing block is located between the second stopper portion and the stopper flange.

In the gate valve, preferably, the gate valve further includes an abutting spring, and two ends of the abutting spring are respectively connected to the sealing block and the second stopper.

in the gate valve, the sealing block is preferably in a circular truncated cone shape, and a surface area of a top end of the sealing block is larger than a surface area of a bottom end of the sealing block.

in the gate valve as described above, preferably, the stopper flange has a tapered surface formed thereon to be fitted to the seal block.

In the gate valve described above, preferably, the gate valve further includes a first seal ring disposed between the bearing and the stopper flange.

In the gate valve, preferably, the gate valve further includes a second sealing ring, and the second sealing ring is disposed between the cover plate and the valve cover.

in the gate valve as described above, preferably, the valve rod includes a first section and a second section, the first section is connected to the valve cover, and the second section is connected to the valve plate; the first section is provided with a driving external thread, the second section is internally provided with a driving threaded hole, and the driving external thread is matched with the driving threaded hole.

in the gate valve, it is preferable that the gate valve further includes a driving portion, and the driving portion is in transmission connection with a top end of the valve stem.

in the gate valve, the driving part preferably includes a driving wheel, and the driving wheel is coaxially disposed with the valve rod and is in transmission connection with the valve rod.

According to the gate valve provided by the invention, the stop flange is arranged at the bottom end of the bearing hole, the bearing is arranged in the bearing hole, and the bottom end of the bearing abuts against the stop flange; the valve rod penetrates through the bearing hole, a first stopping part is arranged on the valve rod, and the first stopping part abuts against the top end of the bearing; the valve rod is detachably provided with a second stopping part which is positioned at the lower part of the stopping flange; when the valve rod is broken due to corrosion, the second stopping part is abutted against the stopping flange to prevent the valve rod from flying out from the bearing hole, so that the damage to operators and the oil gas leakage are avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

fig. 1 is a schematic structural diagram of a gate valve according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic structural diagram of a gate valve according to another embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at B;

FIG. 5 is a schematic structural diagram of a gate valve according to yet another embodiment of the present invention;

FIG. 6 is an enlarged view of a portion of FIG. 5 at C;

FIG. 7 is a schematic structural diagram of a gate valve according to still another embodiment of the present invention;

Fig. 8 is a partial enlarged view of fig. 7 at D.

Description of reference numerals:

10. a valve body;

101. A valve cavity;

102. A connecting portion;

20. A valve plate;

30. A valve stem;

301. a first stopper portion;

302. A second stopper portion;

303. A sealing block;

304. A propping spring;

40. A valve cover;

401. A stop flange;

402. Sealing and filling;

403. Abutting against the flange;

404. A connecting plate;

50. A cover plate;

60. A bearing;

70. And a driving wheel.

Detailed Description

in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of a gate valve according to an embodiment of the present invention; fig. 2 is a partially enlarged view of a portion a in fig. 1.

please refer to fig. 1 and fig. 2. An embodiment of the present invention provides a gate valve, including: a valve cover 40, a bearing 60, a cover plate 50 and a valve rod 30; a bearing hole is formed in the valve cover 40, a stop flange 401 is arranged at the bottom end of the bearing hole, the bearing 60 is arranged in the bearing hole, and the bottom end of the bearing 60 abuts against the stop flange 401; the valve rod 30 penetrates through the bearing hole, a first stopping part 301 is arranged on the valve rod 30, and the first stopping part 301 abuts against the top end of the bearing 60; a second stopping portion 302 is detachably arranged on the valve rod 30, and the second stopping portion 302 is located at the lower portion of the stopping flange 401; the cover plate 50 is disposed at the top end of the bearing hole, and the cover plate 50 is detachably connected to the valve cover 40.

Specifically, the gate valve further comprises a valve body 10, and the valve body 10 can be in a cylindrical shape with a cross section being in a shape of a circle, a rectangle, a triangle, or the like, or the valve body 10 is in other irregular shapes; a valve cavity 101 is formed by extending one end of the valve body 10 to the other end, an inlet and an outlet are formed at two ends of the valve cavity 101, a connecting part 102 is arranged on the side wall of the valve body 10, and a telescopic hole is formed in the connecting part 102 and penetrates through the valve cavity 101; the valve plate 20 and the valve rod 30 are inserted into the valve chamber 101 through the telescopic hole, and the valve cover 40 is provided outside the connecting portion 102.

