JPH0681005U - Pressure reducing valve - Google Patents

Abstract

(57) [Summary] [Purpose] The structure is simplified, the operation is reliable, and it is robust, facilitating production, quality control, maintenance such as inspection and maintenance, and making it economically superior. [Structure] In the hollow cylindrical cylinder 2, a valve portion 15 on the high pressure side facing the valve seat 10 and an enlarged portion 16 having a larger diameter than the valve portion 15 arranged toward the low pressure side connection port 24. And a coil spring 17 for applying a biasing force in a direction in which the valve portion 15 and the valve seat 10 separate from each other. Are allowed to pass, and the structure is simplified and the fluid flow in the piston valve 14 is stabilized.

Description

[Detailed description of the device]       [0001]     [Industrial applications]   The present invention is a decompression force for equipment that utilizes fluid pressure such as air pressure, oil pressure, and water pressure. The present invention relates to a pressure reducing valve used for control.       [0002]     [Prior art]   In the conventional automatic control pressure reducing valve, the chamber with the valve is placed in the controlled fluid path. Therefore, the control part of the valve part is a die installed in a room separate from the chamber where the valve part is placed. The yaf ram is operated by the control pressure detected from the low pressure side of the valve, It is constructed so that valve movement is performed by transmitting the movement of the ear flap to the valve portion. There is something.       [0003]   The pressure reducing valve with the above configuration requires delicate small parts, small-diameter holes, links, etc. The operating range (pressure, flow rate), operation is reliable due to its complicated structure. Performance, robustness of mechanism, stability of quality, easiness of manufacturing, economical efficiency, easiness of maintenance, etc. There was a problem.       [0004]   Therefore, as a pressure reducing valve in which a control pressure detecting portion and a valve portion are integrated, there is a Japanese patent publication 49-41942, Japanese Examined Patent Publication No. 50-16532, and Japanese Utility Model Publication No. 51-152115. There is something.       [0005]   However, even with the above pressure reducing valve, the structure is complicated and good operation is stabilized. There is a problem that it is difficult to       [0006]     [The purpose of the device]   The purpose of the present invention is to solve the above problems of the prior art, simplify the structure, and It is reliable and robust, and easy to maintain such as production, quality control and inspection and maintenance. It is to provide a pressure reducing valve that is economical.       [0007]     [Constitution of device]   The pressure reducing valve of the present invention includes a valve seat portion provided on the high pressure side connection port side of the body; It has a hollow cylindrical shape that allows fluid to pass through, and the pressure receiving area at one end of the hollow cylindrical shape is at the other end. Since the pressure is larger than the pressure receiving area, the thrust will act in the valve closing direction during use. Has an enlarged part at one end, and the end with the smaller pressure receiving area faces the valve seat. However, the piston with the end with the larger pressure receiving area facing the low pressure side connection port Ton valve section; cylinder section for holding the piston valve section airtight; and piston valve Is provided outside the valve section and counters the thrust in the valve closing direction against the piston valve section. And an elastic portion for imparting sexual power.       [0008]   Hereinafter, the configuration, the operating principle, the effect and the like will be specifically described by way of examples. It       [0009]     【Example】   FIG. 1 is a sectional view of a pressure reducing valve according to a first embodiment of the present invention. One end of the cylinder portion 2 is connected via an O-ring 4, and the other end of the cylinder portion 2 is connected. The low pressure side body 3 is connected via an O-ring 5.       [0010]   A high pressure side connection port 6 is provided on the side portion of the high pressure side body 1, and the upper side in the figure A valve seat holding portion 8 holding the valve seat 7 is airtightly coupled via an O-ring 9. It A disc-shaped valve seat 10 made of hard rubber or Teflon is formed under the valve seat portion 7, The connection between the valve seat portion 7 and the valve seat portion holding portion 8 is performed by the screwing portion 11, and An engaging portion 12 is formed at the end so that it can be rotated by a wrench or the like. . The relative position of the valve seat part 7 with respect to the valve seat part holding part 8 is determined by the engagement of the valve seat part 7 with the engaging part 12. It is arbitrarily determined by rotating it, and the determined relative position is locked by the lock nut. Fixed by g. Although not shown, the engaging portion 12 and the lock To protect the nut 13 parts, place a protective cap over these parts. It is good to kick.       [0011]   A piston valve 14 is connected to the cylinder portion 2 as shown in the figure. Piston valve 14 Has a hollow cylindrical shape, and the valve section 15 on the high pressure side (upper end in the figure) is Inside Day 1, it faces the valve seat 10. The piston valve 14 has a high The low pressure side, which is the opposite side of the pressure side, should have a diameter larger than the diameter of the valve section 15. The enlarged portion 16 is formed, and the lower surface thereof forms the enlarged pressure receiving surface.       [0012]   Further, a coil spring 17 is provided between the cylinder portion 2 and the piston valve 14, The coil spring 17 elastically presses the piston valve 14 downward, and the piston valve 14 is in a standby state (use In the state (not inside), it is brought into contact with the low pressure side body 3. Of the cylinder part 2 To make the space between the cylinder part 2 and the piston valve 14 have the same pressure as the outside air on the side part. A through hole 18 is provided in the. Between the inner wall of the cylinder part 2 and the outer wall of the piston valve 14, O Rings 19 and 20 are provided.       [0013]   In addition, the projecting edge portion 21 of the piston valve 14 engages with the cylinder portion 2, and The enlarged portion 16 of the valve 14 is engaged with the projecting edge portion 22 of the cylinder portion 2 so that the piston valve A stopper for the upward movement of 14 is formed.       [0014]   The low pressure side body 3 is provided with a chamber 23 on the side facing the piston valve 14, and the chamber 23 is provided in the chamber 23. A low pressure side connection port 24 is provided so as to communicate with each other.       [0015]   The operation of the pressure reducing valve configured as described above will be described.       [0016]   The fluid that has flowed in from the high pressure side connection port 6 is transferred from the piston valve 14 facing the disc-shaped valve seat 10. From the upper end, it passes through the inside of the piston valve 14 and reaches the enlarged pressure receiving surface on the low pressure side, It flows out from the force side connection port 24. In this flow, the pressure on the high pressure side of the piston valve 14 Load due to fluid pressure received at the surface and expanded pressure reception on the low pressure side of the piston valve 14. A thrust force corresponding to the difference between the load force due to the fluid pressure received at the surface and the load force is received.       [0017]   Each of the above thrusts is proportional to the area of the pressure receiving surface and is lower than the pressure receiving surface on the high pressure side. Since the pressure receiving surface on the side has a larger area, the piston valve 14 It receives a thrust force (valve closing force) that goes in the direction of body flow.       [0018]   Then, the piston valve 14 is moved in the same direction as the fluid flow by the coil spring 17. Since the valve opening force is received due to the elastic pressure, the balance between the valve closing force and the valve opening force The valve opening is determined, and the desired low pressure side flow is obtained regardless of the fluid pressure on the high pressure side. It can be controlled to obtain body pressure.       [0019]   That is, depending on the state of the load connected to the low pressure side, the expansion receiving downstream of the piston valve 14 When the pressure applied to the pressure surface increases, the valve opening decreases and the flow rate is limited. Is controlled so that the pressure decreases, and conversely, when the downstream load decreases, As a result of the reduced pressure applied to the enlarged pressure receiving surface, the valve opening is controlled to increase. To be done.       [0020]   In addition, the pressure to be obtained on the low pressure side is appropriate when manufacturing the strength of the coil spring 17. Can be set to a desired size. Therefore, use By selecting the coil spring 17 appropriately according to Products with various pressures and flow rates can be easily obtained.       [0021]   Furthermore, the position of the valve seat 10 should be adjusted by loosening the lock nut 13 and then using the wrench etc. It can be arbitrarily adjusted by rotating the screwing portion 11 by further rotating. Servant Therefore, when it is necessary to change and adjust the set pressure on the low pressure side according to the installation location, It can be done very easily. Particularly, in the configuration of this embodiment, the high pressure side contact The direction of the connecting port 6 and the direction of the screwing shaft of the valve seat portion 7 are perpendicular to each other, and the engaging portion 12 for adjustment is externally provided. Since the structure is pulled out to the outside, it is easy from the outside with the pressure reducing valve installed in the fluid path. Has the advantage that the position of the valve seat can be adjusted.       [0022]   FIG. 2 shows a second embodiment of the present invention useful for use when the pressure on the low pressure side is low. 2 is a cross-sectional view, and the same parts as those of the first embodiment described with reference to FIG. Numbered.       [0023]   The main difference from the first embodiment is that the pressure receiving surface on the high pressure side and the pressure receiving surface on the low pressure side are different. A large area ratio is adopted so that a large thrust can be obtained even with a small pressure. It In order to increase the area ratio, a diaphragm 25 is used instead of the enlarged portion 16 in FIG. I am using. The low pressure side body connected to the downstream portion of the cylinder portion 2 and facing it. -One end of -3 is enlarged, and the diaphragm 25 is supported by the enlarged portion. There is. The central portion of the diaphragm 25 is a collar portion 26 and a pressing plate 27 provided at the bottom of the piston valve 14. Is sandwiched between.       [0024]   As described above, since the diaphragm 25 constitutes the pressure receiving surface on the low pressure side, The pressure receiving surface can be made extremely large without increasing the weight, and can be used even at low pressure. Instead, a relatively large thrust (valve closing force) is obtained.       [0025]   The other difference from the first embodiment is that in the second embodiment, as shown in FIG. The part holding part 8 is not separable from the high pressure side body 1 and is integrally formed from the beginning. It As in the first embodiment, the valve seat holding portion 8 is removed from the high pressure side body 1 to remove the valve seat position. Although it is not possible to adjust the position with the eyes, it is necessary to adjust the parts It has the advantages of reduced number and ease of manufacture.       [0026]   FIG. 3 shows a third embodiment of the present invention in which the high pressure side connection port and the low pressure side connection port are in the same direction. It is sectional drawing which shows an example, The high pressure side body 28, the low pressure side body 29, the valve seat part 30, Pis It consists of a ton valve 31 etc.       [0027]   The high pressure side body 28 has a high pressure side connection port 32 formed at one end thereof, and the valve seat portion is formed in the middle thereof. Is formed on the other end, and a cylinder part 34 is formed on the other end. valve seat The part 30 is connected to the support part 33 by screwing so that the position can be adjusted, and the lock nut 35 is used. The adjustment position is fixed.       [0028]   One end of the low pressure side body 29 is connected to the high pressure side body 28, and the inside thereof is It constitutes the cylinder part. Further, the low pressure side connection port 39 is formed at the other end. . The piston valve 31 is inserted into the cylinder part formed on the body 28, 29, The parts are hermetically connected to each other via O-rings 36 and 37. This piston valve 31 is hollow It has a cylindrical shape, and the diameter of the inlet facing the valve seat is smaller than the diameter of the outlet, as described in the first embodiment. It is constructed so that thrust force is generated in the valve closing direction due to the difference in pressure receiving area. There is. A coil spring 38 is provided between the piston valve 31 and the high pressure side body 28. , Its elastic force opposes the thrust.       [0029]   In use, the pressure reducing valve of the third embodiment is inserted into the flow path after adjusting the position of the valve seat. To be done. This is because the inflow direction and the outflow direction of the fluid are the same, whereas in the first embodiment The second embodiment differs from the second embodiment in that the inflow and outflow directions are at right angles, but the decompression control is different. The operating principle of is the same. In the third embodiment, the inflow and outflow directions are straight, so It has the advantage that it can be molded and does not take up much space.       [0030]     [Effect of device]   As described in detail above, the present invention has a hollow cylindrical shape with end portions having different pressure receiving areas. The thrust force in the valve closing direction is obtained by the piston valve, and the thrust force is opposed to the elastic force. The thrust and the elastic force are balanced so that the pressure and the flow rate can be calculated only by the thrust and the elastic force. Since the structure is controlled, the structure is very simple and the manufacturing is easy.       [0031]   Also, select an elastic part such as a coil spring that has appropriate strength according to the application. Since it is possible to handle a wide range of pressure and flow rate control, Since it is provided outside the piston valve part, the elastic part does not affect the fluid. Do not accept.       [0032]   Moreover, the piston valve part may be a hollow cylinder, and even the valve as a whole is a delicate control part. Since the structure of is not required and the number of parts is reduced, quality control becomes easier, The product becomes more robust, the stability of operation increases, and maintenance becomes easier. Further It has a long life and is economical.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a pressure reducing valve according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a second embodiment of the present invention useful for use when the pressure on the low pressure side is low. FIG. 3 is a cross-sectional view showing a third embodiment of the present invention in which the high pressure side connection port and the low pressure side connection port are in the same direction. [Explanation of symbols] 1,28 ... High pressure side body, 2 ... Cylinder part, 3,29
… Low pressure side body, 4,5,9,19,20… O ring,
6, 32 ... High pressure side connection port, 7, 30 ... Valve seat part, 8 ... Valve seat part holding part, 10 ... Valve seat, 11 ... Screw part, 12 ... Engagement part, 13, 35 ... Lock nut, 14,31 ... Piston valve,
15 ... Valve part, 16 ... Enlarged part, 17, 38 ... Coil spring, 18, 40 ... Through hole, 21, 22 ... Projected edge part, 23 ... Chamber,
24 ... Low pressure side connection port, 25 ... Diaphragm, 26 ... Collar part, 27 ... Holding plate.

