阅读说明：本技术 一种便于维护的球阀 (Ball valve convenient to maintain ) 是由 何浩南 于 2020-06-22 设计创作，主要内容包括：本发明公开了一种便于维护的球阀,涉及球阀技术领域,包括一个阀座、一个可拆卸的阀体和两个端管；所述阀座内设有一上端敞口的阀体容置腔,所述阀体容置腔呈圆柱状,阀座的侧壁上开设有两个与阀体容置腔连通的端管连接孔,两个端管均定位在阀座的外侧壁上,两个端管与两个端管连接孔一一对应并连通；所述阀体容置腔内同轴嵌设有一定位套,定位套的侧壁上开设有两个第一连通孔,两个第一连通孔与两个端管连接孔一一对应并连通；所述阀体插接在定位套内,阀体包括一个滑动套、一个阀球座、一个阀球、两个阀球定位环和一个阀杆。本发明为了解决现有运行管网中球阀拆卸、更换较为不便的问题,提出一种运行管网中拆卸、更换较为方便的球阀。(The invention discloses a ball valve convenient to maintain, which relates to the technical field of ball valves and comprises a valve seat, a detachable valve body and two end pipes; a valve body accommodating cavity with an opening at the upper end is arranged in the valve seat, the valve body accommodating cavity is cylindrical, two end pipe connecting holes communicated with the valve body accommodating cavity are formed in the side wall of the valve seat, the two end pipes are positioned on the outer side wall of the valve seat, and the two end pipes are in one-to-one correspondence with and communicated with the two end pipe connecting holes; a positioning sleeve is coaxially embedded in the valve body accommodating cavity, two first connecting holes are formed in the side wall of the positioning sleeve, and the two first connecting holes are in one-to-one correspondence with and communicated with the two end pipe connecting holes; the valve body is inserted in the positioning sleeve and comprises a sliding sleeve, a valve ball seat, a valve ball, two valve ball positioning rings and a valve rod. The invention provides a ball valve which is convenient to disassemble and replace in an operation pipe network, and aims to solve the problem that the ball valve in the existing operation pipe network is inconvenient to disassemble and replace.)

1. The utility model provides a ball valve convenient to maintain which characterized in that: comprises a valve seat (1), a detachable valve body (2) and two end pipes (3);

a valve body accommodating cavity (101) with an open upper end is arranged in the valve seat (1), the valve body accommodating cavity (101) is cylindrical, the central axis of the valve body accommodating cavity (101) is vertical, two end pipe connecting holes (102) communicated with the valve body accommodating cavity (101) are formed in the side wall of the valve seat (1), the two end pipe connecting holes (102) are arranged oppositely, two end pipes (3) are positioned on the outer side wall of the valve seat (1), and the two end pipes (3) are in one-to-one correspondence with and communicated with the two end pipe connecting holes (102); a positioning sleeve (103) is coaxially embedded in the valve body accommodating cavity (101), two first connecting holes (104) are formed in the side wall of the positioning sleeve (103), and the two first connecting holes (104) are in one-to-one correspondence with and communicated with the two end pipe connecting holes (102);

the valve body (2) is inserted into the positioning sleeve (103), the valve body (2) comprises a sliding sleeve (201), a valve ball seat (202), a valve ball (203), two valve ball positioning rings (204) and a valve rod (4), the sliding sleeve (201) is tubular, the outer diameter of the sliding sleeve (201) is matched with the inner diameter of the positioning sleeve (103), the sliding sleeve (201) is arranged in the positioning sleeve (103), and the sliding sleeve (201) is in sliding sealing fit with the positioning sleeve (103); the valve ball seat (202), the valve ball (203) and the valve ball positioning ring (204) are arranged in the sliding sleeve (201), the valve ball seat (202) is fixed with the inner wall of the sliding sleeve (201) in a sealing mode, a valve ball positioning hole (205) transversely penetrates through the valve ball seat (202), two second communication holes (206) are formed in the side wall of the sliding sleeve (201), the inner sides of the two second communication holes (206) are in one-to-one correspondence with and communicated with the two ends of the valve ball positioning hole (205), and the outer sides of the two second communication holes (206) are in one-to-one correspondence with and communicated with the two first communication holes (104); valve ball (203) and valve ball holding ring (204) all locate in valve ball locating hole (205), and valve ball (203) both sides are located respectively in two valve ball holding rings (204), and valve ball (203) press from both sides tight location through two valve ball holding rings (204), are located and have seted up a first valve rod locating hole (207) on valve ball seat (202) of valve ball (203) upside, valve rod (4) one end is located first valve rod locating hole (207) outside, the other end passes first valve rod locating hole (207) and is connected with valve ball (203), is sealed normal running fit between valve rod (4) and first valve rod locating hole (207).

