JP5189933B2 - Control valve - Google Patents

Description

  The present invention relates to a top guide type globe-type single seat control valve.

Conventionally, remote control valves that are roughly classified into pneumatic, hydraulic, electric, or self-powered types are used depending on the power source of the drive unit that drives the valve body. For example, Patent Documents 1 and 2 describe a top guide type globe-type single seat control valve, in which a plug head as a valve body is fixed to the tip of a columnar plug guide, and the plug guide slides in the guide ring. It has a structure to do. That is, the plug guide that is driven by the drive unit and moves forward and backward slides while being guided in the guide ring, and the plug head is fitted to or detached from the seat ring provided in the flow path, thereby opening and closing the valve. It has a structure.
JP 60-125481 A JP 61-105375 A

  However, when the handling fluid enters the gap between the plug guide and the guide ring, the fluid may be superposed or stuck by frictional heat, or may crystallize at a low temperature and the valve may not move.

  The present invention has been made to solve the problems associated with the above-described prior art, and an object thereof is to provide a regulating valve capable of suppressing the sticking of the valve.

The control valve according to the present invention that achieves the above-described object is provided such that a columnar plug guide that is connected to a plug head that is a valve body and can be moved back and forth in one direction is disposed inside a ring-shaped guide ring in a valve chamber in which a handling fluid flows a slidably retained adjusted valve, the plug guide cross section is triangle, the the corners of the triangle which is in contact with the guide ring, and inclined forward and backward movement direction of the plug guide A groove is formed.

  In the control valve according to the present invention configured as described above, the plug guide has a polygonal cross-sectional shape, and a groove is formed at the corner. Heat generation is reduced, and the amount of accumulated liquid in the gap between the plug guide and the guide ring is reduced. As described above, the frictional heat and the amount of staying liquid are reduced to suppress polymerization and seizure in the gap between the plug guide and the guide ring of the handling fluid, or the amount of staying liquid is reduced to suppress crystallization of the handling fluid. Thus, sticking of the valve can be suppressed. In addition, because the groove is inclined with respect to the forward / backward direction of the plug guide, fluid can be easily discharged from the groove, the amount of accumulated liquid in the gap between the plug guide and the guide ring can be further reduced, and the sticking of the valve can be more effectively suppressed. Is done.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a plan view of a regulating valve according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the regulating valve, and FIG. 3 is a sectional view taken along line III-III in FIG.

  As shown in FIGS. 1 and 2, the control valve 1 according to the present embodiment is a top guide type control valve 1 that guides one upper portion of a valve body (plug head 2). The valve body is a globe-shaped single seat valve that can move in one direction.

  This control valve 1 includes a main body 3 in which a flow path 6 through which an easily polymerizable fluid that is a handling fluid flows is formed, and a plug head 2 that communicates with the flow path 6 and moves in a valve chamber 4 through which the handling fluid flows. I have. The valve chamber 4 of the main body 3 is provided with an annular seat ring 5 into which the plug head 2 is fitted or detached.

  The plug head 2 is fixed to a lower end of a columnar plug guide 7, and the plug guide 7 is connected to a drive stem 8 provided above and connected to a valve stem 9 that can move forward and backward in the axial direction. In the present embodiment, a pneumatic diaphragm is applied to the drive unit 8, but the present invention is not limited to this, and another pneumatic power source such as a pneumatic type, a hydraulic type, an electric type, or a self-powered type may be applied. .

  The plug guide 7 is slidably held inside an annular guide ring 11 fitted and fixed in an opening 10 formed in the upper part of the main body 3. The guide ring 11 is a member for suppressing the vibration of the plug guide 7 that may occur in the valve chamber 4 due to the fluid, and has an inner peripheral surface 12 having a circular cross-sectional shape.

  A lid 13 is provided above the opening 10 formed in the main body 3 so as to cover the guide ring 11. The lid 13 is fixed to the main body 3 with bolts 14 or the like, and the guide ring 11 is sandwiched between the lid 13 and the main body 3.

  The valve stem 9 connected to the plug guide 7 penetrates the upper portion of the lid 13 so as to be slidable while being sealed by the gland packing 18. The gland packing 18 is sealed by a gland bush 19, and the gland bush 19 is fixed by a gland flange 21 fixed to the upper part of the lid body 13 by a gland bolt 20.

  In addition, a yoke 22 that houses the valve stem 9 inside and holds the drive unit 8 at the top is fixed to the upper portion of the lid 13 by a yoke nut 23.

  As shown in FIGS. 2 and 3, the plug guide 7 is formed in a triangular column shape in cross section, and the triangular corner 25 becomes a curved surface corresponding to the shape of the inner peripheral surface 12 of the guide ring 11. The corners are cut off and chamfered. In each corner portion 25, a plurality of groove portions 26 inclined with respect to the advance / retreat direction of the plug guide 7 are formed side by side in the advance / retreat direction. The corner 25 of the plug guide 7 slides in contact with the inner peripheral surface 12 of the guide ring 11. In addition, the corner | angular part 25 of the plug guide 7 does not necessarily need to be chamfered so that it may become a curved surface, and may be chamfered so that it may become a plane. In the present embodiment, the cross-sectional shape of the plug guide 7 is a triangle, but it may be a polygon having a larger number of corners such as a quadrangle.

