阅读说明：本技术 一种石油管道用阀门 (Valve for petroleum pipeline ) 是由 王鑫 于 2019-12-10 设计创作，主要内容包括：本发明涉及阀门技术领域,具体涉及一种石油管道用阀门,该石油管道用阀门包括阀体、阀芯、阀杆、密封圈和阀盖；所述阀芯安装在阀体内,阀芯的顶部连接有阀杆；所述阀盖通过螺栓固连在阀体上：所述阀杆贯穿于阀盖的内外,阀杆与阀盖之间通过螺纹连接；由于石油管道破损后会有杂物混入,阀门关闭过程中会产生水锤效应,二者对阀芯造成磨损破坏,降低了阀门的使用寿命；故此,本发明通过设置的护板连接在阀芯两侧,底座高于阀体的管道内壁,使得石油管道中流动的杂物和产生的水锤效应都作用在护板上,凸起的底座阻隔杂物的继续流动,使杂物不会滞留于阀芯与阀体之间,保护了阀芯不受破坏,提高了阀门的使用寿命。(The invention relates to the technical field of valves, in particular to a valve for a petroleum pipeline, which comprises a valve body, a valve core, a valve rod, a sealing ring and a valve cover; the valve core is arranged in the valve body, and the top of the valve core is connected with a valve rod; the valve cover is fixedly connected to the valve body through bolts: the valve rod penetrates through the inner part and the outer part of the valve cover, and the valve rod is connected with the valve cover through threads; as sundries are mixed after the petroleum pipeline is damaged, a water hammer effect can be generated in the closing process of the valve, the valve core is abraded and damaged by the sundries and the valve core, and the service life of the valve is shortened; therefore, the guard plates are connected to two sides of the valve core, the base is higher than the inner wall of the pipeline of the valve body, so that sundries flowing in the petroleum pipeline and a water hammer effect generated by the sundries act on the guard plates, the raised base blocks the sundries from continuously flowing, the sundries are prevented from being retained between the valve core and the valve body, the valve core is protected from being damaged, and the service life of the valve is prolonged.)

1. A valve for a petroleum pipeline comprises a valve body (1), a valve core (2), a valve rod (3), a sealing ring (4) and a valve cover (5), wherein the valve core (2) is installed in the valve body (1), and the top of the valve core (2) is connected with the valve rod (3); the valve cover (5) is fixedly connected to the valve body (1): the valve rod (3) penetrates through the inside and the outside of the valve cover (5), the valve rod (3) is connected with the valve cover (5) through threads, and the valve rod (3) generates feeding movement when rotating to drive the valve core (2) to move in the valve body (1) so as to achieve the closing and opening effects; a sealing ring (4) is arranged at the joint of the valve core (2) and the valve body (1); the method is characterized in that: the valve core (2) is a cylinder, and the upper plane and the lower plane of the cylinder of the valve core (2) are perpendicular to the axial direction of the pipeline of the valve body (1); the upper plane and the lower plane of the cylinder are two sides of the valve core (2); a pair of guard plates (6) is arranged on two sides of the valve core (2); the protective plate (6) is distributed symmetrically to the valve core (2), one end of the protective plate (6) is connected to the bottom of the valve core (2), and the other end of the protective plate is connected to the inner wall of the upper side of the pipeline of the valve body (1); when the valve is opened, the guard plate (6) is parallel to the axial position of the pipeline of the valve body (1); when the valve is closed, the guard plate (6) moves to a position vertical to the axial direction of the pipeline of the valve body (1); a base (7) is arranged at the bottom in the pipeline of the valve body (1), the base (7) is positioned below the valve core (2), and the base (7) is higher than the inner wall of the pipeline of the valve body (1); when the valve is closed, the bottom of the valve core (2) is attached to the base (7).

2. The valve for the petroleum pipeline of claim 1, wherein: the guard plate (6) is hinged to the bottom end of the side surface of the valve core (2) and the inner wall of the pipeline of the valve body (1); the pipeline protection device is characterized in that a pair of sliding rails (61) are arranged on the inner wall of the upper side of the pipeline of the valve body (1), the sliding rails (61) are arranged along the axial direction of the pipeline of the valve body (1), the sliding rails (61) are symmetrically distributed relative to the valve core (2), one end of the protection plate (6) is hinged to the sliding block (62), and the sliding block (62) is connected in the sliding rails (61) in a sliding mode.

