JP2525706Y2 - Remote control type pressure reducing valve - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is composed of a main valve, a pilot section, and a drive section. The drive section receives a supply pressure controlled from the pilot section, The present invention relates to a remotely operated pressure-reducing valve which opens and closes a main valve, maintains a substantially constant secondary pressure, and remotely controls the set pressure.

<Prior art> Generally, the pilot operated pressure reducing valve is installed on the back of the equipment, so to change the set pressure, the person operating the equipment goes to the pressure reducing valve and turns the operating handle. It is necessary to rotate, and the operation of changing the set pressure is very troublesome. In particular, in the case of rubber vulcanization-related press equipment, the vulcanization temperature is often changed depending on the product to be produced, and if remote control can be performed even locally, the operation is simplified and productivity is improved.

In order to solve the above-mentioned problem, if an attempt is made to remotely control an operating handle that rotates when the set pressure is changed by using an electric motor or the like, it becomes expensive and requires electric wiring.

Therefore, the present applicant utilizes a control fluid such as air which can be used freely in a factory without using electricity as shown in FIG. 5 to utilize the original function of the pressure reducing valve and reduce the pressure to enable remote control. A valve is disclosed (see Japanese Utility Model Laid-Open No. 2-14108).

As shown in the figure, the remote control type pressure reducing valve has a pressure sensitive element chamber including a pressure sensitive element (bellows) 19 facing a pilot valve rod 17 and a space inside the pressure sensitive element 19 in a pilot portion B.
A secondary pressure detecting hole 21 for connecting the pressure sensing element 20 to the outlet 3, and an adjusting spring 22 facing the pressure sensing element 19 on the opposite side of the pressure sensing element chamber 20;
And a control fluid chamber R for applying a control force in the same direction as the adjustment spring 22 is formed.

5, A is a main valve portion, C is a drive portion, 1 is a casing, 2 is an inlet, 4 is a main valve hole, 5 is a main valve seat, 6 is a main valve, 7 is a main spring, 8 Is the main valve stem, 9 is the piston chamber,
10 is a piston, 11 is a primary pressure introduction hole, 12 is a pilot chamber,
13 is a pilot case, 14 is a valve hole, 15 is a pilot valve, 16 is a pilot spring, 18 is an outlet hole, 19a is a bellows pressure receiving face plate, 23 is an adjusting spring pressure adjusting screw rod, 24
Is a nut, 25 is an operation handle, 26 is a screen, 28 is a spring stay, and 31 is a control fluid supply port.

<Problem to be Solved by the Invention> The remote control type pressure reducing valve shown in FIG. 5 controls the secondary pressure by controlling the fluid pressure to the control fluid chamber R, and further includes an adjusting spring incorporated therein. twenty two
To guarantee the minimum set pressure. Therefore, for example, when this remote control type pressure reducing valve is used in a device that requires two kinds of pressures, the pressure can be easily switched by turning on and off the air. And workability can be greatly improved.

However, in the conventional remote-operated pressure reducing valve, the bellows 19 that separates the pressure-sensitive element, in this example, the control fluid chamber R and the pressure-sensitive element chamber 20 is made of a very thin metal because of its mechanism. If the bellows 19 is damaged by the pressure or if the gasket that seals the bellows 19 has a bad seal, the high-temperature and high-pressure steam in the bellows chamber 2 flows into the control fluid chamber R, and the control side air piping and the control valve are blocked. May cause damage. It is needless to say that a similar result is obtained even if a diaphragm or the like is used as a pressure-sensitive element instead of the bellows.

In view of the above, the present invention provides a remote control that can minimize damage to the control-side fluid piping and control valve even if the pressure-sensitive element is damaged and high-temperature fluid flows back into the control fluid chamber. The purpose is to provide a type pressure reducing valve.

