JPH04403Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a pressure reducing valve that is designed to prevent vibrations, that is, pulsations that occur during pressure reducing operations.

(b) Prior Art When a pressure reducing valve is performing a pressure reducing operation, the valve body moves repeatedly and generates vibrations, that is, pulsations. Conventional measures to prevent such pulsation include increasing the tension of the diaphragm, increasing the spring constant of the adjustment spring, making the pressure introduction port thinner, or a combination of these. Ta.

However, these conventional means have the problem that although they can change the region where pulsations occur, they cannot suppress the occurrence of pulsations in the entire region. Furthermore, these means also have the problem of deteriorating flow characteristics.

(c) Problem to be solved by the invention The problem to be solved by the invention is to suppress the movement of the valve element by pressing the valve element when the valve is opened and the pressure reduction operation starts, thereby preventing pulsation.

(d) Means for solving the problem In order to solve the above problem, the present invention includes a valve chamber, a plurality of ports communicating with the valve chamber, and a valve port that communicates the valve chamber with one of the ports. The main body and
a diaphragm having an outer circumferential portion fixed to the main body and having a fluid pressure applied to one surface and a pressing force of a spring acting on the other surface; and a diaphragm disposed within the valve chamber and connected to the diaphragm. In the pressure reducing valve, the valve body is provided with a valve body that can open and close the valve port in response to the operation of the diaphragm, and the pressing force of the spring is adjusted by an adjustment screw, and the valve body includes an elastic member and an axially extending valve body. A resin sleeve having an extending slit and a tapered portion is attached, and the main body has a tapered surface that contacts the tapered portion of the sleeve, and when the valve body moves toward the tapered surface, the taper The sleeve is configured to press the valve body by the action of the valve body and the tapered surface.

(e) Effect In the above configuration, when one of the ports is connected to a fluid pressure source to supply fluid pressure into the port and the adjusting screw is set to the set value, the diaphragm is pushed by the spring and the valve body moves, causing the valve to close. Open the port and allow fluid pressure to flow through the valve port to the other port. At this time, when the valve body moves, the sleeve is pushed by the valve body through the elastic member toward the tapered surface of the main body, so the sleeve presses the valve body due to the action of the tapered portion of the sleeve and the tapered surface, thereby preventing pulsation. When the pressure in the other ports reaches the set value, the diaphragm pushes the adjustment spring to move the valve body in the opposite direction and close the valve port.

(F) Embodiments Examples of the present invention will be described below with reference to the drawings.

1 and 2, a pressure reducing valve 1 of this embodiment is shown. The pressure reducing valve 1 has a main body 2 having a main body 21, a cap 22, and a bottom 23.
, a diaphragm 4 disposed within the main body 2 and whose peripheral portion is fixedly held between the main body portion 21 and the cap portion 22 of the main body, a diaphragm washer 41 attached to the diaphragm 4, and a diaphragm washer 41 whose position is adjusted to the cap portion. It has a spring receiver 52 supported by an adjusting screw 51 which can be screwed together, and an adjusting spring 5 disposed in the cap part in between.

The main body portion 21 has a hole 24 passing through it in the axial direction (in the vertical direction in FIG. 1) and defining the valve port 25;
Ports 26 and 27 communicating with the hole 24 and a chamber 28 formed between the diaphragm 4 and the body portion 21
a through hole 29 communicating with the port 27 and a large diameter hole 31 coaxial with the hole 24 and defining the valve chamber 30;
and a valve seat 32 surrounding the valve port.

The bottom portion 23 is screwed into a threaded portion of the large diameter hole 31. A stepped through hole 33 coaxial with the hole 24 and having a different diameter in the middle, a port 34, and a plurality of channels 35 separated in the circumferential direction around the through hole are formed in the bottom part. has been done. Through hole 24
A tapered surface 36 that widens toward the valve chamber is formed at the portion where the diameter changes.