3. A valve for a petroleum pipeline as defined in claim 2, wherein: the protective plate (6) is in a round cake shape, the middle of the protective plate (6) is slightly raised, when the protective plate (6) is perpendicular to the axial position of the pipeline of the valve body (1), the protective plate (6) plays a preliminary intercepting role in the pipeline of the valve body (1), and the raised direction of the protective plate (6) faces to one side far away from the valve core (2).

4. The valve for the petroleum pipeline of claim 1, wherein: an elastic rubber pad (71) is arranged in the base (7); the elastic rubber cushion (71) is fixed at the bottom end of the base (7); the middle of the bottom surface of the valve core (2) is raised, and the middle of the base (7) is depressed; when the valve is closed, the elastic rubber pad (71) is extruded by the valve core (2), the elastic rubber pad (71) is extruded out along the joint of the valve core (2) and the base (7), and the bulge in the middle of the valve core (2) is attached to the depression in the middle of the base (7) through the extrusion of the elastic rubber pad (71).

5. The valve for the petroleum pipeline of claim 4, wherein: the elastic rubber pad (71) is fixed at the bottom of the base (72); notches are formed in the bottom of the valve body (1) and the middle of the base (7); the base (72) is fixed on the valve body (1) through a bolt, and an elastic rubber pad (71) on the bottom of the base (72) extends into the base (7) from the notch.

6. The valve for the petroleum pipeline of claim 1, wherein: the sealing ring (4) comprises a first seal (41) on the valve body (1) and a second seal (42) on the valve core (2); the first seal (41) is in contact with two side faces of the valve core (2); the second seal (42) is arranged in the middle of the circular section of the valve core (2).

Technical Field

The invention relates to the technical field of valves, in particular to a valve for a petroleum pipeline.

Background

The tubular product of petroleum pipeline generally is the steel pipe, use connecting device such as welding and flange to connect into long distance pipeline, and use the valve to carry out switching control and flow control, the valve is the mechanical device that is used for opening, closing or control pipeline inner medium flow, the kind of valve is numerous, common shut-off valve has the gate valve, the stop valve, ball valve and butterfly valve etc., in long distance pipeline's laying, must install the valve along the line, the setting position of shut-off valve should not be influenced by geological disasters and flood, and will satisfy the convenient needs of maintenance, and establish protection facilities.

As one of main petroleum origins, the middle east area has a complex local environment, petroleum pipelines are often damaged by human factors, and certain problems exist after the pipelines are controlled to close a valve to stop conveying petroleum: broken pipeline fragments and other impurities are mixed into the petroleum pipeline and pass through a valve in the pipeline along with the conveying of petroleum, so that the valve core of the valve is abraded and damaged, the closing effect of the valve is influenced, and the service life of the valve is shortened; in the closing process of the valve in the pipeline, a water hammer effect can be generated, severe impact is caused on the valve core, and the service life of the valve is shortened.

In view of this, in order to overcome the above technical problems, the present company has designed and developed a valve for petroleum pipelines, which adopts a special valve core structure to solve the above technical problems.

Disclosure of Invention

In order to make up the defects of the prior art, the valve for the petroleum pipeline, which is provided by the invention, has the advantages that the valve core is protected from being collided and damaged by sundries mixed in the petroleum pipeline through the guard plates arranged on the two sides of the valve core; the guard plate moves along with the movement of the valve core, so that the dynamic change of the posture position of the guard plate avoids the damage of the water hammer effect on the valve core, and the service life of the valve is prolonged.

