JP5552342B2 - Relief valve - Google Patents

Description

The present invention relates to a relief valve that is connected to a fluid piping system such as a fluid piping or a fluid device and opens when the pressure at the inlet becomes higher than a set pressure value compared with the pressure at the outlet, and particularly prevents noise caused by hunting. It relates to what can be done.

A conventional relief valve is disclosed in Patent Document 1, for example. This is because a valve chamber in which an inlet and an outlet communicate with each other is formed in a valve casing having an inlet and an outlet, and an annular valve seat having a valve port is provided between the inlet and the valve chamber. A disc-shaped valve element that opens and closes and opens and closes the valve port is placed in the valve chamber. Normally, the valve element is seated on the annular valve seat, the valve port is closed, and the inlet pressure becomes the outlet pressure. When the pressure is higher than the set pressure value, the valve body is separated from the annular valve seat and the valve port is opened.

JP 2006-170321 A

In the conventional relief valve described above, when the pressure at the inlet becomes higher than the set pressure value compared with the pressure at the outlet, the valve body separates from the annular valve seat and opens the valve port, so that fluid flows from the inlet. When the fluid flows from the inlet to the outlet, the pressure difference between the inlet and the outlet becomes lower than the set pressure value, and the valve element sits on the annular valve seat and closes the valve opening. When the valve body is seated on the annular valve seat and the valve port is closed, the pressure at the outflow port decreases and the pressure at the inflow port becomes higher than the set pressure value compared to the pressure at the outflow port. A hunting phenomenon occurs in which the valve port is opened by opening the valve port from the seat and the valve valve is repeatedly opened, and the noise caused by repeated seating of the valve body on the annular valve seat and contact of the valve body with the valve casing when fully opened There was a problem that it was remarkable.

Therefore, the problem to be solved by the present invention is to provide a relief valve that can reduce noise caused by repeated seating of the valve body on the annular valve seat and contact of the valve body with the valve casing when fully opened.

In order to solve the above problems, a relief valve of the present invention forms a valve chamber in which a flow inlet and a flow outlet communicate with each other in a valve casing having a flow inlet and a flow outlet, and the valve is provided between the flow inlet and the valve chamber. An annular valve seat having a port is provided, and a disc-shaped valve body that opens and closes the valve valve seat and opens and closes the valve port is disposed in the valve chamber. The outer periphery of the valve body slides in the axial direction of the valve port. A cylinder for guiding is provided, and an outflow window that opens when the valve body is separated from the annular valve seat and displaced in the valve opening direction by a predetermined amount is provided in the cylinder, and the outflow window is urged in the valve body direction by an elastic member After that, a movable member that contacts the valve body that is displaced in the fully open direction is provided, and the valve body is normally seated on the annular valve seat and the valve port is closed so that the pressure at the inlet is a set pressure value compared to the pressure at the outlet. The valve body is separated from the annular valve seat to open the valve port, and the valve body is displaced by a predetermined amount in the valve opening direction. Valve outflow window after opening the open outlet window Te is characterized in that the displacement in the fully open direction while allowed displace the movable member against the elastic member.

The present invention provides a cylinder that slides and guides the outer periphery of the valve body in the axial direction of the valve port, and sets the outflow window that opens when the valve body is separated from the annular valve seat and displaced in the valve opening direction by a predetermined amount. Provided with a movable member that contacts the valve body that is urged in the valve body direction by an elastic member and opens in the outflow window and then displaces in the fully open direction. Normally, the valve body is seated on the annular valve seat and the valve port is closed. When the pressure at the valve inlet becomes higher than the set pressure value compared to the pressure at the outlet, the valve body is separated from the annular valve seat to open the valve port and the valve body is displaced in the valve opening direction by a predetermined amount. After opening the outflow window and opening the outflow window, the valve body is displaced in the fully open direction while displacing the movable member against the elastic member. Therefore, when the pressure at the inlet becomes higher than the set pressure value compared with the pressure at the outlet, the valve body is separated from the annular valve seat to open the valve port, and the valve body is displaced in the valve opening direction by a predetermined amount. Then, after opening the outflow window and opening the outflow window, the valve body is displaced in the fully open direction while displacing the movable member against the elastic member, so that the fluid flows from the inflow port to the outflow port. When the fluid flows from the inlet to the outlet, the pressure difference between the inlet and outlet becomes lower than the set pressure value, and the valve body is displaced in the valve closing direction to close the outflow window, and the valve body closes the outflow window. After the outlet pressure decreases and the inlet pressure becomes higher than the set pressure value compared to the outlet pressure, the valve body is displaced again in the valve opening direction to open the outflow window and open the outflow window. The body is displaced in the full opening direction while displacing the movable member against the elastic member, and repeatedly opens and closes the outflow window. Therefore, since the valve body does not repeatedly sit on the annular valve seat, noise due to repeated seating of the valve body on the annular valve seat can be reduced, and the impact when the valve body comes into contact with the valve casing when fully opened is reduced. Since it can be buffered by the elastic member, there is an excellent effect that noise due to repeated contact of the valve body with the valve casing when fully opened can be reduced.

