CN208331374U - limiting device and valve - Google Patents

Abstract

The utility model provides a stop device and valve. Wherein, stop device includes: a first limiting piece and a second limiting piece; a first connecting part used for being fixedly connected with the valve body is formed on the first limiting part, and a second connecting part used for being fixedly connected with the valve rod is formed on the second limiting part; and a first matching part is formed on the first limiting part, a second matching part is formed on the second limiting part, and the second matching part is arranged on the first matching part in a sliding manner, so that the second matching part slides relative to the first matching part along the axis direction of the valve rod. The utility model provides a stop device and valve, valve rod along axis direction up-and-down motion's in-process, the relative first cooperation portion of axis direction that the valve rod can be followed to second cooperation portion slides to the restriction valve rod prevents the valve seal inefficacy around the rotation of its axis direction, has guaranteed its normal work.

Description

Limiting device and valve

Technical field

The utility model relates to valve technology field more particularly to a kind of limiting devices and valve.

Background technique

During production of hydrocarbons, in order to guarantee that the flow of each required medium in process flow can reach wanting for process flow It asks, needs that valve is arranged, by the adjusting to valve openings to realize the adjusting and truncation to flow, and then realize process flow Requirement.

In the prior art, especially in oil gas field, the valve for controlling high temperature fluid medium is usually with wave The valve of line pipe device, the valve include valve body and valve rod, and valve rod is connected on valve body, by along the axis direction of valve rod Ovable valve stem, the size of adjustable valve openings, such as half-open, standard-sized sheet or full off state are moved down, realizes the circulation area of valve It adjusts, to realize the adjusting and truncation of rate-of flow.

But there is the valve of bellows arrangement outside valve in the prior art, especially valve rod, when adjusting, valve rod exists It will appear the rotation around valve rod axis direction while up and down motion, be easy to cause valve packing and sylphon seal to fail, valve Phenomena such as door can not work normally.

Utility model content

The utility model provides a kind of limiting device and valve, be easy rotation when valve rod is mobile in the prior art to overcome and The problem of causing valve packing and sylphon seal to fail.

The utility model provides a kind of limiting device, comprising: the first locating part and the second locating part；First limit It is formed with the first connecting portion for being fixedly connected with the valve body on part, is formed on second locating part for being fixed with valve rod The second connecting portion of connection；And the first auxiliary section is also formed on first locating part, it is formed on second locating part Second auxiliary section, second auxiliary section are slidably installed on first auxiliary section, so that second auxiliary section is along the valve The relatively described first auxiliary section sliding of the axis direction of bar.

Limiting device as described above, wherein first auxiliary section is along be parallel to that the axis direction extends the One protrusion, second auxiliary section are the first groove that shape and first protrusion match.

Limiting device as described above, wherein first auxiliary section is along be parallel to that the axis direction extends the One groove, second auxiliary section are shape and the first protrusion that first groove matches.

Limiting device as described above, wherein further include third locating part, be formed with third on the third locating part and match Conjunction portion and third interconnecting piece for being fixedly connected with the valve body, second locating part is along perpendicular to the flat of the axis Face extends, and the 4th auxiliary section, second auxiliary section and the 4th auxiliary section difference are also formed on second locating part The both ends of second locating part are set, and the second connecting portion includes the through-hole for wearing the valve rod；And it is described logical Hole is arranged between second auxiliary section and the 4th auxiliary section, and the 4th auxiliary section is slidably installed in the third auxiliary section On, so that the 4th auxiliary section is slided along the relatively described third auxiliary section of axis direction of the valve rod.

Limiting device as described above, wherein the third auxiliary section is along be parallel to that the axis direction extends the Two protrusions, the 4th auxiliary section are the second groove that shape and second protrusion match.

Limiting device as described above, wherein the third auxiliary section is along be parallel to that the axis direction extends the Two grooves, the 4th auxiliary section are shape and the second protrusion that second groove matches.

Limiting device as described above, wherein the distance between second auxiliary section and the second connecting portion and institute It is equal to state the distance between the 4th auxiliary section and described second connecting portion.