2. A service-friendly ball valve as claimed in claim 1, wherein: be equipped with a valve body holding ring (5) in valve body holding chamber (101) that is located valve body (2) upside, it is fixed through helicitic texture between valve body holding ring (5) and valve body holding chamber (101), the downside and valve body (2) of valve body holding ring (5) support and lean on.

3. A service-friendly ball valve as claimed in claim 1, wherein: two sealing rings (208) are positioned on the outer side wall of the sliding sleeve (201), the two sealing rings (208) correspond to the two second communication holes (206) one by one, the sealing rings (208) are arranged around the corresponding second communication holes (206), the sealing rings (208) are fixed with the outer wall of the sliding sleeve (201) in a sealing mode, and the sealing rings (208) are matched with the inner wall of the positioning sleeve (103) in a sliding sealing mode.

4. A service-friendly ball valve as claimed in claim 1, wherein: a valve rod positioning seat (6) is arranged on the upper side of the valve ball seat (202), the valve rod positioning seat (6) is fixed with the inner wall of the sliding sleeve (201) in a sealing mode, a constant pressure cavity (7) is formed between the valve rod positioning seat (6) and the valve ball seat (202), a second valve rod positioning hole (601) which penetrates through the valve rod positioning seat up and down is formed in the valve rod positioning seat (6), and the second valve rod positioning hole (601) is located right above the first valve rod positioning hole (207);

the valve rod (4) comprises an upper valve rod (401), a connector (402) and a lower valve rod (403) from top to bottom, a sliding sleeve (8) is coaxially embedded in the second valve stem positioning hole (601), the lower opening of the sliding sleeve (8) is communicated with the constant pressure cavity (7), the connector (402) is arranged in the sliding sleeve (8), the connector (402) is in movable sealing fit with the sliding sleeve (8), an upper valve rod clamping groove (404) is arranged at the upper end of the connector (402), a lower valve rod clamping groove (405) is arranged at the lower end of the connector (402), the upper valve rod (401) is rotatably connected with the second valve rod positioning hole (601), an upper polygonal clamping head (406) matched with the upper valve rod clamping groove (404) is arranged at the lower end of the upper valve rod (401), the lower end of the upper polygonal clamping head (406) extends into the upper valve rod clamping groove (404), and the upper polygonal clamping head (406) is in up-and-down sliding fit with the upper valve rod clamping groove (404); the lower valve rod (403) is rotatably connected with the first valve rod positioning hole (207), the lower end of the lower valve rod (403) is connected with the valve ball (203), the upper end of the lower valve rod (403) is provided with a lower polygonal clamping head (407) matched with the lower valve rod clamping groove (405), when the connector (402) is located at the lowest limit position, the lower polygonal clamping head (407) is connected with the lower valve rod clamping groove (405) in an inserting mode, and when the connector (402) is located at the highest limit position, the lower polygonal clamping head (407) is disconnected with the lower valve rod clamping groove (405); the upper end of the connector (402) is provided with a spring (9) for pressing down the connector (402).

5. A service-friendly ball valve as claimed in claim 4, wherein: the cross section of the upper polygonal clamping head (406) is a regular hexagon, and the cross section of the lower polygonal clamping head (407) is a regular hexagon.

6. A service-friendly ball valve as claimed in claim 4, wherein: an annular flange (602) is arranged at the top of the valve rod positioning seat (6) around the second valve rod positioning hole (601), the top of the annular flange (602) extends inwards to form a first flanging (603), a clamping sleeve (10) is sleeved on the outer side of the annular flange (602), the clamping sleeve (10) and the annular flange (602) are coaxially arranged, the top of the clamping sleeve (10) extends inwards to form a second flanging (1001), and the second flanging (1001) is located on the upper side of the first flanging (603); a convex ring (408) is annularly arranged on the side wall of the upper valve rod (401), and the convex ring (408) is located between the first flanging (603) and the second flanging (1001).