The invention relates to a valve for a petroleum pipeline, which comprises a valve body, a valve core, a valve rod, a sealing ring and a valve cover; the valve core is arranged in the valve body, and the top of the valve core is connected with a valve rod; the valve cover is fixedly connected to the valve body: the valve rod penetrates through the inside and the outside of the valve cover, the valve rod is connected with the valve cover through threads, and the valve rod generates feeding movement when rotating to drive the valve core to move in the valve body, so that the closing and opening effects are achieved; a sealing ring is arranged at the joint of the valve core and the valve body; the valve core is a cylinder, the upper plane and the lower plane of the cylinder of the valve core are perpendicular to the axial direction of the valve body pipeline, the two sides of the valve core are the upper plane and the lower plane of the cylinder, and the two sides of the valve core are provided with a pair of guard plates; the guard plates are symmetrically distributed on the valve core, one end of each guard plate is connected to the bottom of the valve core, and the other end of each guard plate is connected to the inner wall of the upper side of the valve body pipeline; when the valve is opened, the guard plate is parallel to the axial position of the valve body pipeline; when the valve is closed, the guard plate moves to a position vertical to the axial direction of the valve body pipeline; a base is arranged at the bottom in the valve body pipeline; the base is positioned below the valve core and is higher than the inner wall of the valve body pipeline; when the valve is closed, the bottom of the valve core is attached to the base; when the valve is in work, the valve is closed after the petroleum pipeline is damaged, sundries flowing along with petroleum can collide with the valve core due to the fact that the sundries are mixed after the petroleum pipeline is damaged, when the valve is completely closed, the sundries exist between the valve core and the valve body, the sealing effect of the valve is influenced, meanwhile, the valve core is abraded and damaged due to the water hammer effect generated in the closing process of the valve, and the service life of the valve is shortened; therefore, the valve rod pushes the valve core to move, the guard plate connected to the valve core changes position along with the movement of the valve core, the primary interception effect on fluid in a petroleum pipeline is achieved, the situation that sundries in the petroleum pipeline directly collide with the valve core to cause damage is avoided, after the valve is closed, the valve core moves to an end point, the valve core is attached to the base, the base is higher than the inner wall of the valve body pipeline, the sundries moving at the bottom layer of the fluid in the petroleum pipeline are separated by the raised base, and after the valve is closed, the valve core is attached to the base; the base is higher than the inner wall of the pipeline of the valve body, the guard plate is connected to the outer side of the valve core, so that sundries flowing along with petroleum collide on the guard plate in the closing process of the valve, meanwhile, in the closing process layer of the valve, the dynamic change of the guard plate guides fluid to the lower part of the pipeline of the valve body, the water hammer effect acts on the guard plate, the valve core is protected from being damaged, the raised base blocks the continuous flowing of the sundries, the sundries cannot be retained between the valve core and the valve body, the control effect of the valve is ensured, and the service life of the valve is prolonged.

Preferably, the guard plate is hinged to the bottom end of the side surface of the valve core and the inner wall of the valve body pipeline; a pair of slide rails is arranged on the inner wall of the upper side of the valve body pipeline; the sliding rails are arranged along the axial direction of the valve body pipeline and are symmetrically distributed around the valve core; the slide rail is provided with a slide block in sliding connection; one end of the guard plate is hinged to the sliding block; when the valve works, the guard plate is fixedly arranged at the outer side of the valve core and interferes with the stroke of the valve core, the guard plate is hinged on the valve core and the valve body, the guard plate can deform along with the movement of the valve core, the deformable guard plate is difficult to effectively obstruct the impact of sundries in the fluid of the petroleum pipeline and effectively protects the valve core, the guard plate is made of rigid material, one end of the guard plate is hinged on the sliding block of the sliding rail, along with the movement of the valve core, the guard plate drives the sliding block to move on the sliding rail, the moving posture of the guard plate is limited by the arranged sliding rail, the guard plate tilts in the axial direction of the petroleum pipeline, in the closing process of the valve, the guard plate gradually moves from the horizontal position to the vertical position along with the movement of the valve core, in the moving process of the guard plate, the guide effect of the tilted guard plate on the, the service life of the valve is prolonged.

Preferably, the guard plate is in a round cake shape, the middle part of the guard plate is slightly raised, when the guard plate is perpendicular to the axial position of the valve body pipeline, the guard plate plays a primary intercepting role in the valve body pipeline, and the protrusion of the guard plate faces to one side far away from the valve core; the during operation, in the valve closing process, the fluid has formed the water hammer effect in the petroleum pipeline, the backplate that sets up in the case outside bears the impact of water hammer effect and easily receives the damage, and through setting up the backplate, in the valve closing process, the backplate removes to vertical position from horizontal position along with the removal of case gradually, in the removal in-process of backplate, the water hammer effect is used in the backplate of tilt motion, the destructive effect of water hammer effect in the petroleum pipeline has been reduced, the middle part of backplate is protruding slightly, protruding inflow direction towards the petroleum pipeline in fluid, arched structure has been constituted, do benefit to the reposition of redundant personnel impact force, make the fulcrum of impact force conduction to backplate, the structure of backplate has been protected, the life of valve has been improved.