<Means for Solving the Problem> As shown in FIGS. 1 to 4, the problem solving means according to the first aspect of the present invention receives a supply pressure controlled from a pilot portion B by a driving portion C and a main valve portion. The main valve 6 of A is opened and closed to maintain the pressure on the secondary side substantially constant. The pilot portion B includes a pressure-sensitive element 19 facing the pilot valve stem 17 and a pressure-sensitive element 19. A secondary pressure detecting hole 21 for connecting the pressure-sensitive element chamber 20 composed of a partitioned space to the outlet 3 and an adjustment spring 22 facing the pressure-sensitive element 19 on the side opposite to the pressure-sensitive element chamber 20 are provided. In a remote control type pressure reducing valve having a control fluid chamber R for applying a control force in the same direction as the adjusting spring 22, a thermostatic valve T is incorporated in a control fluid supply port 31 of the control fluid chamber R. is there.

According to a second aspect of the present invention, there is provided a thermo-shake valve T according to the first aspect, wherein a thermo-shake valve seat 45 and a thermo-shake valve element which is detachably seated on the thermo-shake portion seat 45.
46, a heat-sensitive responsive element 47 which is arranged closer to the control fluid outlet 43 than the thermo-shear valve 46 and expands and transforms in the valve-closing direction when a high-temperature fluid flows in, and a biasing member for urging the thermo-shear valve 46 in the valve-opening direction. A biasing means 48 and a regulating body 49 disposed between the thermo-shear valve 46 and the control fluid outlet 43 for restricting the movement of the thermo-shear valve 46 in the valve opening direction are provided.

<Operation> In the means for solving the above problems, when a bellows is used as the pressure-sensitive element 19, when the control fluid is supplied to the pressure reducing valve for changing the set pressure of the pressure reducing valve, the control fluid is controlled from the control fluid supply port 31. Enters into the fluid chamber R, and receives the pressure receiving face plate of the bellows 19.
Press 19a.

Then, on the pressure receiving face plate 19 a of the bellows 19, a force obtained by adding the pressing force of the control fluid to the acting force of the adjusting spring 22 acts, the bellows 19 contracts, and the pilot valve 15 is moved via the pilot valve rod 17. Open the valve.

As a result, the high-pressure fluid led from the primary pressure outlet hole 11 through the outlet hole 18 flows into the piston chamber 9 and opens the main valve 6, so that the outlet 3 on the secondary side of the remote control type pressure reducing valve is opened. The set pressure is changed to the higher one. As a result, the force for expanding the bellows 19 due to the secondary pressure increases, and the valve opening is determined so as to balance the resultant force of the control fluid pressure and the acting force of the adjustment spring 22.

At this time, if it is a steady state, in the thermo-shake valve T incorporated in the control fluid chamber R, the urging means 48 overcomes the heat-sensitive responsive body 47 and pushes the thermo-shake valve 46 in the valve opening direction. At that time, since the movement of the thermo-shear valve 46 in the valve opening direction is regulated by the regulating body 49, the passage of the control fluid is secured.

Then, as soon as an abnormality occurs and the high-temperature fluid flows into the thermostatic valve T, the thermal responsive element 47 expands and deforms in the valve closing direction, and the thermostatic valve element 46 is seated on the thermostatic valve seat 45 to reach the valve closing. .

<First Embodiment> A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG.

FIG. 1 is a cross-sectional view of the remote control type pressure reducing valve of the first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the thermostatic valve, and FIG. 3 is a piping of a system using the remote control type pressure reducing valve of the present invention. FIG. The same functional components as those of the prior art shown in FIG. 5 are denoted by the same reference numerals.

As shown in the figure, the remote control type pressure reducing valve of the present embodiment comprises a main valve portion A, a pilot portion B and a driving portion C. The supply pressure controlled by the pilot portion B is received by the driving portion C. The main valve 6 of the section A is opened and closed to maintain the secondary pressure substantially constant.