Technical Field

The invention relates to the technical field of ball valves, in particular to a ball valve convenient to maintain.

Background

The ball valve mainly refers to a PE ball valve, namely a polyethylene ball valve, the polyethylene ball valve has the advantages of convenience in installation, strong corrosion resistance and the like, the main material of the polyethylene ball valve is plastic, and when the polyethylene ball valve is in butt joint with a pipeline, the polyethylene ball valve is mainly in butt joint in a hot melting mode. Compared with the thread butt joint, the hot melt butt joint has the defect of difficult disassembly. Therefore, when the ball valve in the running pipe network leaks or is damaged, the replacement is inconvenient.

Disclosure of Invention

The invention provides a ball valve which is convenient to disassemble and replace in an operation pipe network, and aims to solve the problem that the ball valve in the existing operation pipe network is inconvenient to disassemble and replace.

In order to achieve the purpose, the invention adopts the following technical scheme: a ball valve convenient for maintenance comprises a valve seat, a detachable valve body and two end pipes;

a valve body accommodating cavity with an opening at the upper end is arranged in the valve seat, the valve body accommodating cavity is cylindrical, the central axis of the valve body accommodating cavity is in the vertical direction, two end pipe connecting holes communicated with the valve body accommodating cavity are formed in the side wall of the valve seat, the two end pipe connecting holes are arranged oppositely, two end pipes are positioned on the outer side wall of the valve seat, and the two end pipes are in one-to-one correspondence with and communicated with the two end pipe connecting holes; a positioning sleeve is coaxially embedded in the valve body accommodating cavity, two first connecting holes are formed in the side wall of the positioning sleeve, and the two first connecting holes are in one-to-one correspondence with and communicated with the two end pipe connecting holes;

the valve body is inserted in the positioning sleeve, the valve body comprises a sliding sleeve, a valve ball seat, a valve ball, two valve ball positioning rings and a valve rod, the sliding sleeve is tubular, the outer diameter of the sliding sleeve is matched with the inner diameter of the positioning sleeve, the sliding sleeve is arranged in the positioning sleeve, and the sliding sleeve is in sliding seal fit with the positioning sleeve; the valve ball seat, the valve ball and the valve ball positioning ring are all arranged in the sliding sleeve, the valve ball seat is fixed with the inner wall of the sliding sleeve in a sealing manner, a valve ball positioning hole transversely penetrates through the valve ball seat, two second communication holes are formed in the side wall of the sliding sleeve, the inner sides of the two second communication holes are in one-to-one correspondence with and communicated with two ends of the valve ball positioning hole, and the outer sides of the two second communication holes are in one-to-one correspondence with and communicated with the two first communication holes; the valve ball and the valve ball positioning rings are arranged in the valve ball positioning holes, the two valve ball positioning rings are arranged on two sides of the valve ball respectively, the valve ball is clamped and positioned through the two valve ball positioning rings, a first valve rod positioning hole is formed in the valve ball seat on the upper side of the valve ball, one end of the valve rod is located on the outer side of the first valve rod positioning hole, the other end of the valve rod penetrates through the first valve rod positioning hole and is connected with the valve ball, and the valve rod and the first valve rod positioning hole are in sealing rotation fit.

Preferably, a valve body positioning ring is arranged in the valve body accommodating cavity on the upper side of the valve body, the valve body positioning ring is fixed with the valve body accommodating cavity through a threaded structure, and the lower side of the valve body positioning ring is abutted to the valve body.

Preferably, two sealing rings are positioned on the outer side wall of the sliding sleeve and correspond to the two second communication holes one by one, the sealing rings are arranged around the corresponding second communication holes, the sealing rings and the outer wall of the sliding sleeve are fixed in a sealing mode, and the sealing rings and the inner wall of the positioning sleeve are matched in a sliding sealing mode.