For convenience of description, taking the valve body 10 as an example in a cylindrical shape, correspondingly, the inlet and the outlet are respectively openings formed at two ends of the valve cavity 101, the inlet pipe is communicated with the inlet, the outlet pipe is communicated with the outlet, the inlet pipe is communicated with the process upstream flow, and the outlet pipe is communicated with the process downstream flow. The valve body 10 may be mainly made of metal material such as copper, iron, aluminum, or the like, or the valve body 10 may be mainly made of non-metal material such as plastic. The valve cavity 101 is provided with a slot matched with the valve plate 20, and when the valve rod 30 is rotated towards a preset direction to drive the valve plate 20 to move towards the valve cavity 101, the valve plate 20 is inserted into the slot to further close the valve cavity 101, so that oil gas is prevented from flowing from an inlet to an outlet.

Preferably, valve plate 20 may be a metal plate mainly made of metal materials such as copper, iron, and aluminum, or a non-metal plate mainly made of non-metals such as plastic and rubber, for valve plate 20; when the valve plate 20 is made of a material other than rubber, sealing layers are required to be respectively arranged on two sides of the valve plate 20, and the sealing layers can be rubber sheets mainly made of rubber; when valve plate 20 is inserted into the slot, the rubber layer on valve plate 20 contacts the sidewall of the slot to prevent oil from flowing through the gap between the slot and valve plate 20, so that when the gate valve is closed, oil still flows from the inlet to the outlet.

Preferably, a first connection flange and a second connection flange are respectively formed at two ends of the valve body 10, the first connection flange is provided with a first connection hole, and the second connection flange is provided with a second connection hole; a first assembling flange is formed on the outer side of the inlet pipe, a third connecting hole is formed in the first assembling flange, and a first fastening bolt is respectively arranged in the first connecting hole and the third connecting hole in a penetrating manner so as to connect the first connecting flange and the first assembling flange together and further realize the communication between the inlet pipe and the inlet; the outside of outlet pipe is formed with the second assembly flange, has seted up the fourth connecting hole on the second assembly flange, and second fastening bolt wears to establish respectively in second connecting hole and fourth connecting hole to realize being connected between second connecting flange and the second assembly flange, in order to realize the intercommunication between export and the outlet pipe.

further preferably, a first sealing ring is clamped between the first connecting flange and the first assembling flange to enhance the sealing performance between the first connecting flange and the first assembling flange, so as to prevent oil gas or natural gas from flowing out from between the first connecting flange and the first assembling flange. And a second sealing ring is clamped between the second connecting flange and the second assembling flange to enhance the sealing property between the second connecting flange and the second assembling flange so as to prevent oil and gas from flowing out from the space between the second connecting flange and the second assembling flange. The first sealing ring and the second sealing ring can be both rubber rings; of course, the first seal ring and the second seal ring may both be metal rings.

Specifically, the gate valve further comprises a valve plate 20, and the valve plate 20 is connected with the valve rod 30; the connected mode between valve plate 20 and valve rod 30 in this embodiment can have the multiple, as long as guarantee when torsion valve rod 30, can drive valve plate 20 along the direction removal that is on a parallel with valve rod 30 axis can to realize opening and closing of gate valve. For example: threaded holes are formed in the top end, facing the valve cover 40, of the valve plate 20, external threads are correspondingly arranged on the side wall of the valve rod 30 and matched with the threaded holes, so that the valve plate 20 is driven to move when the valve rod 30 is rotated, and opening and closing of the gate valve are achieved. Preferably, a driving portion is formed at the top end of the valve plate 20 to protrude toward the outlet, and a screw hole is formed at the driving portion such that the screw hole communicates only with the valve chamber 101 between the valve plate 20 and the outlet; because the oil gas pressure in the outlet pipe communicated with the outlet is lower, the phenomenon that the oil gas flows to the bearing hole in the valve cover 40 through the threaded hole to further influence the work of the bearing 60 in the bearing hole due to the fact that the pressure in the valve cavity 101 where the threaded hole is located is too high can be avoided.