Preferably, an elastic rubber pad is arranged in the base; the elastic rubber cushion is fixed at the bottom end of the base; the middle of the bottom surface of the valve core is raised, and the middle of the base is depressed; when the valve is closed, the elastic rubber pad is extruded by the valve core, the elastic rubber pad is extruded along the joint of the valve core and the base, and the bulge in the middle of the valve core is attached to the depression in the middle of the base by extruding the elastic rubber pad; when the valve is in operation, the elastic rubber pad arranged on the base is impacted by sundries in the pipeline fluid and is easy to wear, the raised base can prevent most sundries from passing through, tiny sundries are stored in the fluid between the valve core and the base contact surface at the moment of closing the valve, after the valve is closed, the sundries are rolled between the valve core and the base to damage the sealing performance of the valve core and the base, the arranged elastic rubber pad is used as a buffer layer at the moment of closing the valve, the elastic rubber pad is compressed and deformed towards an outer ring by the extrusion generated by the valve core to extrude the sundries remained between the valve core and the base, and meanwhile, after the valve is completely closed, the miniature sundries are embedded into the rubber side wall of the elastic rubber pad by the extrusion of the valve core, so that the surface of the valve core cannot be worn and damaged, the middle part of the base is sunken, and the direct impact of the elastic rubber pad arranged, the middle part arch of case bottom begins at the closed moment of valve to the point contact, has reduced debris and has detained the space between case and the base contact surface, through extrusion elastic rubber mat with the base laminating gradually, does benefit to elastic rubber mat's deformation, extrudes the debris of reseing between the contact surface, has improved the life of valve.

Preferably, the elastic rubber pad is fixed at the bottom of the base; notches are formed in the bottom of the valve body and the middle of the base; the base is fixed on the valve body through a bolt, and the elastic rubber pad on the bottom of the base extends into the base from the notch; when the valve body works, the elastic rubber pad is used as a buffer layer between the valve core and the base to protect the contact surface between the valve core and the base from being damaged by the abrasion of sundries, and meanwhile, the elastic rubber pad is gradually damaged by the abrasion of the sundries, so that the subsequent sealing protection effect is reduced, and the elastic rubber pad is arranged in the valve body and is difficult to replace; the base through setting up is installed on the valve body, and the elastic rubber pad after wearing and tearing reaches the purpose of changing through the dismouting base, does benefit to the maintenance, has improved the life of valve.

Preferably, the sealing rings comprise a first sealing on the valve body and a second sealing on the valve core; the first seal is contacted with two side surfaces of the valve core; the second seal is arranged in the middle of the circular section of the valve core; during operation, in the process of moving the cylindrical valve core, the contact surface of the valve core and the valve body is changed, a seal which is independently arranged on the valve body cannot play a whole sealing effect, a second seal is arranged on the maximum diameter of the valve core and is in sliding contact with the inner wall of the valve body pipeline along with the movement of the valve core, and the sealing effect of the valve body pipeline is kept in the opening and closing process of the valve.

The invention has the following beneficial effects:

1. according to the invention, through the guard plates arranged on the two sides of the valve core, sundries flowing along with petroleum collide on the guard plates in the closing process of the valve, so that the collision damage to the surface of the valve core is avoided, and meanwhile, in the closing process layer of the valve, the change of the inclined motion of the guard plates guides fluid to the lower part of a valve body pipeline, so that the water hammer effect acts on the guard plates, the valve core is protected from being damaged, and the service life of the valve is prolonged.

2. According to the invention, through the base arranged on the valve body, the convex base is utilized to block the continuous flow of the sundries, so that the sundries are not retained between the valve core and the valve body, and the control effect of the valve is ensured; the base middle part of setting is sunken, has reduced the elastic rubber pad of installing in the base and has received the direct impact of debris in the pipeline fluid, and the bottom middle part arch that sets up the case is in the closed moment of valve to the point contact begins, does benefit to the deformation of elastic rubber pad, extrudes and stays the debris that exist in the contact surface, has improved the life of valve.