  Next, the operation of the control valve 1 according to this embodiment will be described.

  When the drive unit 8 is operated to open and close the valve to move the plug head 2 forward and backward with respect to the seat ring 5, the plug guide 7 slides along the inner peripheral surface 12 of the guide ring 11. At this time, since the cross-sectional shape of the plug guide 7 is triangular, the sliding surface between the plug guide 7 and the guide ring 11 is only a portion corresponding to the corner portion 25, and the sliding surface is small. Furthermore, since the groove part 26 is formed in the corner | angular part 25, a sliding surface reduces more. Thus, the reduction of the sliding surface reduces the generation of frictional heat due to the sliding of the plug guide 7 and the guide ring 11, and reduces the amount of accumulated liquid in the gap between the plug guide 7 and the guide ring 11. Therefore, due to the reduction of frictional heat and the amount of staying liquid, polymerization of the easily polymerizable fluid in the gap between the plug guide 7 and the guide ring 11 is suppressed, and the sticking of the valve can be effectively suppressed.

  Further, since the groove portion 26 is formed to be inclined with respect to the advancing / retreating direction of the plug guide 7, the easily polymerizable fluid is easily discharged. As a result, the amount of staying liquid in the gap between the plug guide 7 and the guide ring 11 is further reduced, and the sticking of the valve due to the polymerization of the easily polymerizable fluid is more effectively suppressed.

  In addition, if the cross-sectional shape of the plug guide 7 is a polygon, it is a sliding surface compared with the case where the cross-sectional shape is circular (when the entire outer peripheral surface of the plug guide slides with the inner peripheral surface of the guide ring). Therefore, it is possible to reduce the frictional heat and the amount of staying liquid, but the sliding area can be reduced most by using the triangle with the smallest number of corners. Therefore, as in this embodiment, it is most preferable for the plug guide 7 to have a triangular cross-sectional shape for reducing the frictional heat and the amount of staying liquid.

  Moreover, since the corner | angular part 25 of the plug guide 7 is chamfered, damage to the internal peripheral surface 12 of the guide ring 11 with which the corner | angular part 25 slides can be suppressed. In particular, since the corner portion 25 is chamfered so as to be a curved surface corresponding to the shape of the inner peripheral surface 12 of the guide ring 11, the damage to the inner peripheral surface 12 of the guide ring 11 can be more effectively suppressed. Can do.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, the control valve 1 according to the present embodiment is a top guide type control valve, but the present invention can also be applied to a top and bottom guide type control valve that guides the upper and lower portions of the valve body. . Further, the valve body may be a double seat valve instead of a single seat valve. Further, the corner portion 25 of the plug guide 7 can be structured not to be chamfered. Further, the guide ring 11 and the lid 13 may be integrally formed as the same member.

  In addition, the present invention has a remarkable effect even if the handling fluid is not limited to the easily polymerizable fluid. For example, by reducing the frictional heat and the amount of staying liquid by the above-described control valve 1, seizure of the handling fluid in the gap between the plug guide 7 and the guide ring 11 can be suppressed, and the sticking of the valve can be effectively suppressed. For example, even when an easily crystallized fluid that crystallizes at a low temperature is used as the handling fluid, the amount of staying liquid can be reduced by reducing the sliding area, and the fluid can be discharged by the inclined groove portion 26. Crystallization in the gap between the guide 7 and the guide ring 11 is suppressed, and sticking of the valve can be effectively suppressed.

It is a top view of the control valve which concerns on embodiment of this invention. It is an expanded sectional view of the control valve which concerns on embodiment of this invention. It is sectional drawing which follows the III-III line of FIG.

Explanation of symbols

1 control valve,
2 Plug head,
4 Valve room,
5 Seat ring,
6 flow path,
7 Plug guide,
11 Guide ring,
12 Inner circumferential surface,
25 corners,
26 Groove.

Claims (4)

A columnar plug guide that is connected to a plug head that is a valve body and can be moved back and forth in one direction is a control valve that is slidably held inside an annular guide ring in a valve chamber in which a handling fluid flows. ,
The plug guide is cross-sectional shape triangle, the the corners of the triangle which is in contact with the guide ring, the plug guide regulating valve which moves back and forth direction and the groove is inclined is formed.   The control valve according to claim 1, wherein the corner portion is chamfered.   The control valve according to claim 2, wherein the corner portion is chamfered with a curved surface corresponding to an inner peripheral surface of the guide ring with which the corner portion contacts.   The control valve according to claim 1, wherein the handling fluid is an easily polymerizable fluid.

Images