Preferably, a valve rod positioning seat is arranged on the upper side of the valve rod seat, the valve rod positioning seat is fixed with the inner wall of the sliding sleeve in a sealing mode, a constant-pressure cavity is formed between the valve rod positioning seat and the valve rod seat, a second valve rod positioning hole penetrating through the valve rod positioning seat from top to bottom is formed in the valve rod positioning seat, and the second valve rod positioning hole is located right above the first valve rod positioning hole;

the valve rod comprises an upper valve rod, a connector and a lower valve rod from top to bottom, a sliding sleeve is coaxially embedded in the second valve rod positioning hole, the lower opening of the sliding sleeve is communicated with the constant-pressure cavity, the connector is arranged in the sliding sleeve, the connector and the sliding sleeve are in movable sealing fit, an upper valve rod clamping groove is formed in the upper end of the connector, a lower valve rod clamping groove is formed in the lower end of the connector, the upper valve rod is rotatably connected with the second valve rod positioning hole, an upper polygonal clamping head matched with the upper valve rod clamping groove is arranged at the lower end of the upper valve rod, the lower end of the upper polygonal clamping head extends into the upper valve rod clamping groove, and the upper polygonal clamping head and the upper valve rod clamping groove are in vertical sliding fit; the lower valve rod is rotatably connected with the first valve rod positioning hole, the lower end of the lower valve rod is connected with the valve ball, the upper end of the lower valve rod is provided with a lower polygonal clamping head matched with the lower valve rod clamping groove, when the connector is located at the lowest limit position, the lower polygonal clamping head is connected with the lower valve rod clamping groove in an inserting mode, and when the connector is located at the highest limit position, the lower polygonal clamping head is disconnected with the lower valve rod clamping groove; the upper end of the connector is provided with a spring for pressing the connector down.

Preferably, the cross section of the upper polygonal chuck is a regular hexagon, and the cross section of the lower polygonal chuck is a regular hexagon.

Preferably, the top of the valve rod positioning seat is provided with an annular flange around the second valve rod positioning hole, the top of the annular flange extends inwards to form a first flanging, the outer side of the annular flange is sleeved with a clamping sleeve, the clamping sleeve and the annular flange are coaxially arranged, the top of the clamping sleeve extends inwards to form a second flanging, and the second flanging is positioned on the upper side of the first flanging; the side wall of the upper valve rod is annularly provided with a convex ring, and the convex ring is positioned between the first flanging and the second flanging.

Therefore, the invention has the following beneficial effects: 1. the valve seat and the valve body are made to be detachable, the positions of the common ball valve where leakage occurs are the valve ball position and the valve rod position, the valve ball and the valve rod are integrated in the valve body, the positions where leakage easily occurs are all arranged in the valve body convenient to detach, when leakage occurs in the ball valve, a welded pipe network does not need to be detached, only the valve body needs to be replaced, construction is convenient, and maintenance cost of the pipe network is greatly reduced; 2. set up a valve rod leakage monitoring mechanism in valve rod department, designed into the syllogic with the valve rod, go up valve rod, connector and lower valve rod promptly, when valve rod department takes place to leak, atmospheric pressure in the constant pressure cavity just can rise the drive connector and shift up, finally makes to break away from between connector and the lower valve rod, can play and remind operating personnel valve rod department to take place the condition of leaking, can effectively prevent when the ball valve from leaking again, operating personnel opens and close the operation to the PE ball valve again.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is an exploded view of the present invention.

Fig. 3 is a cross-sectional view of the present invention.

Fig. 4 is a cross-sectional view of a valve seat and end tube of the present invention.

Fig. 5 is a sectional view of the valve body of the present invention.

Fig. 6 is an enlarged view at a in fig. 5.

Fig. 7 is an exploded view of the valve stem of the present invention.

Fig. 8 is an exploded view of another angle of the valve stem of the present invention.

Fig. 9 is an enlarged view of a portion of the present invention where leakage occurs at the valve stem.

1: a valve seat; 101: a valve body; 102: an end tube connection hole; 103: a positioning sleeve; 104: a first communication hole; 2: a valve body; 201: a sliding sleeve; 202: a valve ball seat; 203: a valve ball; 204: a valve ball positioning ring; 205: a valve ball positioning hole; 206: a second communication hole; 207: a first valve stem positioning hole; 3: an end tube; 4: a valve stem; 401: an upper valve stem; 402: a connector; 403: a lower valve stem; 404: an upper valve rod clamping groove; 405: a lower valve rod clamping groove; 406: a polygonal clamping head is arranged; 407: a lower polygonal chuck; 408: a convex ring; 5: a valve body positioning ring; 6: a valve rod positioning seat; 601: a second valve stem positioning hole; 602: an annular flange; 603: a first flanging; 7: a constant pressure cavity; 8: a sliding sleeve; 9: a spring; 10: a card sleeve; 1001: and a second flanging.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 9, a ball valve for easy maintenance includes a valve seat 1, a detachable valve body 2 and two end pipes 3.

