JP5065110B2 - Pressure reducing valve - Google Patents

Description

  The present invention relates to a pressure reducing valve that is attached to a fluid piping system such as steam, compressed air, liquid, etc., and maintains the fluid pressure on the outlet side of the valve, that is, the secondary side of the valve at a constant set pressure. It is related to what can be completely closed.

  A pressure reducing valve capable of completely closing the main valve port by the main valve body is shown in Japanese Utility Model Laid-Open No. 2-84917. The valve seat member is formed with an inlet and an outlet in the valve casing, a valve seat member having a main valve opening communicating with the inlet and the outlet is attached to the valve casing, a main valve body is disposed opposite the valve seat member, and the valve seat One end of the bellows is fixed to the main valve body side of the member, and an annular movable valve seat is fixed to the other end of the bellows so that it can be displaced and tilted in the axial direction, and a pressure receiving responsive portion based on the deviation between the outlet side pressure and the set pressure The main valve body is driven by this displacement and is seated on and away from the movable valve seat, thereby opening and closing the main valve port and maintaining the outlet side pressure at the set pressure.

In the conventional pressure reducing valve, one end of the bellows is fixed to the main valve body side of the valve seat member, and an annular movable valve seat is fixed to the other end of the bellows so as to be displaceable and tiltable in the axial direction, and set to the outlet side pressure. Since the main valve body is driven by the displacement of the pressure-responsive section based on the deviation from the pressure and is seated on the movable valve seat, the main valve port is opened and closed, and the outlet side pressure is maintained at the set pressure. Even if the valve body is tilted and seated on the movable valve seat, the valve means and the movable valve seat are brought into close contact with each other by tilting the movable valve seat appropriately if necessary according to the main valve body. It can be completely closed. However, the conventional pressure reducing valve has a problem that the bellows is abnormally contracted and damaged when a water hammer or the like occurs in the piping system and the main valve body collides with the movable valve seat. In addition, there is a problem that foreign matter in the fluid is sandwiched between the plate members of the bellows and the bellows is damaged.
2-84917

  The problem to be solved is to provide a pressure reducing valve that can prevent damage to the bellows.

  The pressure reducing valve according to the present invention has an inlet and an outlet formed in a valve casing, a valve seat member having a main valve port communicating with the inlet and the outlet is attached to the valve casing, and the main valve body is disposed facing the valve seat member. Then, one end of the bellows is fixed to the main valve body side of the valve seat member, and an annular movable valve seat is fixed to the other end of the bellows so as to be displaceable and tiltable in the axial direction, so that a deviation between the outlet side pressure and the set pressure is achieved. The main valve body is driven by the displacement of the pressure receiving responsive part based on it, and is opened / closed to the movable valve seat to open / close the main valve port and maintain the outlet side pressure at the set pressure. A stopper member is provided that extends toward the valve seat member and contacts the valve seat member when the movable valve seat is displaced by a predetermined amount in the valve seat member direction.

  The present invention provides a stopper member that extends from the movable valve seat toward the valve seat member and contacts the valve seat member when the movable valve seat is displaced by a predetermined amount in the valve seat member direction. Damage can be prevented, and an excellent effect that a good decompression function can be maintained over a long period of time is produced.

  The pressure reducing valve of the present invention is provided with a stopper member that extends from the movable valve seat toward the valve seat member and contacts the valve seat member when the movable valve seat is displaced by a predetermined amount in the valve seat member direction. is there. Therefore, when a water hammer or the like occurs in the piping system and the main valve body collides with the movable valve seat, the stopper member comes into contact with the valve seat member when the bellows contracts by a predetermined amount, so that abnormal contraction of the bellows can be prevented. The damage of the bellows can be prevented. Moreover, since the stopper member can prevent foreign matter in the fluid from being sandwiched between the plate members of the bellows, damage to the bellows can be prevented.

  An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). FIG. 1 shows the overall configuration of the pressure reducing valve of the present invention, and FIG. 2 shows the detailed configuration of the valve seat member portion of the pressure reducing valve of the present invention. An inlet 2 and an outlet 3 are formed in the valve casing 1, and a main valve port 5 is formed in a valve seat member 4 screwed to the valve casing 1. Opposing to the main valve port 5, the main valve body 6 is arranged by being biased by a coil spring 17 in the valve closing direction. One end (upper end) of the cylindrical bellows 10 is fixed to the main valve body 6 side of the valve seat member 4 by welding, and the annular movable valve seat 11 is displaced and inclined in the axial direction at the other end (lower end) of the bellows 10. Freely fixed by welding. A cylindrical stopper member 15 is integrally provided on the upper surface of the movable valve seat 11, and a communication hole 16 is provided in the stopper member 15 for communicating inside and outside. The stopper member 15 extends inside the bellows 10 from the movable valve seat 11 toward the valve seat member 4 and contacts the valve seat member 4 when the movable valve seat 11 is displaced by a predetermined amount in the valve seat member 4 direction.