3. According to the invention, through the elastic rubber pad arranged on the base, the elastic rubber pad is compressed and deformed towards the outer ring by utilizing the extrusion generated by the valve core, sundries remained between the valve core and the base are extruded out, and meanwhile, after the valve is completely closed, miniature sundries are embedded into the rubber side wall of the elastic rubber pad by the extrusion of the valve core, so that the surface of the valve core is not abraded and damaged, and meanwhile, the sealing effect is achieved.

Drawings

The invention is further described with reference to the following figures and embodiments.

FIG. 1 is a schematic view of a valve according to the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is an enlarged view at B in FIG. 1;

FIG. 4 is a schematic view of the operation of the valve of the present invention;

in the figure: the valve comprises a valve body 1, a valve core 2, a valve rod 3, a sealing ring 4, a first seal 41, a second seal 42, a valve cover 5, a protective plate 6, a slide rail 61, a slide block 62, a base 7, an elastic rubber pad 71 and a base 72.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 4, the valve for the petroleum pipeline according to the present invention comprises a valve body 1, a valve core 2, a valve rod 3, a sealing ring 4 and a valve cover 5; the valve core 2 is arranged in the valve body 1, and the top of the valve core 2 is connected with a valve rod 3; the valve cover 5 is fixedly connected on the valve body 1: the valve rod 3 penetrates through the valve cover 5, the valve rod 3 is connected with the valve cover 5 through threads, and the valve core 2 is driven to move in the valve body 1 by the feeding movement generated when the valve rod 3 rotates, so that the closing and opening effects are achieved; a sealing ring 4 is arranged at the joint of the valve core 2 and the valve body 1; the valve core 2 is a cylinder, the upper plane and the lower plane of the cylinder of the valve core 2 are perpendicular to the axial direction of the pipeline of the valve body 1, the two sides of the valve core 2 are the upper plane and the lower plane of the cylinder, and the two sides of the valve core 2 are provided with a pair of guard plates 6; the guard plate 6 is symmetrically distributed on the valve core 2, one end of the guard plate 6 is connected to the bottom of the valve core 2, and the other end of the guard plate 6 is connected to the inner wall of the upper side of the pipeline of the valve body 1; when the valve is opened, the guard plate 6 is parallel to the axial position of the pipeline of the valve body 1; when the valve is closed, the guard plate 6 moves to a position vertical to the axial direction of the pipeline of the valve body 1; a base 7 is arranged at the bottom in the pipeline of the valve body 1; the base 7 is positioned below the valve core 2, and the base 7 is higher than the inner wall of the pipeline of the valve body 1; when the valve is closed, the bottom of the valve core 2 is attached to the base 7; when the valve is in operation, after the petroleum pipeline is damaged, the valve is closed, sundries flowing along with petroleum can collide with the valve core 2 due to the fact that the sundries are mixed after the petroleum pipeline is damaged, when the valve is completely closed, the sundries exist between the valve core 2 and the valve body 1, the sealing effect of the valve is influenced, meanwhile, the valve core 2 is also abraded and damaged due to the water hammer effect generated in the closing process of the valve, and the service life of the valve is shortened; therefore, the valve rod 3 pushes the valve core 2 to move, the guard plate 6 connected to the valve core 2 changes position along with the movement of the valve core 2, an effect of primary interception is achieved on fluid in a petroleum pipeline, damage caused by direct collision of sundries in the petroleum pipeline on the valve core 2 is avoided, after the valve is closed, the valve core 2 moves to an end point, the valve core 2 is attached to the base 7, the base 7 is higher than the inner wall of the pipeline of the valve body 1, so that sundries moving at the bottom layer of the fluid in the petroleum pipeline are blocked by the raised base 7, and after the valve is closed, the valve core 2 is attached to the base 7; according to the invention, the base 7 is higher than the inner wall of the pipeline of the valve body 1, the guard plate 6 is connected to the outer side of the valve core 2, so that sundries flowing along with petroleum collide on the guard plate 6 in the closing process of the valve, meanwhile, in the closing process of the valve, the dynamic change of the guard plate 6 guides fluid to the lower part of the pipeline of the valve body 1, the water hammer effect acts on the guard plate 6, the valve core 2 is protected from being damaged, the raised base 7 blocks the continuous flow of the sundries, the sundries are prevented from being retained between the valve core 2 and the valve body 1, the control effect of the valve is ensured, and the service life of the valve is prolonged.