Claims (1)

[Claims for utility model registration] (1) The valve seat portion provided on the high pressure side connection port side of the body and the hollow cylindrical shape through which the fluid can pass, and the pressure receiving area of one end of the hollow cylindrical shape Is larger than the pressure receiving area at the other end, an enlarged portion is provided at one end so that the thrust acts in the valve closing direction during use, and the end with the smaller pressure receiving area faces the valve seat. However, a piston valve portion arranged so that the end with the larger pressure receiving area faces the low pressure side connection port, a cylinder portion that holds the piston valve portion in an airtight manner, and a piston valve portion provided outside the piston valve portion. A pressure reducing valve, comprising: an elastic portion that applies an elastic force that opposes the thrust force in the valve closing direction to the piston valve portion. (2) In order to adjust the relative positional relationship of the valve seat portion with respect to the cylinder portion and the piston valve portion, a screw thread is formed in each of the valve seat portion and the body and screwed to lock the adjustment position. The pressure reducing valve according to claim (1), characterized in that it is fixed by a nut. (3) They are arranged so that the axial direction of the screw part for adjusting the position of the valve seat part and the direction of the high pressure side connection port are substantially orthogonal to each other, and the head part of the screw part is located outside the body. , And the position of the valve seat can be adjusted from the outside.
The pressure reducing valve described in the item (2). (4) Any one of claims (1) to (3) of the utility model registration claim characterized in that the enlarged portion of the piston valve portion is constituted by a diaphragm. The pressure reducing valve described in.