JP5214504B2 - Pressure reducing valve - Google Patents

Description

The present invention relates to a pressure reducing valve which is attached to a steam or compressed air piping system and maintains an outlet side pressure at a desired set pressure lower than an inlet side pressure.

A conventional pressure reducing valve is disclosed in Patent Document 1, for example. This is because an inlet and an outlet are formed in the valve casing, a valve seat that opens the valve port that connects the inlet and the outlet is fixed to the valve casing, and the valve body that opens and closes the valve port is formed by a valve body spring below the valve port. The valve body is arranged to be biased in the valve closing direction, and the valve body is driven by a pressure responsive member that is displaced based on the deviation between the outlet side pressure and the setting force of the pressure setting member, A cylindrical filter surrounding the valve spring is arranged between the valve seat and the bottom of the valve casing.

JP 2004-78422 A

The conventional pressure reducing valve does not allow foreign matters such as dust, rust, and scale flowing in from the inlet to be captured by the filter and flow down to the secondary side. There was a problem that it had to be disassembled.

Therefore, the problem to be solved by the present invention is to provide a pressure reducing valve that can eliminate foreign matter captured by a filter without disassembling the pressure reducing valve.

In order to solve the above problems, the pressure reducing valve of the present invention forms an inlet and an outlet in a valve casing, fixes a valve seat that opens a valve opening communicating the inlet and the outlet to the valve casing, and opens and closes the valve opening. The valve body to be driven is arranged in the valve closing direction by a valve spring under the valve opening, and the valve body is driven by a pressure responsive member that is displaced based on the deviation between the outlet side pressure and the set force of the pressure setting member. A pressure reducing valve that opens and closes the valve port, in which a cylindrical filter surrounding the valve body and the valve body spring is disposed between the valve seat and the bottom of the valve casing. The foreign material exclusion member that is in sliding contact with the periphery is screw-coupled so as to be able to advance and retract. The valve body spring is disposed between the foreign material exclusion member and the valve body, the foreign material exclusion hole is provided in the filter, and the foreign material exclusion member communicates outside the system. When a foreign substance exclusion passage is provided and the foreign substance exclusion member is advanced by a screw, the valve Is characterized in that to compress the spring communicating foreign object removing passage of foreign object removing hole and the foreign matter removing member of the filter closes the valve port in the valve body.

According to the present invention, the foreign matter captured by the filter when the foreign matter removing member is advanced by screw is wiped out to the outside, and the removed foreign matter is removed from the foreign matter removing hole of the filter together with the fluid from the inlet. Therefore, the foreign matter captured by the filter can be eliminated without disassembling the pressure reducing valve.

It is sectional drawing of the state which retracted the foreign material exclusion member of the pressure-reduction valve concerning embodiment of this invention. It is sectional drawing of the state which advanced the foreign material exclusion member of the pressure-reduction valve concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. The valve casing of the pressure reducing valve includes a main body 1 and a lid 2 fastened to the main body 1. A coil-shaped pressure setting spring 3 as a pressure setting member and a bellows 4 as a pressure responsive member are disposed between the upper portion of the main body 1 and the lid 2. An inlet 5 and an outlet 6 are formed in the main body 1, a valve seat 7 is fixed between the inlet 5 and the outlet 6, and the inlet 5 and the outlet 6 are communicated with each other through a valve port 8 formed in the valve seat 7. A valve body 9 for opening and closing the valve port 8 is disposed below the valve port 8. A substantially conical concave surface 10 is formed on the upper surface of the valve body 9. An operating rod 11 is disposed above the valve body 9. A substantially hemispherical convex surface 12 is formed on the lower end surface of the operation rod 11. The hemispherical convex surface 12 of the operating rod 11 is brought into contact with the conical concave surface 10 of the valve body 9. The upper end of the operation rod 11 is accommodated in the accommodation hole 14 of the lower spring receiver 13. The upper portion of the operation rod 11 is guided by a guide hole 17 of a guide member 16 fixed to the main body 1 by a snap ring 15 so as to be slidable up and down. A communication hole 18 for introducing the outlet 6 side pressure is formed in the guide member 16.