As an embodiment of the invention, the guard plate 6 is hinged on the bottom end of the side surface of the valve core 2 and the inner wall of the pipeline of the valve body 1; a pair of slide rails 61 are arranged on the inner wall of the upper side of the pipeline of the valve body 1; the slide rail 61 is arranged along the axial direction of the pipeline of the valve body 1, and the slide rail 61 is symmetrically distributed around the valve core 2; a sliding block 62 in sliding connection is arranged on the sliding rail 61; one end of the guard plate 6 is hinged on the sliding block 62; when in work, the guard plate 6 is fixedly arranged on the outer side of the valve core 2 to interfere the stroke of the valve core 2,

the guard plate 6 is hinged on the valve core 2 and the valve body 1, the guard plate 6 can deform along with the movement of the valve core 2, the deformable guard plate 6 is difficult to effectively obstruct the impact of sundries in the fluid of the petroleum pipeline and effectively protect the valve core 2, the arranged guard plate 6 is made of rigid material, one end of the guard plate 6 is hinged on the sliding block 62 of the sliding rail 61, along with the movement of the valve core 2, the guard plate 6 drives the sliding block 62 to move on the sliding rail 61, the moving posture of the guard plate 6 is limited by the arranged sliding rail 61, the guard plate 6 tilts in the axial direction of the petroleum pipeline, in the closing process of the valve, the guard plate 6 gradually moves from the horizontal position to the vertical position along with the movement of the valve core 2, in the moving process of the guard plate 6, the tilted guard plate 6 plays a flow guide effect on the fluid in the petroleum pipeline, and avoids the damage caused by the, the service life of the valve is prolonged.

As an embodiment of the invention, the guard plate 6 is in a round cake shape, the middle part of the guard plate 6 is slightly convex, when the guard plate 6 is perpendicular to the axial position of the pipeline of the valve body 1, the guard plate 6 plays a primary role in intercepting in the pipeline of the valve body 1, and the convex part of the guard plate 6 faces to the side far away from the valve core 2; during operation, in the valve closing process, the fluid has formed the water hammer effect in the petroleum pipeline, backplate 6 that sets up in the case 2 outside bears the impact of water hammer effect and easily receives the damage, and through setting up backplate 6, in the valve closing process, the backplate removes to vertical position from horizontal position gradually along with the removal of case, in the removal in-process of backplate, the water hammer effect is used in the backplate of tilt motion, the destructive effect of water hammer effect in the petroleum pipeline has been reduced, the middle part of backplate 6 is protruding slightly, protruding orientation towards the fluidic inflow direction in the petroleum pipeline, arched structure has been constituted, do benefit to the reposition of redundant personnel impact force, make the fulcrum of impact force conduction to backplate 6, the structure of backplate 6 has been protected, the life of valve has been improved.

As an embodiment of the present invention, an elastic rubber pad 71 is disposed in the base 7; the elastic rubber pad 71 is fixed at the bottom end of the base 7; the middle of the bottom surface of the valve core 2 is raised, and the middle of the base 7 is depressed; when the valve is closed, the elastic rubber pad 71 is extruded by the valve core 2, the elastic rubber pad 71 is extruded out along the joint of the valve core 2 and the base 7, and the bulge in the middle of the valve core 2 is attached to the depression in the middle of the base 7 by extruding the elastic rubber pad 71; when the valve works, the elastic rubber pad 71 arranged on the base 7 is impacted by sundries in pipeline fluid and is easy to wear, the raised base 7 can prevent most sundries from passing through, tiny sundries exist in the fluid between the contact surfaces of the valve core 2 and the base 7 at the moment of closing the valve, after the valve is closed, the sundries are rolled between the valve core 2 and the base 7 to damage the sealing performance of the valve core 2 and the base 7, the arranged elastic rubber pad 71 is used as a buffer layer at the moment of closing the valve, the extrusion generated by the valve core 2 enables the elastic rubber pad 71 to compress and deform towards an outer ring to extrude the sundries remained between the valve core 2 and the base 7, and meanwhile, after the valve is completely closed, the miniature sundries are extruded by the valve core 2 and embedded into the rubber side wall of the elastic rubber pad 71, so that the surface of the valve core 2 cannot be worn and damaged, the middle of the base 7 is sunken, and the direct impact of the elastic rubber pad 71 arranged in the base 7 by, the middle part arch of case 2 bottom begins at the closed moment of valve with the point contact, has reduced debris and has detained the space between case 2 and the base 7 contact surface, through extrusion elastic rubber pad 71 with the base 7 laminating gradually, does benefit to elastic rubber pad 71's deformation, extrudes the debris of reserving between the contact surface, has improved the life of valve.