Limiting device as described above, wherein second locating part includes flat part and convex along the axis direction For the boss of the flat part, second auxiliary section and the 4th auxiliary section are separately positioned on the two of the flat part It holds, is formed with the through-hole on the flat part, and the through-hole also extends through the boss；The side of the boss forms pin Hole, pin match after passing through the pin hole with the matching hole of the stem exterior surface.

Limiting device as described above, wherein the cross-sectional shape of the through-hole is regular polygon.

The utility model also provides a kind of valve, comprising: valve rod described in valve body, valve rod and limiting device as described above It is connected on the valve body, and the valve rod can be along the relatively described valve body of axis direction of the valve rod；The limit dress The first connecting portion set is fixed on the valve body, and the second connecting portion of the limiting device is fixed on the valve rod.

Limiting device and valve provided by the utility model pass through the first locating part of setting and the second locating part；Wherein, First locating part is fixedly connected with the valve body, and the second locating part is fixedly connected with valve rod；And first is formed with first on locating part and matches Conjunction portion is formed with the second auxiliary section on the second locating part, and the second auxiliary section can be slidedly arranged on the first auxiliary section；Valve rod is along axis side During up and down motion, the second auxiliary section can be slided along the axis direction of valve rod with respect to the first auxiliary section, to limit Valve rod prevents valve seal from failing around the rotation of its axis direction, ensure that its normal work.

Detailed description of the invention

Specific embodiment of the present utility model is described in detail below in conjunction with attached drawing, it should be appreciated that herein Described specific embodiment is only used for describing and explaining the present invention, and the utility model is not limited to following specific realities Apply mode.

Fig. 1 is the main view of the utility model limiting device embodiment one；

Fig. 2 is the top view of the utility model limiting device embodiment one；

Fig. 3 is the top view of the utility model limiting device embodiment two；

Fig. 4 is the main view of the utility model limiting device embodiment three；

Fig. 5 is the top view of the utility model limiting device embodiment three；

Fig. 6 is the main view of the utility model limiting device example IV.

Description of symbols:

1: the first locating part；11: first connecting portion；

12: the first auxiliary sections；13: the first protrusions；

2: the second locating parts；21: second connecting portion；

22: the second auxiliary sections；23: the first grooves；

24: the four auxiliary sections；25: the second grooves；

26: flat part；27: through-hole；

28: boss；29: pin hole；

3: third locating part；31: third interconnecting piece；

32: third auxiliary section；33: the second protrusions；

4: valve rod.

Specific embodiment

During production of hydrocarbons, in order to guarantee that the flow of each required medium in process flow can reach wanting for process flow It asks, needs that valve is arranged, by the adjusting to valve openings to realize the adjusting and truncation to flow, and then realize process flow Requirement.

In the prior art, especially in oil gas field, the valve for controlling high temperature fluid medium is usually with wave The valve of line pipe device, the valve include valve body and valve rod, and valve rod is connected on valve body, by along the axis direction of valve rod Ovable valve stem, the size of adjustable valve openings, such as half-open, standard-sized sheet or full off state are moved down, realizes the circulation area of valve It adjusts, to realize the adjusting and truncation of rate-of flow.

But there is the valve of bellows arrangement outside valve in the prior art, especially valve rod, when adjusting, valve rod exists It will appear the rotation around valve rod axis direction while up and down motion, be easy to cause valve packing and sylphon seal to fail, valve Phenomena such as door can not work normally.

To solve the above-mentioned problems, the utility model embodiment provides a kind of limiting device and valve, to prevent valve tune Valve rod is rotated around axis direction during section.

Specific embodiment of the present utility model is described in detail below in conjunction with attached drawing, it should be appreciated that herein Described specific embodiment is only used for describing and explaining the present invention, and the utility model is not limited to following specific realities Apply mode.

Embodiment one

Fig. 1 is the main view of the utility model limiting device embodiment one；Fig. 2 is the utility model limiting device embodiment One top view.