A valve body 6 that engages with a valve seat 32 to close the valve port 25 is movably disposed within the valve chamber 30 . The valve body 6 includes a shaft portion 61 extending through the hole 24 and having an end fixed to the tire flam 4, and a shaft portion 61 extending through the hole 24.
A shaft portion 62 extending inward and a flange portion 63 between both shaft portions are formed. An annular elastic member 7 and a sleeve 8 made of a synthetic resin material such as polytetrafluoroethylene are attached to the shaft portion 62 with the elastic member facing the flange side. The sleeve 8 is formed with a slit 81 extending in the axial direction and a tapered portion 82 that contacts the tapered surface 36 formed on the bottom portion 23.

In the pressure reducing valve configured as described above, when the port 34 is connected to a fluid pressure source on the inlet side and the adjusting screw is turned to reach the set pressure to be reduced, the diaphragm 4 is pushed by the spring 5, so the valve body 6 is also pushed. It can be removed from the valve seat 32. Therefore, fluid pressure is transmitted from the valve chamber 30 through the valve port 25 to the two ports 26,
27 and further flows through the through hole 29 into the chamber 28 . When the fluid pressures in both ports 26 and 27 reach a set value, the fluid pressure in the chamber 28 pushes back the diaphragm 4, and the valve body 6 closes the valve opening or narrows the opening. Repeat this operation to connect port 2
6 and 27 are supplied with reduced fluid pressure.

In the above operation, when the valve body 6 is pushed in the direction away from the valve seat 32, that is, in the direction of the tapered surface 36, the sleeve 8 is pushed through the elastic member 7 to the tapered surface 36.
6 side, the sleeve 8 has a tapered surface 36
It is compressed in the radial direction by the action of the tapered portion 82 (because the slit 81 is formed), and presses the shaft portion 62 of the valve body. Therefore, the movement of the valve body 6 is suppressed and the slight vibrations of the valve body are damped. Therefore, pulsation of the pressure reducing valve is prevented. In this case, since the sleeve is made of a resin material, the frictional resistance is small and will not cause malfunction of the valve body.

In the above embodiment, the tapered surface is widened towards the end and the tapered part is tapered, but as shown in FIG. It may be expanded to press the annular portion 64' of the valve body 6'.

(g) Effect In this invention, the sleeve is pressed against the valve body by the action of the tapered surface of the main body and the tapered part of the sleeve, and the slight vibration of the valve body can be damped, so pulsation of the pressure reducing valve can be effectively prevented. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the pressure reducing valve of the present invention.
FIG. 2 is an enlarged perspective view of a portion of FIG. 1, and FIG. 3 is a diagram showing a modification of the tapered portion and the tapered surface. 1...Reducing valve, 2...Main body, 25...Valve port, 2
6, 27...port, 30...valve chamber, 36...tapered surface, 4...diaphragm, 5...adjustment spring,
6...Valve body, 7...Elastic member, 8...Sleeve,
81...slit, 82...tapered part.

Claims (1)

[Scope of utility model registration request] A main body having a valve chamber, a plurality of ports communicating with the valve chamber, and a valve port communicating between the valve chamber and one of the ports, and an outer peripheral portion fixed to the main body and having fluid pressure on one surface. and a diaphragm on which the pressing force of a spring acts on the other surface, and a diaphragm disposed within the valve chamber and connected to the diaphragm so that the valve port can be opened and closed in response to the operation of the diaphragm. A pressure reducing valve is provided with a valve body and the pressing force of the spring is adjusted by an adjustment screw, an elastic member and a resin sleeve having an axially extending slit and a tapered portion are attached to the valve body, The main body is formed with a tapered surface that contacts the tapered portion of the sleeve, and when the valve body moves toward the tapered surface, the sleeve presses the valve body due to the action of the tapered portion and the tapered surface. A pressure reducing valve with a pulsation prevention mechanism, characterized in that it is configured as follows.