As shown in FIG. 1, the main valve portion A includes a main valve seat 5 having a main valve hole 4 at an intermediate position between an inlet 2 and an outlet 3 formed in a casing 1, and a main valve opening and closing the main valve hole 4. It comprises a valve 6 and a main spring 7 for urging the main valve 6 to the closing side.

The drive section C includes a main valve rod 8 that moves the main valve element 6 to the open side.
And a piston 10 integrally formed therewith and housed in the piston chamber 9.

The pilot portion B includes a primary pressure introducing hole 11 connected to the inlet 2, a pilot chamber 12 connected thereto, a pilot valve hole 14 formed in a pilot case 13, and a pilot valve for opening and closing the valve hole 14. 15, a pilot spring 16 for urging the valve element 15 in the closing direction, a pilot valve stem 17 formed separately from the valve element 15, the valve hole 14, and the piston chamber 9.
, A pressure-sensitive element (metal bellows) 19 interlocked with the pilot valve stem 17, and a pressure-sensitive element chamber (bellows chamber) 20 and the outlet 3 connected from the inner space of the bellows 19. A secondary pressure detecting hole 21, an adjusting spring (bellows spring) 22 provided in the bellows 19, an adjusting spring pressure adjusting screw rod 23, and a screw which is fitted inside the case 13 so as to be non-rotatable and linearly movable inside the case 13. It comprises a nut 24 screwed to the rod 23 and an operation handle 25 fixed integrally with the screw rod 23.

The cylindrical sliding portion of the pilot valve stem 17 is fitted inside the pilot case 13 with a small gap.

Further, a control fluid chamber R for applying a control force in the same direction as the bellows spring 22 to the pressure receiving face plate 19a of the bellows 19 is formed in a side opposite to the bellows chamber 20 with respect to the bellows 19, that is, in a space outside the bellows 19, A thermocheck valve T is incorporated in the control fluid supply port 31 of the fluid chamber R.

As shown in FIG. 2, the thermo-tick valve T includes a body 42 having a control fluid inlet 41 formed therein and a control fluid outlet 43
In a space (valve hole) formed by a combination with a cover 44 formed with a cover, a thermo-check valve seat 45 provided at a terminal position of the control fluid inlet 41 of the body 42, and a thermo-check valve which detaches and seats on the thermo-check valve seat 45. The valve 46 and the control valve outlet 43 are located closer to the control fluid outlet 43 than the thermo-shear valve 46 and have no effect when normal air or the like passes therethrough. When a high-temperature fluid (high-temperature steam) flows in, the valve closes (control fluid inlet 41). Side), and a biasing means (bias) for biasing the thermo-check valve 46 mounted in the control fluid inlet 41 in the valve opening direction (the control fluid outlet 43 side). Spring) 48, between the control fluid outlet 43 and the thermostatic valve 46, that is, the control fluid outlet of the cover 44.
A regulating body (stopper) 49 is formed so as to protrude from the terminal position of 43 toward the thermo-shear valve 46 side and to restrict the movement of the thermo-shear valve 46 in the valve opening direction.
The heat-sensitive responsive body 47 is externally fitted to the regulating body 49. In FIG. 2, reference numeral 50 denotes a conduction hole.

The control fluid supply port 31 of the control fluid chamber R is connected to a remote control fluid supply / discharge device 32 via a thermocheck valve T as shown in FIG.

As an example, the supply / discharge device 32 includes a control fluid pipe (compressed air pipe) 36 of a factory, a control fluid pressure reducing valve 33 with a relief valve attached thereto, and a safety valve 34,
The outlet pipe 35 is connected to the inlet 31 of the control fluid chamber R. The outlet side pressure of the control fluid pressure reducing valve 33 is manually set, and regardless of the quality of the pressure reducing valve 33,
The safety valve 34 is used for pipe safety. On the outlet side of the control fluid pipe 36, a switching valve 38 capable of supplying, stopping and discharging the control fluid is provided. In FIG. 3, reference numeral 37 denotes a steam consuming device connected to the outlet side of the remote control type pressure reducing valve, and V denotes a remote control type pressure reducing valve.