In this embodiment, the valve cover 40 may have various shapes, and the valve cover 40 may have a regular shape such as a circle, a triangle, a rectangle, or other irregular shapes; as long as the valve cover 40 can seal the telescopic hole. The valve cover 40 can be connected with the valve body 10 in a bolt connection mode, and in order to ensure the sealing performance between the valve cover 40 and the valve body 10, a third sealing ring mainly made of rubber or metal can be arranged between the valve cover 40 and the connecting part 102, and the third sealing ring can be in an O shape; preferably, a first annular groove and a second annular groove are formed at the top end of the connection portion 102 and the bottom end of the valve cover 40, respectively, and third sealing rings are disposed in the first annular groove and the second annular groove, respectively, to further increase the contact area between the valve cover 40 and the connection portion 102, and further improve the sealing property between the valve cover 40 and the connection portion 102.

Specifically, the valve cover 40 has a protrusion at the top end thereof, which may be connected to the valve plate 20 by welding, or integrally formed with the valve plate 20 by casting; the bearing hole has been seted up on the bulge, and the bearing hole runs through bulge and valve gap 40 and communicates with valve chamber 101, and the lateral wall of bearing hole bottom forms backstop flange 401 to inside protrusion, and backstop flange 401 supports and leans on the outer lane of bearing 60 to prevent bearing 60 downstream, backstop flange 401 encloses to establish and is the connecting hole, and valve rod 30 wears to establish in the connecting hole.

The valve rod 30 is arranged in the inner ring of the bearing 60 in a penetrating manner, the outer ring of the bearing 60 is connected with the side wall of the bearing hole, the first stopping portion 301 is positioned at the upper part of the bearing 60, and the first stopping portion 301 is abutted against the inner ring of the bearing 60. The first blocking portion 301 may be integrally formed with the valve rod 30 by casting, or the first blocking portion 301 may be connected to the valve rod 30 by welding.

preferably, the bearing 60 in this embodiment may be various, as long as it is ensured that the bearing 60 can bear radial force and certain axial force, for example: when the mass of valve plate 20 and the switching load are small, bearing 60 may be a deep groove ball bearing; when the mass of valve plate 20 and the switching load are large, bearing 60 may be an angular contact ball bearing or a tapered roller bearing, etc. to bear a large axial force.

Specifically, the second blocking portion 302 is located at the lower portion of the blocking flange 401, and the top end of the second blocking portion 302 may abut against the bottom end of the blocking flange 401, or a certain distance is formed between the top end of the second blocking portion 302 and the bottom end of the blocking flange 401.

Preferably, the detachable connection between the second stopper 302 and the valve rod 30 in this embodiment may be various, for example: the second stopping portion 302 may be annular, the second stopping portion 302 is provided with a stopping internal thread, and correspondingly, the valve rod 30 is provided with a stopping external thread, and the stopping internal thread is matched with the stopping external thread to realize the detachable connection between the second stopping portion 302 and the valve rod 30; or, a first pin hole is formed in the second stopper portion 302, a second pin hole is correspondingly formed in the valve rod 30, the pin penetrates through the first pin hole and the second pin hole, in order to avoid the pin from being separated from the first pin hole and the second pin hole, abutting external threads can be formed at two ends of the pin, and the two abutting bolts are respectively matched with the abutting external threads at two ends of the pin. The second stopping portion 302 may also be cylindrical, a connecting external thread may be disposed on the corresponding second stopping portion 302, a connecting threaded hole is disposed on the valve rod 30, and the connecting external thread is matched with the connecting threaded hole to realize connection between the second stopping portion 302 and the valve rod 30; alternatively, the valve rod 30 is provided with a through hole, and the second stopper portion 302 is inserted into the through hole.

In this embodiment, preferably, the second stopping portion 302 is annular, a fastening threaded hole is formed in the second stopping portion 302, a corresponding fastening external thread matched with the fastening threaded hole is formed on the outer wall of the valve rod 30, and the second stopping portion 302 is detachably connected to the valve rod 30 through the fastening threaded hole and the fastening external thread; the upper surface of the second blocking portion 302 is used to abut against the stopping flange 401, and in order to ensure the sealing performance between the second blocking portion 302 and the stopping flange 401, a sealing gasket may be disposed on the upper surface of the second blocking portion 302, and when the second blocking portion 302 contacts with the stopping flange 401, the sealing gasket may seal a gap between the second blocking portion 302 and the stopping flange 401. The sealing washer may be a rubber ring or a plastic ring, or may be a metal ring.