A valve body accommodating cavity 101 with an open upper end is arranged in the valve seat 1, the valve body accommodating cavity 101 is cylindrical, the central axis of the valve body accommodating cavity 101 is vertical, two end pipe connecting holes 102 communicated with the valve body accommodating cavity 101 are formed in the side wall of the valve seat 1, the two end pipe connecting holes 102 are arranged oppositely, two end pipes 3 are positioned on the outer side wall of the valve seat 1, and the two end pipes 3 are in one-to-one correspondence with and communicated with the two end pipe connecting holes 102; a positioning sleeve 103 is coaxially embedded in the valve body accommodating cavity 101, the positioning sleeve 103 is made of metal, the inner wall of the positioning sleeve 103 is smooth, two first through holes 104 are formed in the side wall of the positioning sleeve 103, and the two first through holes 104 are in one-to-one correspondence with and communicated with the two end pipe connecting holes 102, as shown in fig. 3 and 4.

The valve body 2 is inserted in the locating sleeve 103, and the valve body 2 comprises a sliding sleeve 201, a valve ball seat 202, a valve ball 203, two valve ball locating rings 204 and a valve rod 4, the sliding sleeve 201 is matched with the inner diameter of the locating sleeve 103 in the tubular and sliding sleeve 201 outer diameter, the sliding sleeve 201 is made of metal materials and smooth in outer wall, the sliding sleeve 201 is arranged in the locating sleeve 103 and matched with the locating sleeve 103 in a sliding sealing mode between the sliding sleeve 201 and the locating sleeve 103, and the specific structure is as follows: two sealing rings 208 are positioned on the outer side wall of the sliding sleeve 201, the two sealing rings 208 correspond to the two second communication holes 206 one by one, the sealing rings 208 are arranged around the corresponding second communication holes 206, the sealing rings 208 and the outer wall of the sliding sleeve 201 are fixed in a sealing mode, and the sealing rings 208 and the inner wall of the positioning sleeve 103 are matched in a sliding sealing mode. The valve ball seat 202, the valve ball 203 and the valve ball positioning ring 204 are all arranged in the sliding sleeve 201, the valve ball seat 202 is fixed with the inner wall of the sliding sleeve 201 in a sealing manner, a valve ball positioning hole 205 is transversely arranged in the valve ball seat 202 in a penetrating manner, two second communication holes 206 are arranged on the side wall of the sliding sleeve 201, the inner sides of the two second communication holes 206 are in one-to-one correspondence and communication with two ends of the valve ball positioning hole 205, and the outer sides of the two second communication holes 206 are in one-to-one correspondence and communication with the two first communication holes 104; the valve ball 203 and the valve ball positioning ring 204 are both arranged in the valve ball positioning hole 205, the two valve ball positioning rings 204 are respectively arranged at two sides of the valve ball 203, the valve ball 203 is clamped and positioned by the two valve ball positioning rings 204, and one side of the valve ball positioning ring 204, which faces the lower valve ball 203, is provided with a sealing ring. A first valve rod positioning hole 207 is formed in the valve ball seat 202 located on the upper side of the valve ball 203, one end of the valve rod 4 is located outside the first valve rod positioning hole 207, the other end of the valve rod 4 penetrates through the first valve rod positioning hole 207 and is connected with the valve ball 203, and the valve rod 4 and the first valve rod positioning hole 207 are in sealing rotation fit.

Be equipped with a valve body holding ring 5 in the valve body holding chamber 101 that is located 2 upsides of valve body, it is fixed through helicitic texture between valve body holding ring 5 and the valve body holding chamber 101, the downside and the valve body 2 of valve body holding ring 5 support and lean on.

A valve rod positioning seat 6 is arranged on the upper side of the valve rod seat 202, the valve rod positioning seat 6 is fixed with the inner wall of the sliding sleeve 201 in a sealing mode, a constant pressure cavity 7 is formed between the valve rod positioning seat 6 and the valve rod seat 202, a second valve rod positioning hole 601 which penetrates through the valve rod positioning seat 6 from top to bottom is formed in the valve rod positioning seat 6, and the second valve rod positioning hole 601 is located right above the first valve rod positioning hole 207.