Between the valve body 9 and the bottom of the main body 1, a coiled valve body spring 19 that urges the valve body 9 in the valve closing direction is disposed. A cylindrical filter 20 is disposed around the valve body 9 and the valve body spring 19. The filter 20 is sandwiched and fixed between a tapered surface 21 formed on the lower end surface of the valve seat 7 and expanding upward and the bottom of the main body 1. An adjustment screw 23 is attached to the ceiling wall of the lid 2, and the lock nut 24 is used to prevent rotation. A snap ring 25 is attached to the lower part of the adjusting screw 23 to prevent it from coming out. The inner end of the adjusting screw 23 is in contact with the upper end of the pressure setting spring 3 via the sphere 26 and the upper spring receiver 27. The lower end of the pressure setting spring 3 is in contact with the upper end of the lower spring receiver 13. The upper end of the bellows 4 is fixed to a ring-shaped attachment member 28 fixed between the lid 2 and the main body 1, and the lower end is fixed to the outer periphery of the lower spring receiver 13 and closed.

A foreign body exclusion member 30 that is in sliding contact with the inner periphery of the filter 20 is screwed to the bottom of the main body 1 so as to be able to advance and retreat, and a valve body spring 19 is disposed between the foreign body exclusion member 30 and the valve body 9. A foreign substance exclusion hole 31 is provided in the lower part of the filter 20 and a foreign substance exclusion passage 32 communicating with the foreign substance exclusion member 30 outside the system is provided. As shown in FIG. 1, when the foreign object removal member 30 is screwed backward, the foreign object removal hole 31 of the filter 20 is closed by the foreign object removal member 30, and the foreign object removal passage 32 of the foreign object removal member 30 is closed by the main body 1. The valve body spring 19 functions as a pressure reducing valve that enters a normal compression state and maintains the outlet side pressure at a desired set pressure lower than the inlet side pressure. As shown in FIG. 2, when the foreign object removal member 30 is advanced by a screw, the valve body spring 19 is further compressed and the valve port 8 is closed by the valve body 9, and the foreign object removal hole 31 of the filter 20 and the foreign object removal of the foreign object removal member 30 are removed. The foreign substance exclusion state in which the passage 32 is communicated is established.

The operation of the pressure reducing valve is as follows. Usually, as shown in FIG. 1, the foreign object exclusion member 30 is used with the screw retracted. When the pressure on the outlet 6 side is lower than the set pressure, the bellows 4 is expanded by the spring force of the pressure setting spring 3 and the valve body 9 is moved downward via the operation rod 11 against the spring force of the valve body spring 19. The valve port 8 is opened by being displaced. Due to the opening of the valve port 8, the high-pressure fluid on the inlet 5 side is supplied to the outlet 6 side, and the pressure on the outlet 6 side is restored. When the pressure on the outlet 6 side recovers to a desired value, the bellows 4 contracts and returns to the original position, and the valve body 9 closes the valve port 8 by the spring force of the valve body spring 19. In order to remove the foreign matter captured by the filter 20, the foreign matter removal member 30 is advanced by a screw as shown in FIG. When the foreign object removing member 30 is advanced by a screw, the foreign object captured by the filter 20 is wiped out to the outside. It is excluded from the system through the foreign substance exclusion passage 32.

The present invention can be applied to a pressure reducing valve that is attached to a steam or compressed air piping system and maintains the outlet side pressure at a desired set pressure lower than the inlet side pressure.

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Pressure setting spring 4 Bellows 5 Inlet 6 Outlet 7 Valve seat 8 Valve port 9 Valve body 19 Valve body spring 20 Filter 30 Foreign substance exclusion member 31 Foreign substance exclusion hole 32 Foreign substance exclusion passage

Claims (1)

An inlet and outlet are formed in the valve casing, the valve seat that opens the valve port that connects the inlet and outlet is fixed to the valve casing, and the valve body that opens and closes the valve port is closed by a valve spring under the valve port A pressure reducing valve that opens and closes the valve port by driving the valve body by a pressure responsive member that is displaced based on a deviation between the outlet side pressure and the set force of the pressure setting member, A cylindrical filter that surrounds the valve body spring is disposed between the valve seat and the bottom of the valve casing, and a foreign substance exclusion member that is in sliding contact with the inner periphery of the filter is screwed to the bottom of the valve casing so as to be able to advance and retract. When a valve body spring is arranged between the foreign body exclusion member and the valve body, a foreign body rejection hole is provided in the filter and a foreign body exclusion passage communicating with the outside of the system is provided in the foreign body exclusion member, and the foreign body exclusion member is advanced by a screw. The valve spring is compressed to close the valve opening and fill Pressure reducing valve, characterized in that communicating the foreign object removing passage of foreign object removing hole and foreign object removing member.

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