The detachable connection between the cover plate 50 and the valve cover 40 may be various, for example: the cover plate 50 covers the outside of the bearing hole, a shaft hole is formed in the cover plate 50, the valve rod 30 penetrates through the shaft hole, and the cover plate 50 can be connected with the valve cover 40 in a bolt connection mode; preferably, in order to ensure the sealing performance between the cover plate 50 and the valve rod 30, an oil seal may be provided in the shaft hole, and the valve rod 30 is connected to a side wall of the shaft hole through the oil seal. Or, the lower part of the cover plate 50 is provided with a stud, the stud is provided with a shaft hole of which the central line is collinear with the axis of the stud, a bearing hole is provided with a connecting internal thread, and the stud is matched with the connecting internal thread, so that the cover plate 50 is detachably connected with the valve cover 40.

The use process of the gate valve that this embodiment provided does: the valve rod 30 is twisted in the preset direction, so that the valve rod 30 drives the valve plate 20 to move upwards, oil gas at the inlet can flow to the outlet, and the gate valve is opened; the valve rod 30 is twisted in the opposite direction of the preset direction, and the valve plate 20 is driven to move in the valve cavity 101, so that oil gas is prevented from flowing from the inlet to the outlet, and the gate valve is closed. When the bearing 60 of the gate valve is to be maintained, the cover plate 50 is removed from the valve cover 40, and the bearing 60 is replaced or lubricating oil or grease is added to the bearing 60.

If the valve rod 30 connected to the valve plate 20 is corroded due to contact with impurities in oil gas in the valve cavity 101 and then breaks, after the cover plate 50 is removed from the valve cover 40, the valve rod 30 moves upward under the action of pressure, so that the second stopping portion 302 abuts against the stopping flange 401, and the valve rod 30 is prevented from flying out of the bearing hole.

According to the gate valve provided by the embodiment, the stop flange 401 is arranged at the bottom end of the bearing hole, the bearing 60 is arranged in the bearing hole, and the bottom end of the bearing 60 abuts against the stop flange 401; the valve rod 30 penetrates through the bearing hole, a first stopping part 301 is arranged on the valve rod 30, and the first stopping part 301 abuts against the top end of the bearing 60; a second stopping portion 302 is detachably arranged on the valve rod 30, and the second stopping portion 302 is located at the lower portion of the stopping flange 401; when the valve rod 30 is broken due to corrosion, the second stopping portion 302 abuts against the stopping flange 401 to prevent the valve rod 30 from flying out from the bearing hole, thereby avoiding injury to operators.

FIG. 3 is a schematic structural diagram of a gate valve according to another embodiment of the present invention; fig. 4 is a partially enlarged view of fig. 3 at B.

please refer to fig. 3 and 4. Specifically, the gate valve further includes a sealing block 303, a sliding hole is disposed on the sealing block 303, the valve rod 30 is inserted into the sliding hole, and the sealing block 303 is located between the second stopper portion 302 and the stopper flange 401. When the valve rod 30 is broken, the valve rod 30 moves upward under the action of the pressure in the valve cavity 101, and then abuts against the sealing block 303, so that the sealing block 303 is pressed on the stop flange 401, and the bottom end of the bearing hole is sealed, and oil gas in the valve cavity 101 is prevented from entering the bearing hole.

Preferably, the shape of the sealing block 303 can be varied, for example: the sealing block 303 may have a plate shape, and when the valve rod 30 is broken, the sealing block 303 may be covered on the bottom end of the stopping flange 401 under the abutment of the second stopper portion 302.

preferably, the material of the sealing block 303 in this embodiment may be various, for example: the sealing block 303 may be a rubber block mainly made of rubber, or the sealing block 303 may be a plastic block mainly made of plastic, but the sealing block 303 may be a metal block mainly made of metal such as stainless steel.

FIG. 5 is a schematic structural diagram of a gate valve according to yet another embodiment of the present invention; fig. 6 is a partially enlarged view of C in fig. 5.