The valve rod 4 comprises an upper valve rod 401, a connector 402 and a lower valve rod 403 from top to bottom, a sliding sleeve 8 is coaxially embedded in a second valve rod positioning hole 601, a lower opening of the sliding sleeve 8 is communicated with a constant pressure cavity 7, the connector 402 is arranged in the sliding sleeve 8, the connector 402 is in movable sealing fit with the sliding sleeve 8, an upper valve rod clamping groove 404 is arranged at the upper end of the connector 402, a lower valve rod clamping groove 405 is arranged at the lower end of the connector 402, the upper valve rod 401 is rotatably connected with the second valve rod positioning hole 601, the upper valve rod 401 cannot move up and down, an upper polygonal clamping head 406 matched with the upper valve rod clamping groove 404 is arranged at the lower end of the upper valve rod 401, the cross section of the upper polygonal clamping head 406 is regular hexagon, the lower end of the upper polygonal clamping head 406 extends into the upper valve rod clamping groove 404, and the upper polygonal clamping head 406 is in up-down sliding fit with the upper valve; when the connector 402 slides up and down, the upper polygonal clamping head 406 and the upper valve rod clamping groove 404 cannot be separated; the lower valve rod 403 is rotatably connected with the first valve rod positioning hole 207, the lower valve rod 403 cannot move up and down, the lower end of the lower valve rod 403 is connected with the valve ball 203, the lower valve rod 403 drives the valve ball 203 to rotate, the upper end of the lower valve rod 403 is provided with a lower polygonal clamping head 407 matched with the lower valve rod clamping groove 405, the cross section of the lower polygonal clamping head 407 is a regular hexagon, when the connector 402 is located at the lowest limit position, the lower polygonal clamping head 407 is connected with the lower valve rod clamping groove 405 in an inserting mode, and when the connector 402 is located at the highest limit position, the lower polygonal clamping head 407 is disconnected with the lower valve rod clamping groove 405; the upper end of the connector 402 is provided with a spring 9 for pressing down the connector 402.

An annular flange 602 is arranged at the top of the valve rod positioning seat 6 around the second valve rod positioning hole 601, the top of the annular flange 602 extends inwards to form a first flange 603, a cutting sleeve 10 is sleeved outside the annular flange 602, the cutting sleeve 10 and the annular flange 602 are coaxially arranged, the top of the cutting sleeve 10 extends inwards to form a second flange 1001, and the second flange 1001 is located on the upper side of the first flange 603; a convex ring 408 is annularly arranged on the side wall of the upper valve rod 401, and the convex ring 408 is positioned between the first flange 603 and the second flange 1001. The upper end of the spring 9 abuts against the first flange 603, and the lower end of the spring 9 abuts against the connector 402.

When the valve body 2 is used in a running pipe network, if leakage exists at the position of the valve ball 203 or the valve rod 4, the pipe network is cut off, the valve body positioning ring 5 is screwed off in a rotating mode, the whole valve body 2 is extracted from the upper opening of the valve body accommodating cavity 101 of the valve seat 1, and the valve body 2 is replaced and placed into a new valve body 2. In the process of lifting and extracting the valve body 2, the sliding sleeve 201 positioned outside the valve body 2 and the positioning sleeve 103 in the valve seat 1 slide relatively until being separated. Such structural design need not to dismantle whole ball valve, also can not destroy welded pipe network, only needs to change the inside valve body 2 of a detachable, and construction convenience, greatly reduced pipe network maintenance cost.

If the leakage occurs at the valve rod 4, the leaked air pressure enters the constant pressure cavity 7 through the lower valve rod 403, so that the pressure in the constant pressure cavity 7 is increased, the lower opening of the sliding sleeve 8 is communicated with the constant pressure cavity 7, when the pressure in the constant pressure cavity 7 is increased to a certain value, the connector 402 in the sliding sleeve 8 is pushed to move upwards, the spring 9 is compressed in the moving-up process of the connector 402, and finally, the connector 402 is separated from the lower valve rod 403 as shown in fig. 9, at the moment, even if an operator rotates the upper valve rod 401, the lower valve rod 403 and the valve ball 203 cannot rotate along with the upper valve rod 401.