Incorporated by reference to Fig. 1 and Fig. 2, the present embodiment provides a kind of limiting devices, comprising: the first locating part 1 and the second limit Part 2；It is formed with the first connecting portion 11 for being fixedly connected with the valve body on first locating part 1, is formed on the second locating part 2 useful In the second connecting portion 21 being fixedly connected with valve rod 4；And first is also formed with the first auxiliary section 12, the second limit on locating part 1 The second auxiliary section 22 is formed on part 2, the second auxiliary section 22 is slidably installed on the first auxiliary section 12 so that the second auxiliary section 22 along The axis direction of valve rod 4 is slided with respect to the first auxiliary section 12.

Specifically, limiting device can be applied to the opposite valve bodies of valve rod 4 and move up and down along the axis direction of valve rod 4, and The valve that valve rotatable around its axis, especially valve rod 4 have bellow seal is not needed.Valve may include valve rod 4 and valve body, 4 one end of valve rod can be plugged in valve body, valve rod 4 moves up and down the through-flow of adjustable valve along its axis direction Area.Limiting device can connect between valve body and valve rod 4, and limiting device may include the first locating part 1 and the second limit Part 2, the first locating part 1 are fixedly connected with the valve body, and the second locating part 2 is fixedly connected with valve rod 4, and the first locating part 1 can be with Two locating parts, 2 collective effect can limit valve rod 4 and rotate around axis direction when valve rod 4 moves up and down in the axial direction.

The first connecting portion 11 for being fixedly connected with the valve body, the knot of first connecting portion 11 are formed on first locating part 1 Structure can there are many, such as first connecting portion 11 can be connecting hole, could be formed with threaded hole on valve body, screw can pass through Connecting hole and screw hole；In another example first connecting portion 11 can be grab, it could be formed on valve body and engage with grab Card slot is engaged with card slot by grab and is achieved a fixed connection.In addition, the first locating part 1 can also pass through welding or one with valve body It is body formed to form.

The second connecting portion 21 for being fixedly connected with valve rod 4, the knot of second connecting portion 21 are formed on second locating part 2 Structure can also there are many, such as second connecting portion 21 can be connecting hole, could be formed with threaded hole on valve rod 4, and screw can be with Across connecting hole and screw hole；In another example second connecting portion 21 can be grab, could be formed with and grab card on valve rod 4 The card slot of conjunction, is engaged with card slot by grab and is achieved a fixed connection.

It is also formed with the first auxiliary section 12 on first locating part 1, the second auxiliary section 22 is also formed on the second locating part 2, Second auxiliary section 22 can be slided with respect to the first auxiliary section 12 along axis direction is parallel to, the first auxiliary section 12 and the second auxiliary section 22 can also match to limit the rotation of valve rod 4.The structure of first auxiliary section 12 and the second auxiliary section 22 can there are many, example Such as, the mounting hole that the first auxiliary section 12 can be overlapped with 4 axis of valve rod for axis, the mounting hole can be non-circular hole, second Locating part 2 can be the tubular structure for being fixed on 4 outer surface of valve rod, and the outer surface of the second locating part 2 can be the second auxiliary section 22, the cross-sectional shape of second auxiliary section 22 and the shape of mounting hole are consistent, since mounting hole is non-circular hole, can limit It makes and relatively rotates between the second auxiliary section 22 and mounting hole, rotate to limit valve rod 4.Preferably, the second cooperation It can be clearance fit between portion 22 and mounting hole, allow valve rod 4 that the opposite mounting hole of the second limiting section 22 is driven to transport up and down It is dynamic.In addition, the second locating part 2 can be integrally formed with valve rod 4, to simplify process.

When the flow of control valve, can be moved up and down in the axial direction with driving stem 4 with respect to valve body, second matches at this time Conjunction portion 22 can be slided with respect to the first auxiliary section 12 along axis direction is parallel to, and due to the first auxiliary section 12 and the second cooperation Portion 22 matches, and can limit valve rod 4 around the rotation of axis direction, to prevent valve seal from failing.