As an embodiment of the present invention, the elastic rubber pad 71 is fixed on the bottom of the base 72; notches are formed in the bottom of the valve body 1 and the middle of the base 7; the base 72 is fixed on the valve body 1 through a bolt, and the elastic rubber pad 71 on the bottom of the base 72 extends into the base 7 from the notch; when the valve body works, the elastic rubber pad 71 serves as a buffer layer between the valve core 2 and the base 7, the contact surface between the valve core 2 and the base 7 is protected from being damaged by abrasion of sundries, meanwhile, the elastic rubber pad 71 is gradually damaged by the abrasion of the sundries, the subsequent sealing protection effect is reduced, and the elastic rubber pad 71 is arranged in the valve body 1 and is difficult to replace; install on valve body 1 through the base 72 that sets up, the elastic rubber pad 71 after wearing and tearing reaches the purpose of changing through dismouting base 72, does benefit to the maintenance, has improved the life of valve.

As an embodiment of the invention, the sealing ring 4 comprises a first seal 41 on the valve body 1 and a second seal 42 on the valve core 2; the first seal 41 is contacted with two side surfaces of the valve core 2; the second seal 42 is arranged in the middle of the circular section of the valve core 2; during operation, in the moving process of the cylindrical valve core 2, the contact surface of the valve core 2 and the valve body 1 is changed, the first seal 41 which is independently arranged on the valve body 1 cannot play a whole sealing effect, the second seal 42 is arranged on the maximum diameter of the valve core 2, the second seal 42 is in sliding contact with the inner wall of the pipeline of the valve body 1 along with the movement of the valve core 2, and the sealing effect of the pipeline of the valve body 1 is kept in the opening and closing process of the valve.

When the valve is in operation, a petroleum pipeline is damaged, the valve rod 3 pushes the valve core 2 to move, the protective plate 6 connected to the valve core 2 changes position along with the movement of the valve core 2, when the valve is closed, the protective plate 6 in inclined motion plays a role in primary interception of fluid in the petroleum pipeline, damage caused by direct collision of sundries in the petroleum pipeline with the valve core 2 is avoided, meanwhile, after the valve is closed, the valve core 2 moves to an end point, the valve core 2 is attached to the base 7, the base 7 is higher than the inner wall of the pipeline of the valve body 1, so that sundries mixed in the petroleum pipeline and moving at the bottom of the fluid are separated by the raised base 7, the middle part of the protective plate 6 is raised towards the inflow direction of the fluid in the petroleum pipeline, the impact force of the fluid in the petroleum pipeline is favorably born, the protective plate 6 is hinged to the valve core 2 and the valve body 1, along, the middle part of the cake-shaped guard plate 6 is slightly raised to form an arched structure, which is beneficial to shunting impact force, so that the impact force is transmitted to the fulcrum of the guard plate 6, the structure of the guard plate 6 is protected, the elastic rubber pad 71 is used as a buffer layer at the moment of closing the valve, the extrusion generated by the valve core 2 causes the elastic rubber pad 71 to be compressed and deformed towards the outer ring, meanwhile, sundries remained between the valve core 2 and the base 7 are extruded out, after the valve is completely closed, miniature sundries are extruded by the valve core 2 and embedded into the rubber side wall of the elastic rubber pad 71, so that the surface of the valve core 2 cannot be abraded and damaged, the middle part of the base 7 is sunken, the direct impact of the rubber pad arranged in the base 7 by sundries in pipeline fluid is reduced, the middle part of the bottom of the valve core 2 is raised at the moment of closing the valve by point contact, the space where the sundries remained between the contact surface of the valve, do benefit to the deformation of elastic rubber pad 71 and extrude the debris of surviving in the contact surface, the base 72 of setting is installed on valve body 1, and elastic rubber pad 71 after wearing and tearing reaches the purpose of changing through dismouting base 72, does benefit to the maintenance, has improved the life of valve jointly.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.