JPH0583812U - Pressure reducing valve - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pressure reducing valve capable of easily changing a reference value for setting secondary pressure by remote control. A self-powered pressure reducing valve is provided with an auxiliary drive unit 20 for applying a reference value adjusting thrust to a valve shaft 11. By controlling the auxiliary drive unit with air or the like, a thrust for adjusting the reference value is applied to the valve shaft, and the preset reference value is easily changed by remote operation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure reducing valve used, for example, in a snowfall machine for a ski resort, a water sprinkler for a golf course, or the like when controlling the amount of water sprayed.

[0002]

[Prior Art]

 It is necessary to adjust the flow rate of the load sprinkler and shut it off depending on the weather conditions such as rain, cold and warm in the snow machines for ski resorts and sprinklers for golf courses. Therefore, conventionally, as illustrated in FIG. 3, a normal pressure reducing valve a (see FIG. 4), a shutoff valve b (see FIG. 5), and a drain valve c if necessary to prevent freezing of residual water are provided. Etc. were arranged for each spray nozzle d.

The pressure reducing valve a controls the valve opening degree by balancing the secondary pressure converted into the thrust force via the diaphragm e with the reaction force of the compression spring f for which the reference pressure is set. The set value is changed by changing the amount of compression of the compression spring f. The shutoff valve b is configured to be opened by compressing the compression spring h with compressed air introduced into the air chamber g, and to be shut off by releasing the compressed air.

[0004]

[Problems to be solved by the device]

 The spray nozzles d are generally scattered over a vast site, and the amount of water sprayed must be adjusted appropriately according to the weather conditions. Each d had to go to each installation site, which required a lot of time and effort.

The present invention has been made under the above circumstances, and the setting reference value of the secondary pressure can be easily changed by remote operation. Further, the remote control interrupting function and residual liquid are eliminated. It is an object of the present invention to provide a pressure reducing valve that also has an automatic drainage function.

[0006]

[Means for Solving the Problems]

 The present invention relates to a pressure reducing valve having a valve shaft driven by a secondary pressure so that the secondary pressure becomes equal to a set reference value, and an auxiliary drive unit for applying the reference value adjusting thrust force to the valve shaft. It is characterized by including.

[0007]

[Action]

 In the above configuration, if the auxiliary drive unit is controlled by air or the like, the reference value adjusting thrust is applied to the valve shaft, so the preset reference value can be easily changed by remote operation.

[0008]

【Example】

 The present invention will be described below with reference to the embodiment shown in FIG.

In this embodiment, a pressure reducing valve provided with a valve shaft driven by a secondary pressure so that the secondary pressure becomes lower than a reference value set lower than the primary pressure, that is, a self-powered pressure reducing valve, Mainly equipped with a remote-controllable auxiliary drive unit that applies thrust for adjusting the reference value to the valve shaft, and is also integrated with a remote-controllable shutoff function unit and automatic drainage function unit. Therefore, the main part will be described first.

In FIG. 1, a valve box 1 of a pressure reducing valve A includes a main body 2, an inner lid 3, an upper lid 4 and a bottom lid 5. The main body 2 is formed with a first chamber 7 and a second chamber 8 which are partitioned by a cylindrical partition wall 6 having a closed end and protruding inward. The partition wall 6 is provided with a main valve seat 9 and a balance seat 10 having the same opening area and concentrically facing each other.

A valve shaft 11 penetrating the main valve seat 9 and the equilibrium seat 10 concentrically is supported in the valve box 1 so as to be vertically movable. The valve shaft 11 includes a main valve body 12 located in the second chamber 8 that faces the main valve seat 9 in a contacting / separating manner, and a base end portion of which is slidably fitted, and a balance seat 10. An equilibrium plate 13 that is slidably fitted is provided so that even if the primary pressure, that is, the internal pressure of the first chamber 7, fluctuates, its influence is automatically eliminated.

The main drive unit 14 provided in the inner lid 3 includes a third chamber 15 communicating with the second chamber 8, a fourth chamber 16 communicating with the outside, and a main diaphragm partitioning these chambers 15, 16. It is equipped with 17. A peripheral portion and a central portion of the main diaphragm 17 are supported by the inner lid 3 and the valve shaft 11, respectively.