It is sectional drawing of the relief valve concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. A valve casing is constituted by the main body 1 and the lid member 2, and a valve chamber 3 is formed in the valve casing. An inlet 4 and an outlet 5 communicating with the valve chamber 3 are formed in the main body 1, and an annular valve seat 7 having a valve port 6 is provided at the valve chamber 3 side opening end of the inlet 4. A cylinder 8 is formed integrally with the annular valve seat 7. The annular valve seat 7 and the cylinder 8 are sandwiched and fixed between the main body 1 and the lid member 2. A valve body 9 on a disk that opens and closes the valve port 6 by being seated on and off the annular valve seat 7 is disposed in the valve chamber 3 so as to face the annular valve seat 5. The valve body 9 integrally includes an inlet-side valve rod 10 provided so as to protrude from the lower surface thereof and an outlet-side valve rod 11 provided so as to protrude from the upper surface thereof. An inlet-side guide member 12 having a guide hole for slidingly guiding the outer periphery of the inlet-side valve stem 10 is formed integrally with the main body 1. A movable member 13 having a function as an outlet side guide member having a guide hole for slidingly guiding the outer periphery of the outlet side valve stem 11 is held by a cap nut 15 that is screwed to the lid member 2. The movable member 13 is urged toward the valve body 9 by a coil spring 16 as an elastic member disposed between the movable member 13 and the lid member 2.

The cylinder 8 slides and guides the outer periphery of the valve body 9 in the axial direction of the valve port 6, and a plurality of openings are opened when the valve body 9 is moved away from the annular valve seat 7 and displaced in the valve opening direction by a predetermined amount. For example, it has four outflow windows 14. The movable member 13 is in contact with the valve body 9 that is displaced in the full opening direction after the outflow window 14 is opened. Normally, when the valve body 9 is seated on the annular valve seat 7 and the valve port 6 is closed and the pressure at the inlet 4 becomes higher than the set pressure value compared with the pressure at the outlet 5, the valve body 9 is moved to the annular valve seat 7. The valve body 9 is moved against the coil spring 16 after the valve body 9 is opened and the valve body 6 is opened and the valve body 9 is displaced by a predetermined amount in the valve opening direction to open the outflow window 14 and open the outflow window 14. The member 13 is displaced in the fully open direction while being displaced.

In the state shown in the drawing, the pressure at the inlet 4 is always lower than the set pressure value compared with the pressure at the outlet 5, and the valve body 9 is seated on the annular valve seat 7 and the valve port 6 is closed.

When the pressure at the inlet 4 becomes higher than the set pressure value compared to the pressure at the outlet 5, the valve body 9 is separated from the annular valve seat 7 to open the valve port 6 and the valve body 9 is opened by a predetermined amount. The valve body 9 is displaced in the fully open direction while displacing the movable member 13 against the coil spring 16 after opening the outflow window 14 by opening the outflow window 14. As a result, the fluid flows from the inlet 4 to the outlet 5 through the valve port 6 and the outlet window 14. When the fluid flows from the inlet 4 to the outlet 5, the pressure difference between the inlet 4 and the outlet 5 becomes lower than the set pressure value, the valve body 9 is displaced in the valve closing direction, the outlet window 14 is closed, and the valve body is closed. When 9 closes the outflow window 14, the pressure at the outlet 5 decreases, the pressure at the inlet 4 becomes higher than the set pressure value compared to the pressure at the outlet 5, and the valve element 9 is displaced again in the valve opening direction. The outflow window 14 is opened and the outflow window 14 is repeatedly opened and closed. Therefore, since it does not repeat that the valve body 9 seats on the annular valve seat 7, the noise by repeating that the valve body 9 seats on the annular valve seat 7 can be reduced. Further, since the impact when the valve body 9 comes into contact with the lid member 2 when fully opened can be buffered by the coil spring 16, noise due to repeated contact of the valve body 9 with the lid member 2 when fully opened can be reduced.

The present invention can be used for a relief valve that is connected to a fluid piping system such as a fluid piping or a fluid device and opens when the pressure at the inlet becomes higher than a set pressure value compared to the pressure at the outlet.

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid member 3 Valve chamber 4 Inlet 5 Outlet 6 Valve port 7 Annular valve seat 8 Cylinder 9 Valve body 10 Inlet side valve rod 11 Outlet side valve rod 12 Inlet side guide member 13 Movable member 14 Outlet window 15 Cap nut 16 Coil spring

Claims (1)

It said inlet and said outlet to form a valve chamber communicating with a valve casing having an inlet and an outlet, an annular valve seat having a valve port between said valve chamber and said inlet port, said annular valve in the disc-shaped valve element for opening and closing the valve port and away sitting on the seat which is arranged in the valve chamber, to project an inlet side valve rod periphery is slidably guided from one side of the valve body together with an outlet-side valve rod periphery is slidably guided to protrude from the other surface of the valve body is provided, a cylinder for sliding guide an outer periphery of the valve body in the axial direction of the valve port is provided, said valve is provided fully opened from the body said annular valve seat and unseated provided an outlet window which is opened when the displacement in a predetermined amount the valve opening direction to the cylinder, after opening the biased the outlet window into the valve body direction by the elastic member the valve body is displaced in the direction provided movable member abuts, normally the valve body is the Seated on Jo valve seat closes the valve port said inlet pressure is the higher than the set pressure value in comparison with the pressure outlet and the valve body is unseated to said valve from said annular valve seat said valve body while allowed to displace the movable member against the valve body is the elastic member after opening and opening said outlet window is displaced by a predetermined amount the valve opening direction the outflow window with opening the mouth A relief valve that is displaced in the fully open direction.

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