In the above configuration, when the control fluid is supplied to the pressure reducing valve by the control fluid supply / discharge device 32 for changing the set pressure of the pressure reducing valve, the control fluid enters the control fluid chamber R from the supply port 31 and is controlled by the pressure sensitive element. A pressure receiving face plate 19a of a bellows 19 is pressed.
At this time, in order to maintain the control fluid chamber R at a predetermined pressure,
The control fluid is continuously supplied from the supply / discharge device 32.

Then, on the pressure receiving face plate 19 a of the bellows 19, a force obtained by adding the pressing force of the control fluid to the acting force of the adjusting spring 22 acts, the bellows 19 contracts, and the pilot valve 15 is moved via the pilot valve rod 17. Open the valve.

As a result, the high-pressure fluid (steam) led from the primary pressure outlet hole 11 through the outlet hole 18 flows into the piston chamber 9 and opens the main valve 6, so that it is on the secondary side of the remote control type pressure reducing valve. The set pressure at the outlet 3 is changed to a higher pressure. As a result, the force for extending the bellows 19 due to the secondary pressure increases, and the valve opening is determined so as to balance the resultant force of the control fluid pressure and the acting force of the adjustment spring 22.

In addition, even if the switching valve 38 is not provided, if the setting pressure of the pressure reducing valve 33 is reset in a lowering direction, the relief valve incorporated therein automatically operates to discharge the control fluid in the control fluid chamber R.

At this time, in a steady state, in the thermo-tick valve T incorporated in the control fluid chamber R, the urging means 48 overcomes the heat-sensitive responsive element 47 and moves the thermo-tick valve element 46 in the valve opening direction (the control fluid outlet 43 side). Push. At that time, the thermo-chuckle valve 46
The movement of the valve in the valve opening direction is regulated by the regulating body 49, and the passage of the control fluid is secured by the conduction hole 50 provided in the periphery thereof.

Then, as soon as an abnormality occurs and the high-temperature fluid (high-temperature steam) flows into the thermo-check valve T, the heat-sensitive responsive element 47 expands and deforms in the valve closing direction (the control fluid inlet 41 side), causing the thermo-check valve 46 to move. The valve is brought into contact with the thermoshear valve seat 45 and the valve is closed.

As described above, the thermo-shake valve seat 45, the thermo-shake valve element 46 which is detachably seated on the thermo-shake valve seat 45, and the heat-sensitive responsive element 47 which elongates and transforms in the valve closing direction when a high-temperature fluid flows in.
A thermo-shake valve T having a biasing means 48 for biasing the thermo-shear valve 46 in the valve opening direction and a regulating body 49 for restricting the movement of the thermo-shear valve 46 in the valve opening direction. By incorporating the control fluid supply port 31, the bellows or the like, which is a pressure sensing member, is broken, and if the high-temperature fluid flows back into the thermo-check valve T, the thermo-check valve T can be closed. Therefore, it is possible to minimize damage to the fluid piping and the control valve on the control side, and it is possible to perform piping without making significant improvements to the device.

Note that the configuration of the remote operation referred to here can control a pressure equal to or higher than a value initially set by an operation handle of the pressure reducing valve in order to utilize the function of the pressure reducing valve itself. In other words, three atmospheres are set in the supply / discharge device 32, and the supply pressure of the control fluid is given to the control fluid chamber R to increase the pressure. As a result, the control fluid chamber R becomes three atmospheres, and can be used without operating the operation handle. Of course, switching valve
By switching 38 to the discharge position and discharging the control fluid from the control fluid chamber R, the secondary pressure returns to the setting of only the adjustment spring.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 4 is an enlarged sectional view of a thermo-check valve of the remote control type pressure reducing valve according to the second embodiment of the present invention.