Limiting device provided in this embodiment passes through the first locating part of setting and the second locating part；Wherein, the first limit Part is fixedly connected with the valve body, and the second locating part is fixedly connected with valve rod；And first is formed with the first auxiliary section on locating part, second The second auxiliary section is formed on locating part, the second auxiliary section can be slidedly arranged on the first auxiliary section；Valve rod is transported up and down in the axial direction In dynamic process, the second auxiliary section can be slided along the axis direction of valve rod with respect to the first auxiliary section, to limit valve rod around it The rotation of axis direction, prevents valve seal from failing, and ensure that its normal work.

As the mode that is preferably carried out of the first auxiliary section 12 and the second auxiliary section 22, the first auxiliary section 12 can be for along flat The first protrusion 13 that row extends in axis direction, the second auxiliary section 22 are the first groove that shape and the first protrusion 13 match 23。

Fig. 2 can be specifically referred to, the first locating part 1 can have the first face that an edge is parallel to axis direction extension, First protrusion 13 can protrude from plane setting, and the second locating part 2 can have one can be with the second of the first face contact Face, the first groove 23 can be set in second face, and the shape of the first protrusion 13 can match with the shape of the first groove 23 Close, for example, its can all be it is arc-shaped or rectangular etc. a variety of, be not specifically limited herein.

When the flow of control valve, can be moved up and down in the axial direction with driving stem 4 with respect to valve body, the first groove 23 It can occur along being parallel to that axis direction is opposite to be slided with the first protrusion 13, and due to the first face and the second face contact, first The inner wall contact of the outer wall and the second groove 23 of protrusion 13 can further prevent between the first locating part 1 and the second locating part 2 Relative rotation, to prevent valve rod 4 from rotating.

Embodiment two

Fig. 3 is the top view of the utility model limiting device embodiment two.Incorporated by reference to Fig. 3, the present embodiment is in embodiment First auxiliary section 12 and the second auxiliary section 22 are improved on the basis of one, other structures are the same as example 1, and specifically may be used With reference implementation example one.In the present embodiment, the first auxiliary section 12 be along be parallel to axis direction extension the first groove 23, second Auxiliary section 22 is shape and the first protrusion 13 that the first groove 23 matches.

First locating part 1 can have the first face that an edge is parallel to axis direction extension, and the first groove 23 can be with shape At in the plane, the second locating part 2 can have one can be with the second face of the first face contact, and the first protrusion 13 can be convex For second face, the shape of the first protrusion 13 can be matched with the shape of the first groove 23, such as it can all be circular arc Shape is rectangular etc. a variety of, is not specifically limited herein.

When the flow of control valve, can be moved up and down in the axial direction with driving stem 4 with respect to valve body, the first groove 23 It can occur along being parallel to that axis direction is opposite to be slided with the first protrusion 13, and due to the first face and the second face contact, first The inner wall contact of the outer wall and the first groove 23 of protrusion 13 can further prevent between the first locating part 1 and the second locating part 2 Relative rotation, to prevent valve rod 4 from rotating.

The present embodiment provides limiting devices, be parallel to axis direction extension by the way that edge is arranged on the first locating part first The first protrusion is arranged in groove on the second locating part, and the first protrusion can be slided in the first groove, while the shape of the first protrusion Shape is matched with the first groove shapes, can be limited valve rod and be rotated around axis direction.

Embodiment three

Fig. 4 is the main view of the utility model limiting device embodiment three；Fig. 5 is the utility model limiting device embodiment Three top view.Incorporated by reference to Fig. 4 and Fig. 5, the present embodiment be on the basis of embodiment one or embodiment two to limiting device into Row improves, and in the present embodiment, limiting device further includes third locating part 3, be formed on third locating part 3 third auxiliary section 32 with And the third interconnecting piece 31 for being fixedly connected with the valve body, the second locating part 2 prolong along the plane of the axis direction perpendicular to valve rod 4 It stretches, also forms the 4th auxiliary section 24 on the second locating part 2, the second auxiliary section 22 and the 4th auxiliary section 24 are separately positioned on the second limit The both ends of position part 2, second connecting portion 21 includes the through-hole 27 for wearing valve rod 4；And through-hole 27 is arranged in the second auxiliary section 22 Between the 4th auxiliary section 24, the 4th auxiliary section 24 is slidably installed on third auxiliary section 32, so that the 4th auxiliary section 24 is along valve rod 4 Axis direction with respect to third auxiliary section 32 slide.