A compression spring 18 for setting a reference value is provided between the upper lid 4 and the upper end portion of the valve shaft 11 that penetrates the lid 4 and projects to the outside. The axial thrust applied to the valve shaft 11 by the compression spring 18, that is, the thrust corresponding to the set reference value of the secondary pressure is variably set via the adjusting screw 19.

The auxiliary drive unit 20 provided in the valve box 1 has an auxiliary diaphragm 21 whose peripheral portion is sandwiched between the inner lid 3 and the upper lid 4 and whose central portion is supported by the valve shaft 11. There is. The fifth chamber 22 partitioned by the auxiliary diaphragm 21 communicates with the outside, and the sixth chamber 23 has an inlet 24 for air for adjusting the reference value. Further, the lower support plate 25 of the auxiliary diaphragm 21 comes into contact with the bottom of the fifth chamber 22 so as to be freely contactable and separable, so that the opening direction movement amount of the valve shaft 11 is regulated. Next, the shutoff function section 26 and the drainage function section 27 attached to the main body portion configured as described above will be described.

The shut-off function portion 26 includes a shut-off diaphragm 28 whose peripheral and central portions are supported by the inner lid 3 and the valve shaft 11, respectively. In the seventh chamber 29, which is partitioned from the fifth chamber 22 through the diaphragm 28, an inlet 30 for shut-off air is opened. Further, at the bottom of the seventh chamber 29, the fourth chamber 16 and the seventh chamber 29 are liquid-tightly isolated, the axial impact applied to the valve shaft 11 is mitigated, and the eccentricity of the valve shaft 11 is prevented. A partition plate 31 which can be dealt with is provided so as to be displaceable in the lateral direction. The drainage function unit 27 is provided on the bottom lid 5.

That is, the drainage box 33 provided in the recess 32 of the bottom lid 5 is provided with a communication hole 34 opening to the lower part of the side wall and communicating with the recess 32, and a drainage hole 35 opening to the bottom. A drain valve seat 36 is provided on the upper edge of the drain hole 35. Further, the drainage valve 37, which is fitted in the drainage box 33 so as to be movable up and down so as to come in contact with and separate from the drainage valve seat 36, is urged in the opening direction by the compression spring 38 and is also urged by the pin 39. The displacement in the opening direction is regulated. Next, the operation of the above embodiment will be described.

If the reference value of the secondary pressure is set in the compression spring 18 via the adjusting screw 19, the valve shaft 11 is pushed down by the reaction force of the compression spring 18 in the non-flowing state, and the lower end of the support plate 25 is The main valve body 12 is stopped at a position where it abuts on the bottom of the fifth chamber 22, and the main valve body 12 is separated from the main valve seat 9 and is in the fully open state shown. That is, this embodiment is a so-called normally open type. The drain valve 37 is also separated from the drain valve seat 36 by the reaction force of the compression spring 38, and is in the fully open state shown in the figure. Therefore, when the liquid flows into the first chamber 7 in this state, most of the liquid initially flows out from the second chamber 8 through the gap between the main valve seat 9 and the main valve body 12, and the other is discharged. It flows out from the liquid hole 35 to the outside.

When the secondary pressure rises to a certain extent, the drain valve 37 is pushed down against the compression spring 38, and the drain valve seat 36 is pressed to close the drain hole 35. On the other hand, the secondary pressure flowing from the second chamber 8 into the third chamber 15 causes upward thrust to act on the valve shaft 11 via the main diaphragm 17. When this thrust increases and approaches the reaction force of the compression spring 18 corresponding to the set reference value, the main valve body 12 moves in the closing direction together with the valve shaft 11, and when the reaction force exceeds the thrust, it moves in the opening direction. .. The secondary pressure is maintained at the set reference value due to the balance between the thrust force and the reaction force.

When it is necessary to change the reference value set in the compression spring 18, if compressed air is pressed into the sixth chamber 23 from the reference value adjusting air inlet 24 of the auxiliary drive unit 20, The thrust applied to the valve shaft 11 via the auxiliary diaphragm 21 is weighted to the above-mentioned set reference value. Therefore, by appropriately setting the pressure of the compressed air, an effect substantially equivalent to that when the reference value set in advance in the compression spring 18 is replaced with a new desired value is obtained. When the compressed air in the sixth chamber 23 is released, the reference value is restored from the new desired value to the initial set reference value.