Please refer to fig. 5 and 6. Specifically, the gate valve further includes an abutting spring 304, and both ends of the abutting spring 304 are respectively connected to the sealing block 303 and the second stopper portion 302. Under the elastic force of the abutting spring 304, the sealing block 303 always abuts against the stop flange 401, so that oil gas in the valve cavity 101 is prevented from entering the bearing hole when the gate valve is normally used.

Preferably, the abutting spring 304 may be a coil spring, the valve rod 30 is inserted into the coil spring, and two ends of the coil spring abut against the second stopping portion 302 and the sealing block 303 respectively; or the abutting spring 304 is a plate spring, and two ends of the plate spring may be connected to the second stopping portion 302 and the sealing block 303 respectively in a welding manner, or two ends of the plate spring may be connected to the second stopping portion 302 and the sealing block 303 respectively in a bolt connection manner.

with continued reference to fig. 4. Specifically, the sealing block 303 is in a circular truncated cone shape, and the surface area of the top end of the sealing block 303 is larger than the surface area of the bottom end of the sealing block 303. The stopper flange 401 encloses a connection hole through which the valve rod 30 passes, the top end of the sealing block 303 can be inserted into the connection hole, and the side wall of the sealing block 303 abuts against the side wall of the connection hole to improve the sealing performance of the sealing block 303. The side wall of the bottom end of the connecting hole is provided with a matching surface matched with the sealing block 303, the matching surface is provided with an O-shaped sealing ring, and the O-shaped sealing ring is used for being abutted against the side wall of the sealing block 303 so as to further improve the sealing performance between the sealing block 303 and the connecting hole.

Preferably, the sealing block 303 may be solid; or the sealing block 303 is hollow to reduce the mass of the sealing block 303 while ensuring that the sealing block 303 has sufficient strength.

in other embodiments, the connecting hole of the stop flange 401 through which the valve rod 30 passes may be triangular, rectangular, or the like; accordingly, the cross-sectional shape of the sealing block 303 is the same as the shape of the connection hole.

preferably, the stop flange 401 is formed with a tapered surface that mates with the sealing block 303. When the sealing block 303 extends into the connecting hole, the side wall of the sealing block 303 abuts against the tapered surface to further increase the contact area between the sealing block 303 and the stop flange 401, and further improve the sealing property between the sealing block 303 and the stop flange 401.

Specifically, the gate valve further comprises a first sealing ring, which is arranged between the bearing 60 and the stop flange 401. The first sealing ring can further prevent oil gas in the valve cavity 101 from entering the bearing hole, and can also prevent lubricating oil or lubricating grease in the bearing hole from flowing into the valve cavity 101.

Specifically, the gate valve further includes a second sealing ring disposed between the cover plate 50 and the valve cover 40. So as to prevent the lubricating oil or grease in the bearing hole from escaping from the gap between the cover plate 50 and the valve cover 40, and prevent external rainwater from entering the bearing hole through the gap between the cover plate 50 and the valve cover 40.

Specifically, the valve stem 30 includes a first section connected to the valve cover 40 and a second section connected to the valve plate 20; be provided with the drive external screw thread on the first section, inside is provided with the drive screw hole on the second section, and the drive external screw thread cooperates with the drive screw hole. When the second section is broken due to corrosion, only the second section needs to be replaced, and all the valve rods 30 do not need to be replaced, so that material waste is reduced.

Preferably, the second segment may be connected to the valve plate 20 by welding or bolting, or the second segment may be integrally formed with the valve plate 20 by casting; certainly, a sliding block can also be arranged at the bottom end of the second section, a sliding groove matched with the sliding block is correspondingly arranged at the top end of the valve plate 20, and the sliding block is arranged in the sliding groove in a sliding manner so as to realize the connection between the second section and the valve plate 20.

Specifically, the gate valve further includes a driving portion, and the driving portion is in transmission connection with the top end of the valve rod 30. The driving part drives the valve rod 30 to rotate, and the operation is simple.