Specifically, third locating part 3 is additionally provided on limiting device, third locating part 3 is fixed by third interconnecting piece 31 On valve body, the structure of third interconnecting piece 31 can there are many, such as third interconnecting piece 31 can be connecting hole, can be on valve body It is formed with threaded hole, screw can pass through connecting hole and screw hole；In another example third interconnecting piece 31 can be grab, valve body On could be formed with the card slot engaged with grab, engaged by grab with card slot and achieved a fixed connection.In addition, third interconnecting piece 31 Structure can be identical as first connecting portion 11, can also be different from first connecting portion 11, be not specifically limited herein.

Second locating part 2 can be to extend along 4 cross-sectional direction of valve rod, and valve rod 4 can be fixedly connected on the second locating part 2 Middle position through-hole 27 in.It is additionally provided with third auxiliary section 32 on third locating part 3, is also formed on the second locating part 2 4th auxiliary section 24, third auxiliary section 32 and the 4th auxiliary section 24 are along the opposite sliding of axis direction is parallel to, so that valve rod 4 can only It is slided in the axial direction with respect to third locating part 3, further limits the rotation of valve rod 4.The structure and function of third auxiliary section 32 It is same or similar with the first auxiliary section 12, specifically can refer to the first auxiliary section 12, the structure and function of the 4th auxiliary section 24 with Second auxiliary section 22 is same or similar, can specifically refer to the second auxiliary section 22.Third auxiliary section 32 and the 4th auxiliary section 24 Connection type can refer to the connection type of the first auxiliary section 12 and the second auxiliary section 22.

Preferably, third auxiliary section 32 is along the second protrusion 33 for being parallel to axis direction extension, and the 4th auxiliary section 24 is The second groove 25 that shape and the second protrusion 33 match.Fig. 5 can be specifically referred to, third locating part 3 can have an edge It is parallel to the third face of axis direction extension, the second protrusion 33 can protrude from plane setting, and the second locating part 2 can have One can be set in the fourth face with the fourth face of third face contact, the second groove 25, the shape of the second protrusion 33 Can be matched with the shape of the second groove 25, for example, its can all be it is arc-shaped or rectangular etc. a variety of, do not do herein specific It limits.It is understood that third auxiliary section 32 can be for along the second groove for being parallel to axis direction extension, the 4th auxiliary section The second protrusion to match for shape and the second groove.

Further, the distance between the second auxiliary section 22 and second connecting portion 21 and the 4th auxiliary section 24 and second connecting portion The distance between 21 is equal, further such that 4 stress equalization of valve rod.

Limiting device provided in this embodiment, by the way that third locating part is arranged, third locating part is fixed on valve body, thereon It is formed with third auxiliary section, the 4th auxiliary section is also formed on the second locating part, third auxiliary section is matched with the 4th auxiliary section, To further limit the rotation of valve rod, effect is good.

Example IV

Fig. 6 is the main view of the utility model limiting device example IV.Incorporated by reference to Fig. 6, the present embodiment is in above-mentioned reality It applies and the second locating part 2 is improved on the basis of example, other structures can refer to above-described embodiment, and details are not described herein.

In the present embodiment, the second locating part 2 includes flat part 26 and the boss for protruding from flat part 26 in the axial direction 28, the second auxiliary section 22 and the 4th auxiliary section 24 are separately positioned on the both ends of flat part 26, are formed on flat part 26 for wearing If the through-hole 27 of valve rod 4, and through-hole 27 also extends through boss 28；The side of boss 28 forms the pin hole 29 for being used for 4 pin joint of valve rod, pin Nail matches after pin hole with the matching hole of stem exterior surface.

