JP2007048130A - Pressure reducing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure reducing valve that can prevent an operating rod from inclining by preventing the lower portion of the operating rod from being displaced from a groove in a valve element even upon chattering or the like. <P>SOLUTION: A valve casing is formed of a body 1 and a cover 2. The body 1 has an inlet 5 and an outlet 6, the body 1 is mounted with a valve seat 7 with a valve orifice 8 for making the inlet 5 and the outlet 6 communicate with each other, and the valve element 9 for opening and closing the valve orifice 8 is positioned under the valve orifice 8 as loaded in the valve closing direction by a valve element spring 19. The valve element 9 is driven via the operating rod 11 to open and close the valve orifice 8 by a bellows 4 displaced on the basis of the deviation of pressure at the outlet 6 from the set force of a pressure setting spring 3. The upper portion of the operating rod 11 is vertically slidably guided by a guide member 16. The lower portion of the operating rod 11 is positioned in the groove 10 cut in the valve element 9. The depth of the groove 10 in the valve element 9 is set larger than the stroke of the valve element 9 from full closing to full opening, and the lower portion of the operating rod 11 is vertically slidably guided by the groove 10 in the valve element 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

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, for example, Japanese Patent Application Laid-Open No. 2004-78421. What is shown here forms an inlet and an outlet in the valve casing, attaches a valve seat that opens the valve port that connects the inlet and the outlet to the valve casing, and places a valve body that opens and closes the valve port below the valve port. The valve is opened and closed by driving the valve body via the operating rod by a pressure-responsive member that is displaced by a spring and is displaced based on the deviation between the outlet pressure and the set force of the pressure setting member. In this case, the upper part of the operating rod is guided by a guide member so as to be slidable up and down, and the lower part of the operating rod is arranged in a concave groove provided in the valve body.

The conventional pressure reducing valve is superior in that the operation bar can be prevented from being tilted because the upper and lower parts of the operation bar are guided by a guide member and a valve body, respectively. However, if chattering or the like causes the valve body to repeatedly open and close, the valve body cannot follow the displacement of the operating rod, the lower portion of the operating rod comes out of the concave groove of the valve body, and the operating rod tilts. was there.
JP 2004-78421 A

  The problem to be solved is to provide a pressure reducing valve that prevents tilting of the operating rod without causing the lower portion of the operating rod to come out of the concave groove of the valve body even if chattering or the like occurs.

  The technical means of the present invention devised to solve the above technical problem is that a valve seat having an inlet and an outlet formed in a valve casing and having a valve opening communicating with the inlet and the outlet is attached to the valve casing. A valve body that opens and closes the opening is urged below the valve opening by a spring in the valve closing direction, and the operating rod is moved 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 by driving the valve body through the guide member, and guides the upper part of the operation rod up and down with a guide member, and the lower part of the operation rod in a concave groove provided in the valve body In the arrangement, the depth of the concave groove of the valve body is formed larger than the displacement distance from the fully closed to full open of the valve body, and the lower part of the operation rod is guided slidably up and down by the concave groove of the valve body. The pressure reducing valve is characterized in that.

  In the present invention, the depth of the recessed groove of the valve body is formed larger than the displacement distance from the fully closed to fully opened position of the valve body, and the lower part of the operation rod is guided slidably up and down by the recessed groove of the valve body. Therefore, even if chattering or the like occurs, the lower portion of the operating rod does not come out of the concave groove of the valve body, and an excellent effect that the operating rod can be prevented from being tilted is produced.

  In the present invention, the upper part of the operating rod is guided by the guide member so as to be slidable up and down, and the lower part of the operating rod is disposed in the concave groove provided in the valve body. It is formed to be larger than the displacement distance from the fully closed body to the fully opened body, and the lower part of the operating rod is guided by the concave groove of the valve body so as to be slidable up and down. Therefore, even if the valve body repeatedly opens and closes due to chattering or the like, and the valve body cannot follow the displacement of the operating rod, the lower portion of the operating rod does not come out of the concave groove of the valve body, and the operating rod can be prevented from tilting. .

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). FIG. 1 is a sectional view of an embodiment of a pressure reducing valve according to the present invention. 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 concave groove 10 is formed in the valve body 9, and a substantially conical concave surface 10 a is formed in the lower part of the concave groove 10. An operation rod 11 is disposed above the valve body 9. The lower part of the operating rod 11 is guided by the concave groove 10 of the valve body so as to be slidable up and down. A substantially hemispherical convex surface 12 is formed on the lower end surface of the operation rod 11 and is brought into contact with the conical concave surface 10 a 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 wall 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 screen 20 is disposed around the valve body 9 and the valve body spring 19. The screen 20 is fixed by being sandwiched between a tapered surface 21 formed on the lower end surface of the valve seat 7 and expanding upward and a stepped portion 22 formed on the bottom wall 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.

  Next, the operation of the above embodiment will be described. When the pressure on the outlet 6 side is lower than the set pressure, the bellows 4 is contracted 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 expands 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.

It is sectional drawing of the Example of the pressure reducing valve by this invention.

Explanation of symbols

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 10 Groove 10a Concave surface 11 Operation rod 12 Convex surface 16 Guide member 17 Guide hole 19 Valve body spring

Claims (1)

An inlet and outlet are formed in the valve casing, a valve seat that opens the valve port that connects the inlet and outlet is attached to the valve casing, and the valve body that opens and closes the valve port is energized in the valve closing direction by a spring below the valve port A pressure reducing member that opens and closes the valve port by driving a valve body through a control rod 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, When the upper part of the rod is slidably guided up and down by the guide member and the lower part of the operating rod is placed in the concave groove provided in the valve body, the depth of the concave groove of the valve body is determined from the fully closed state of the valve body. A pressure reducing valve, which is formed to be larger than a displacement distance to a fully open position, and the lower part of an operation rod is guided by a concave groove of a valve body so as to be slidable up and down.

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