When shutting off the liquid supply, if compressed air is forced into the seventh chamber 29 from the shutoff air inlet 30 of the shutoff function section 26, it is provided to the valve shaft 11 via the shutoff diaphragm 28. The main valve body 12 is pressed against the main valve seat 9 by the thrust in the closing direction, and the first chamber 7 and the second chamber 8 are shut off from each other. As a result, when the secondary pressure decreases, the drainage valve 37 is moved in the opening direction by the reaction force of the compression spring 38 in the drainage function part 27, and the residual liquid is discharged from the drainage hole 35 to the outside through the drainage valve seat 36. To be leaked. Then, if the compressed air in the seventh chamber 29 is released after the discharge of the residual liquid is completed, the device returns to the initial state.

When the pressure reducing valve A is applied to a snowfall machine, a water sprinkler, or the like, a water supply pipe 42 connected to a water supply pump 41 is individually combined with a desired number of spray nozzles 40 as illustrated in FIG. In parallel with. Further, compressed air pipes 45 and 46 reaching the inlets 24 and 30 of the pressure reducing valve A and a spray generating air pipe 47 reaching the spray nozzle 40 are connected to the air compressor 43 via the operating portion 44. Then, the reference value set in the compression spring 18 is made to correspond to the minimum pressure of the spray nozzle 40, and for the portion exceeding this, the compressed air pressure supplied to the auxiliary drive section 20 is adjusted in the operation section 44. It will be supplemented by controlling appropriately. In addition, H in the figure shows an elevation difference.

In the above embodiment, since the auxiliary drive unit 20 and the cutoff function unit 26 capable of controlling the air pressure are integrally provided, the reference value given to the valve shaft 11 via the compressed air press-fitted into them. The adjusting and breaking thrusts can be controlled remotely. Further, since the drainage function part 27 capable of automatic drainage is also integrally provided, when the secondary pressure drops below a predetermined value after shutting off, the residual liquid in each part is automatically discharged to the outside. Moreover, the piping work at the beginning of the equipment is easy.

Therefore, even for a large number of spray nozzles 40 scattered over a vast site, the variable setting of water pressure and the shutoff of each valve can be remotely controlled all at once by the operation unit 44, and the water after shutting off can be controlled. Since it is also prevented from remaining, it is not necessary to go to the installation location of each spray nozzle d to individually operate the valve as in the above-mentioned conventional example, and the labor and time of the worker can be greatly reduced.

The present invention is not limited to the above-described embodiment, but the axial position of the main valve body 12 and the main valve seat 9 and the shut-off function portion 26 are reversed, so that the second chamber 8 It is also possible to use a back pressure valve that maintains a constant primary pressure of the liquid flowing from the direction to the first chamber 7. In addition, various modifications and applications are possible within the scope of the gist of the present invention.

[0025]

[Effect of the device]

 As described above, according to the present invention, the set reference value of the secondary pressure can be easily changed by remote control, and the shutoff function that can be remotely controlled and the automatic drainage function that can eliminate the residual liquid can be used. It is possible to provide a pressure reducing valve also provided with.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a system diagram illustrating a case where the same embodiment is applied for watering.

FIG. 3 is a unit connection diagram showing a conventional example.

FIG. 4 is a cross-sectional view illustrating a conventional pressure reducing valve.

FIG. 5 is a half-sectioned view illustrating a conventional shutoff valve.

[Explanation of symbols]

A ... Pressure reducing valve, 9 ... Main valve seat, 11 ... Valve shaft, 12 ... Main valve body,
14 ... Main drive part, 17 ... Main diaphragm, 18 ... Compression spring, 20 ... Auxiliary drive part, 21 ... Auxiliary diaphragm, 24
... Air inlet for reference value adjustment, 26 ... Shut-off function section, 27 ...
Drainage function part, 28 ... Isolation diaphragm, 30 ... Isolation air inlet, 35 ... Drainage hole, 37 ... Drainage valve, 38 ... Compression spring.

Claims (3)

[Scope of utility model registration request] 1. A pressure reducing valve having a valve shaft driven by a secondary pressure such that the secondary pressure becomes equal to a reference value set lower than the primary pressure, wherein the valve shaft has the thrust for adjusting the reference value. A pressure reducing valve, comprising: an auxiliary drive unit that applies 2. The pressure reducing valve according to claim 1, further comprising a shut-off drive unit that applies a thrust force in a valve closing direction to the valve shaft. 3. The pressure reducing valve according to claim 1, further comprising a drain valve which allows the outflow of the secondary side retained liquid when the secondary pressure drops below a predetermined value.