  The upper end of the main valve body 6 is brought into contact with the connecting rod 8 of the piston 7. The piston chamber 9 at the upper part of the piston 7 is connected to the pilot valve chamber 14 via the communication path 13. The pilot valve chamber 14 is connected to the inlet 2 via the inlet pressure communication path 32. A pilot valve 12 that blocks communication between the inlet pressure communication path 32 and the communication path 13 is disposed in the pilot valve chamber 14 between the inlet pressure communication path 32 and the communication path 13.

  The upper end of the pilot valve 12 abuts on the center of the lower surface of the diaphragm 21 as a pressure receiving response portion. As the diaphragm 21 moves up and down, the pilot valve 12 is opened and closed to cut off the communication between the inlet pressure communication path 32 and the communication path 13. The lower chamber 30 of the diaphragm 21 is subjected to the pressure on the outlet 3 side by the outlet pressure communication passage 31. A coil spring 23 for setting pressure is arranged on the upper surface of the diaphragm 21 via a diaphragm presser 22. A pressure adjusting screw 24 is attached to the upper end of the coil spring 23 via a steel ball 25.

  The operation as a pressure reducing valve is as follows. When the pressure on the outlet 3 side becomes lower than the set pressure set by the coil spring 23, the pilot valve 12 is opened via the diaphragm 21 by the spring force of the coil spring 23, and the high pressure fluid on the inlet 2 side passes through the communication passages 32 and 13. The piston 7 passes through and acts on the upper surface of the piston 7 so that the piston 7 is displaced downward. The main valve body 6 is moved away from the movable valve seat 11 due to the displacement of the piston 7, the main valve port 5 is opened, and the high pressure fluid on the inlet 2 side is replenished to the outlet 3 side. To rise. When the set pressure is reached, the load that pushes up the diaphragm 21 and the push-down load by the coil spring 23 balances, the pilot valve 12 closes, the main valve body 6 sits on the movable valve seat 11, and the main valve port 5 closes. To do. Even if the main valve body 6 is seated on the movable valve seat 11 in a tilted state, the movable valve seat 11 is appropriately tilted according to the main valve body 6 so that the main valve body 6 and the movable valve seat 11 are tilted appropriately. Can close the main valve port 5 completely. When a water hammer or the like occurs in the piping system and the main valve body 6 collides with the movable valve seat 11, the stopper member 13 comes into contact with the valve seat member 4 when the bellows 10 contracts by a predetermined amount, and the bellows 10 contracts abnormally. Since it can prevent, damage to the bellows 10 can be prevented. Moreover, since the stopper member 13 can prevent foreign matter in the fluid from being sandwiched between the plate members of the bellows 10, damage to the bellows 1016 can be prevented.

It is a whole sectional view showing an example of a pressure-reduction valve of the present invention. It is an expanded sectional view which shows the Example of the valve-seat member part of the pressure-reduction valve of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve casing 2 Inlet 3 Outlet 4 Valve seat member 5 Main valve port 6 Main valve body 7 Piston 10 Bellows 11 Movable valve seat 15 Stopper member 21 Diaphragm

Claims (1)

A valve seat member having an inlet and an outlet formed in the valve casing and having a main valve port communicating with the inlet and the outlet is attached to the valve casing, a main valve body is disposed opposite the valve seat member, One end of the bellows is fixed to the valve body side, and an annular movable valve seat is fixed to the other end of the bellows so as to be displaced and tilted in the axial direction, and by the displacement of the pressure receiving response portion based on the deviation between the outlet side pressure and the set pressure The main valve body is driven to open and close to the movable valve seat to open and close the main valve port and maintain the outlet side pressure at the set pressure.The interior of the bellows extends from the movable valve seat toward the valve seat member. A pressure reducing valve comprising a stopper member that contacts the valve seat member when the movable valve seat is displaced by a predetermined amount in the valve seat member direction.

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