As shown in the figure, the remote control type pressure reducing valve of the present embodiment is configured such that a thermostatic valve element 46 is provided with a valve element having a piston 51, and a thermosensitive element 47 is provided.
The first embodiment differs from the first embodiment in that a thermowax is used, and the thermowax is supported on the regulating body 49 and an overstress prevention spring having an overwhelmingly large spring constant is used as compared with the biasing means 48. Same as the example.

Therefore, the operation and effect are the same as those of the first embodiment.

It should be noted that the present invention is not limited to the above embodiment, and it is needless to say that many modifications and changes can be made to the above embodiment within the scope of the present invention.

<Effects of the Invention> As is apparent from the above description, according to the present invention, a thermo-shearing valve seat, a thermo-shearing valve element that is detachably seated on the thermo-shearing valve seat, and a heat-sensitive responsive element that elongates and transforms in the valve closing direction when a high-temperature fluid flows in. A thermo-shake valve having a biasing means for biasing the thermo-shear valve in the valve opening direction, and a regulating body for restricting the movement of the thermo-shear valve in the valve opening direction, into the control fluid supply port of the control fluid chamber. In a steady state, the thermo-shear valve pushed in the valve opening direction by the urging means is regulated by the regulating body to restrict the movement in the valve opening direction to secure a passage for the control fluid. The responsive element extends and transforms in the valve closing direction, and the thermo-shake valve seat is seated on the thermo-shake valve seat to close the valve.

Therefore, if the pressure sensing element is damaged and the high-temperature fluid flows back into the thermo-check valve, the thermo-check valve can be closed, minimizing damage to the control-side fluid piping and control valve. It is difficult to limit,
In addition, there is an excellent effect that piping can be performed without making significant improvements to the apparatus.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the remote control type pressure reducing valve of the first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the thermostatic valve, and FIG. 3 is a steam consumption using the remote control type pressure reducing valve of the present invention. FIG. 4 is an enlarged sectional view of a thermo-check valve according to a second embodiment of the present invention, and FIG. 5 is a sectional view of a conventional remote-operated pressure reducing valve. 3: Outlet, 6: Main valve, 18: Pilot valve stem, 19: Bellows (pressure sensing element), 19a: Pressure receiving face plate, 20: Bellows chamber (pressure sensing element chamber), 21: Secondary pressure detection hole, 22 : Bellows spring (adjusting spring), 31: control fluid supply port, 41: control fluid inlet, 43: control fluid outlet, 45: thermo-shear valve seat, 46: thermo-shear valve, 47: thermosensitive element, 48: biasing means , 49:
Regulator: A: main valve, B: pilot, C: drive, R: control fluid chamber, T: thermostatic valve.

Claims (2)

(57) [Scope of request for utility model registration] A driving unit receives a supply pressure controlled from a pilot unit, opens and closes a main valve element of a main valve unit, and keeps a secondary pressure substantially constant. A pressure sensing element facing the pilot valve stem, a pressure sensing element chamber formed of a space partitioned by the pressure sensing element, and a secondary pressure detection hole connecting the outlet, and a pressure sensing element opposite to the pressure sensing element chamber. In a remote control type pressure reducing valve having a control fluid chamber in which an adjustment spring opposed to the pressure sensing element is provided and in which a control force acting in the same direction as the adjustment spring is formed, a thermo-check valve is provided at a control fluid supply port of the control fluid chamber. A remote control type pressure reducing valve characterized by incorporating therein. 2. The thermo-tick valve according to claim 1, wherein the thermo-tick valve seat, a thermo-tick valve valve which is detachably seated on the thermo-tick valve valve seat, and a control fluid outlet which is disposed closer to the control fluid outlet than the thermo-tick valve valve. A heat-sensitive responsive element that elongates and transforms in the valve-closing direction, biasing means that urges the thermo-shear valve in the valve-opening direction, and a valve-opening direction of the thermo-shear valve disposed between the thermo-shear valve and the control fluid outlet. A remote-control pressure reducing valve, characterized in that it has a regulating body that regulates movement to the air conditioner.