JP5588234B2 - 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. There is a problem that a hunting phenomenon occurs in which the valve port is opened by opening the valve port from the seat and the valve element is repeatedly seated on the annular valve seat.

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 a valve body on an annular valve seat.

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 to guide 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 width of the outflow window is displaced in the valve opening direction. It is formed so that it becomes wider as the pressure increases, and a normally open window is formed in the upper part of the cylinder to communicate the inside and outside. Normally, the valve body is seated on the annular valve seat, the valve port is closed, and the inlet pressure is reduced. When the pressure becomes higher than the set pressure value compared to the outlet pressure, the valve body is separated from the annular valve seat and the valve opening is opened. Body is characterized in that opening the outflow window is displaced by a predetermined amount the valve opening direction.

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. Is formed so that the width of the outflow window becomes wider as the displacement of the valve body in the valve opening direction increases, and a normally open window that communicates the inside and outside is formed at the upper part of the cylinder. When the valve seat is closed by closing the valve seat and the pressure at the 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 and the valve mouth is opened. The body is displaced by a predetermined amount in the valve opening direction to open the outflow window. 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, the fluid flows from the inlet to the outlet by opening the outlet window. 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. The outlet pressure decreases, 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, opens the outlet window, and the outlet window is repeatedly opened and closed. . Therefore, since the valve body does not repeat sitting on the annular valve seat, an excellent effect that noise can be reduced is achieved. In addition, the width of the outflow window is formed so as to increase as the displacement of the valve body in the valve opening direction increases, so when the displacement of the valve body in the valve opening direction is small, from the inlet to the outlet. The flowing fluid can be further reduced, and an excellent effect is obtained that the valve body can be surely prevented from being repeatedly seated on the annular valve seat. In addition, a normally open window that communicates the inside and outside of the cylinder is formed at the top of the cylinder, so that the pressure inside the cylinder above the valve body can be released to the outside of the cylinder, and the inside of the cylinder above the valve body becomes a pressure pool. There is an excellent effect that this can be prevented.

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, and a flow having a guide hole for slidingly guiding the outer periphery of the outlet-side valve stem 11. The outlet side guide member 13 is formed integrally with 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 width of the outflow window 14 is narrower in the lower part and wider in the upper part so as to increase as the displacement of the valve element in the valve opening direction increases. A plurality of, for example, four normally open windows 15 communicating inside and outside are formed at the upper end of the cylinder. The normally open window 15 allows the pressure inside the cylinder 8 above the valve body 9 to escape to the outside of the cylinder 8 and prevents the inside of the cylinder 8 above the valve body 9 from accumulating pressure. 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. Then, the valve port 6 is opened and the valve element 9 is displaced in the valve opening direction by a predetermined amount to open the outflow window 14.

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. Displacement in the direction opens 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 the valve element 9 is not repeatedly seated on the annular valve seat 7, noise can be reduced. Further, since the width of the outflow window 14 is formed so as to increase as the displacement of the valve body 9 in the valve opening direction increases, the inflow port 4 when the displacement of the valve body 9 in the valve opening direction is small. Thus, the fluid flowing from the outlet 5 to the outlet 5 can be reduced, and the valve body 9 can be reliably prevented from repeatedly seating on the annular valve seat 7. Further, since the normally open window 15 that communicates the inside and the outside is formed in the upper part of the cylinder 8, the pressure in the cylinder 8 above the valve body 9 can be released to the outside of the cylinder 8, and the cylinder above the valve body 9 can be relieved. It can prevent that the inside of 8 becomes a pressure accumulation.

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 Outlet side guide member 14 Outflow window 15 Normally open window

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 an opening flow out window is when the body is displaced in a predetermined amount the valve opening direction by unseated from the annular valve seat in the cylinder, the displacement becomes large width of the outlet windows in the valve opening direction of the valve body wide so as to be formed according to, communicating the inside and outside of the cylinder to the top of the cylinder That the normally fenestration formed, normally when the pressure of the inlet is closed the valve opening by the valve body is seated on the annular valve seat is higher than the set pressure value than the pressure of the outlet relief valve, wherein the valve body is opened the displacement and the outflow windows the valve body is in a predetermined amount the valve opening direction as well as open the valve port and unseated from the annular valve seat.

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