Specifically, the second locating part 2 includes the flat part 26 extended along the direction perpendicular to axis direction, and boss 28 connects On flat part 26, the through-hole 27 that axis is overlapped with 4 axis of valve rod can be set on flat part 26,28 axis of boss can be with 27 axis of through-hole is overlapped, and through-hole 27 also extends through boss 28, valve rod 4 is plugged in inside flat part 26 and boss 28.It is convex The side of platform 28 can also be formed with pin hole 29, and the outer surface of valve rod 4 also could be formed with matching hole, and pin can pass through pin hole 29 are fixed in the matching hole of valve rod 4, so that further enhance valve rod 4 and the second locating part 2 is fixedly connected with degree.In addition, It is understood that through-hole 27 be located at the partial cross sectional shape that the part in boss 28 is located in flat part 26 with through-hole 27 can It can also be different with identical, be not specifically limited herein, i.e., it is at least partly identical as the shape of valve rod 4 in through-hole 27.Boss 28 Shape can there are many, such as it is cylindrical or rectangular etc..

The shape of through-hole 27 can there are many, such as round or irregular shape, further, the cross section shape of through-hole 27 Shape is regular polygon.The cross-sectional shape of valve rod 4 is also regular polygon, to further limit between valve rod 4 and through-hole 27 It relatively rotates.

Limiting device provided in this embodiment, by including flat part and boss by the second locating part, so that valve rod can be with It is threaded through inside flat part and boss, while being fixedly connected, connection can also be improved with the second locating part in realization valve rod Intensity.

Embodiment five

The utility model also provides a kind of valve, comprising: valve body, valve rod 4 and limiting device, valve rod 4 are connected to valve body On, and valve rod 4 can be along the opposite valve body of axis direction of the valve rod 4；Limiting device, comprising: the first locating part 1 and Two locating parts 2；The first connecting portion 11 for being fixedly connected with the valve body, shape on the second locating part 2 are formed on first locating part 1 At the second connecting portion 21 having for being fixedly connected with valve rod 4；And first is also formed with the first auxiliary section 12 on locating part 1, It is formed with the second auxiliary section 22 on two locating parts 2, the first auxiliary section 12 and the second auxiliary section 22 can be along being parallel to axis direction Opposite sliding, and the first auxiliary section 12 is also matched with the second auxiliary section 22, to limit valve rod 4 around the rotation of axis direction, In, being parallel to axis direction is the direction parallel with axis direction.The first connecting portion 11 of limiting device is fixed on valve body, The second connecting portion 21 of limiting device is fixed on valve rod 4.

Specifically, valve may include valve rod 4 and valve body, and 4 one end of valve rod can be plugged in valve body, and valve opening or When closing, valve rod 4 moves up and down in the axial direction with respect to valve body, and limiting device can limit valve rod 4 and turn around its axis direction It is dynamic.The structure and function of limiting device can refer to above-described embodiment, and details are not described herein.

When the flow of control valve, can be moved up and down in the axial direction with driving stem 4 with respect to valve body, second matches at this time Conjunction portion 22 can be slided with respect to the first auxiliary section 12 along axis direction is parallel to, and due to the first auxiliary section 12 and the second cooperation Portion 22 matches, can be with limiting valve body 4 around the rotation of axis direction, to prevent valve seal from failing.

Valve provided in this embodiment passes through the first locating part of setting and the second locating part；Wherein, the first locating part with Valve body is fixedly connected, and the second locating part is fixedly connected with valve rod；And first is formed with the first auxiliary section, the second limit on locating part The second auxiliary section is formed on part, the second auxiliary section can be slidedly arranged on the first auxiliary section；What valve rod moved up and down in the axial direction In the process, the second auxiliary section can be slided along the axis direction of valve rod with respect to the first auxiliary section, to limit valve rod around its axis The rotation in direction, prevents valve seal from failing, and ensure that its normal work.