The driving part in this embodiment can be various, for example: the driving part can comprise a driving motor, the driving motor is connected with the valve cover 40, a main shaft of the driving motor can be connected with the top end of the valve rod 30 through a coupler, the driving motor drives the valve rod 30 to rotate, and the operation is convenient and labor-saving; preferably, in order to avoid an excessively high rotation speed of the drive motor, which in turn leads to an excessively high rotation speed of the valve stem 30; a first gear may be provided at the top end of the valve rod 30, a second gear may be provided on the main shaft of the driving motor, the first gear is engaged with the second gear, the number of teeth of the first gear is set to be greater than the number of teeth of the second gear, and the rotational speed of the first gear is made to be less than the rotational speed of the second gear; or a first belt wheel is arranged at the top end of the valve rod 30, a second belt wheel is correspondingly arranged on a main shaft of the driving motor, and the first belt wheel and the second belt wheel are connected through a transmission belt, so that the diameter of the first belt wheel is larger than that of the second belt wheel, and the rotating speed of the first belt wheel can be reduced on the premise of ensuring that the rotating speed of the second belt wheel is unchanged. Further preferably, the driving motor can be connected with the control device through a wire, and the control device can be arranged in a control chamber far away from the gate valve, so that the gate valve can be remotely controlled.

Of course, the driving part may further include a driving rod, one end of which may be connected to the top end of the valve rod 30 by welding or bolting, or the driving rod may be integrally formed with the valve rod 30 by casting. The valve rod 30 can be driven to rotate by pushing the driving rod, and the operation is simple.

With continued reference to fig. 5. Preferably, the driving part comprises a driving wheel 70, and the driving wheel 70 is coaxially arranged with the valve rod 30 and is in transmission connection with the valve rod 30. The valve rod 30 is rotated by twisting the driving wheel 70, so that the operation comfort is improved.

FIG. 7 is a schematic structural diagram of a gate valve according to still another embodiment of the present invention; fig. 8 is a partial enlarged view of fig. 7 at D. Please refer to fig. 7 and 8. In other embodiments, the top end of the valve cover 40 extends upwards to form a connecting plate 404, the tail end of the connecting plate 404 is formed with a mounting part, a bearing hole is arranged on the mounting part, and a stuffing box is correspondingly arranged on the valve cover 40 at the bottom end of the connecting plate 404; the stuffing box is a hole with a circular section, the stuffing box is communicated with the valve cavity, the central line of the stuffing box and the central line of the bearing hole are arranged in a collinear way, and the valve rod 30 is arranged in the stuffing box and the bearing hole in a penetrating way; the stop flange 401 is arranged at the bottom end of the stuffing box and protrudes towards the interior of the stuffing box; the second stopper 302 on the valve stem 30 is disposed at a lower portion of the stopper flange 401 so that the second stopper 302 may abut against the stopper flange 401 when the valve stem 30 is broken.

Preferably, a sealing block 303 is disposed between the second stopping portion 302 and the stopping flange 401, two ends of the abutting spring 304 abut against the sealing block 303 and the second stopping portion 302 respectively, and the sealing block 303 can prevent oil gas in the valve cavity from flowing into the stuffing box. The stuffing box is filled with sealing stuffing 402, and the sealing stuffing 402 is used for preventing oil gas in the stuffing box from flowing out of the stuffing box.

The bottom end of the bearing hole is provided with a propping flange 403, and the bearing 60 is placed in the bearing hole from the top end of the bearing hole; the bottom end of the valve rod 30 is connected with the valve plate 20, a movable external thread is arranged on the side wall of the valve rod 30, which is positioned outside the stuffing box, a movable threaded hole is correspondingly arranged on the driving wheel, and the movable external thread is matched with the movable threaded hole; a boss is arranged at the bottom end of the driving wheel 70 and abuts against the top end of the bearing 60; when the driving wheel 70 is rotated, the boss abuts against the bearing 60, and the valve rod 30 is driven to move up and down by moving the external thread and the moving threaded hole, so that the gate valve is opened or closed.

When the valve rod 30 connected to the valve plate 20 is corroded due to contact with impurities in oil gas in the valve cavity 101 and is broken, and the bearing hole is opened to maintain the bearing, the valve rod 30 moves upwards under the action of pressure, so that the second stopping portion 302 abuts against the stopping flange 401 through the abutting spring 304 and the sealing block 303, and the valve rod 30 is prevented from flying out of the bearing hole, and an operator is prevented from being injured and oil gas leaks.

in the present invention, unless otherwise specifically stated, the terms "mounted," "connected," "fixed," and the like are to be understood broadly, and for example, may be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, or communicable with each other; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected internally or in any other manner known to those skilled in the art, unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.