In the present invention, term " first ", " second " are used only for the purpose of description, and should not be understood as instruction or Imply relative importance；The indicating positions such as term " on ", "lower", "top", "bottom" or positional relationship are side based on the figure Position or positional relationship are merely for convenience of description the utility model, rather than the device or original part of indication or suggestion meaning are necessary With specific orientation, it is constructed and operated in a specific orientation；Unless otherwise clearly defined and limited, " installation ", " connection " Equal terms are broadly understood, for example, " connection " may be fixed connection or may be dismantle connection, or integral connection. For the ordinary skill in the art, above-mentioned term in the present invention specific can be understood as the case may be Meaning.

In the description of this specification, reference term " embodiment ", " some embodiments ", " schematically implementation The description of mode ", " example ", " specific example " or " some examples " etc. means embodiment or example is combined to describe specific Feature, structure, material or feature are contained at least one embodiment or example of the utility model.In this specification In, schematic expression of the above terms are not necessarily referring to identical embodiment or example.Moreover, the specific spy of description Sign, structure, material or feature can be combined in any suitable manner in any one or more embodiments or example.

Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new The range of each embodiment technical solution of type.

Claims (10)

1. a kind of limiting device characterized by comprising the first locating part and the second locating part；

It is formed with the first connecting portion for being fixedly connected with the valve body on first locating part, is formed on second locating part There is the second connecting portion for being fixedly connected with valve rod；And the first auxiliary section is also formed on first locating part, described The second auxiliary section is formed on two locating parts, second auxiliary section is slidably installed on first auxiliary section, so that described second It is slided along relatively described first auxiliary section of axis direction of the valve rod auxiliary section.

2. limiting device according to claim 1, which is characterized in that first auxiliary section is that edge is parallel to the axis The first protrusion that direction extends, second auxiliary section are the first groove that shape and first protrusion match.

3. limiting device according to claim 1, which is characterized in that first auxiliary section is that edge is parallel to the axis The first groove that direction extends, second auxiliary section are shape and the first protrusion that first groove matches.

4. limiting device according to claim 1-3, which is characterized in that it further include third locating part, described Third auxiliary section and the third interconnecting piece for being fixedly connected with the valve body, second limit are formed on three locating parts Part extends along the plane perpendicular to the axis, and the 4th auxiliary section, second cooperation are also formed on second locating part Portion and the 4th auxiliary section are separately positioned on the both ends of second locating part, and the second connecting portion includes for wearing State the through-hole of valve rod；And the through-hole is arranged between second auxiliary section and the 4th auxiliary section, the 4th cooperation Portion is slidably installed on the third auxiliary section, so that axis direction relatively described third of the 4th auxiliary section along the valve rod Auxiliary section sliding.

5. limiting device according to claim 4, which is characterized in that the third auxiliary section is that edge is parallel to the axis The second protrusion that direction extends, the 4th auxiliary section are the second groove that shape and second protrusion match.

6. limiting device according to claim 5, which is characterized in that the third auxiliary section is that edge is parallel to the axis The second groove that direction extends, the 4th auxiliary section are shape and the second protrusion that second groove matches.

7. limiting device according to claim 6, which is characterized in that second auxiliary section and the second connecting portion it Between distance it is equal with the distance between the 4th auxiliary section and the second connecting portion.

8. limiting device according to claim 7, which is characterized in that second locating part includes flat part and along institute The boss that axis direction protrudes from the flat part is stated, second auxiliary section and the 4th auxiliary section are separately positioned on described The both ends of flat part are formed with the through-hole on the flat part, and the through-hole also extends through the boss；The side of the boss Face forms pin hole, and pin matches after passing through the pin hole with the matching hole of the stem exterior surface.

9. limiting device according to claim 8, which is characterized in that the cross-sectional shape of the through-hole is regular polygon.

10. a kind of valve characterized by comprising valve body, valve rod and the described in any item limiting devices of claim 1-9, The valve rod is connected on the valve body, and the valve rod can be along the relatively described valve body of axis direction of the valve rod；Institute The first connecting portion for stating limiting device is fixed on the valve body, and the second connecting portion of the limiting device is fixed on the valve rod On.