JP5758210B2 - 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 in particular, the valve body and the valve stem. It is related with what can measure the weight of.

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 valve body that opens and closes and opens and closes the valve port is placed in the valve chamber. A valve stem is formed integrally with the valve body. The outer periphery of the valve stem is slidably guided by a guide hole formed in the valve casing. When the valve body is seated on the annular valve seat and the valve port is closed, 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 port is opened. The valve opens.

JP 2009-121611 A

In the above conventional relief valve, if foreign matter such as dust or scale in the fluid is caught between the valve body and the annular valve seat or between the valve stem and the guide hole, the displacement resistance of the valve body and the valve stem increases. There is a problem that the on-off valve operation cannot be performed at a predetermined set pressure value.

Therefore, the problem to be solved by the present invention is to provide a relief valve that can confirm whether or not the displacement resistance of the valve body and the valve stem is increased with a simple structure.

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 an opening is provided, a valve body that opens and closes the annular valve seat and opens and closes the valve opening is disposed in the valve chamber, a valve stem is formed integrally with the valve body, and a guide hole formed in the valve casing The outer periphery of the valve stem is slidably guided, and the valve body is normally seated on the annular valve seat and the valve port is closed, so that the valve pressure is higher than the set pressure value compared to the outlet pressure. When the body is separated from the annular valve seat to open the valve port, an opening is provided on the outside of the guide hole into which the measuring part of the weight measuring means for measuring the weight of the valve body and the valve stem is inserted, and the relief is provided. during operation of the valve opening closing member is removed when the weight measurement of the occluded valve body and valve stem in the closing member heavy from the opening It is characterized in that the measuring unit of the measuring device is inserted.

The present invention provides an opening into which a measuring part of a weight measuring means for measuring the weight of the valve body and the valve stem is inserted on the outside of the guide hole, and the opening is closed by a closing member when the relief valve is operated. When the weight of the valve stem is measured, the closing member is removed, and the measuring unit of the weight measuring means is inserted from the opening. Therefore, by removing the closing member , inserting the weight measuring means from the opening, and measuring the weight of the valve body and the valve stem by the weight measuring means, the measured weight of the valve body and the valve stem is the initial valve body and valve. If the weight is greater than the weight of the rod, it can be confirmed that the displacement resistance of the valve body and the valve rod is increased.

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 disc-shaped valve body 9 that opens and closes the valve seat 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 a lower valve rod 10 provided so as to protrude from the lower surface and an upper valve rod 11 provided so as to protrude from the upper surface. The outer periphery of the lower valve stem 10 is slidably guided by a lower guide hole 12 formed integrally with the main body 1, and the outer periphery of the upper valve stem 11 is slidable by an upper guide hole 13 formed integrally with the lid member 2. invite. A lower opening 16 into which a measuring unit of a weight measuring means (not shown) for measuring the weight of the valve body 9, the lower valve stem 10, and the upper valve stem 11 is provided outside the lower guide hole 12. The lower opening 16 is closed by a lower plug 17 as a closing member during operation of the relief valve, and the lower plug 17 is removed when the weight of the valve body 9, the lower valve stem 10, and the upper valve stem 11 is measured, and the weight measuring means measures. Part is inserted. The weight of the valve body 9, the lower valve stem 10, and the upper valve stem 11 is measured by pushing up the lower valve stem 10 by the weight measuring means. An upper opening 18 into which a measuring unit of a weight measuring means (not shown) for measuring the weight of the valve body 9, the lower valve stem 10, and the upper valve stem 11 is inserted outside the upper guide hole 13. The upper opening 18 is closed by an upper plug 19 as a closing member when the relief valve is operated, and the upper plug 19 is removed when the weights of the valve body 9, the lower valve stem 10, and the upper valve stem 11 are measured, and the weight measuring means measures. Part is inserted. The weight of the valve body 9, the lower valve stem 10, and the upper valve stem 11 is measured by connecting the measuring section of the weight measuring means to the upper valve stem 11 with a screw or hook and lifting the upper valve stem 11 with the weight measuring means. In the present embodiment, an example in which both the lower opening 16, the lower plug 17 and the upper opening 18, and the upper plug 19 are provided is illustrated, but any one of the lower opening 16 and the lower plug 17 or the upper opening 18 and the upper plug 19 is provided. It is also possible to provide only one of them.

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.

When confirming whether or not the displacement resistance of the valve body 9, the lower valve stem 10, and the upper valve stem 11 is large, the lower plug 17 or the upper plug 19 is removed, and the weight measuring means is removed from the lower opening 16 or the upper opening 18. Is inserted, and the weight of the valve body 9, the lower valve stem 10, and the upper valve stem 11 is measured by pushing up the lower valve stem 10 by the weight measuring means or lifting the upper valve stem 11.

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 Inflow port 5 Outlet port 6 Valve port 7 Annular valve seat 8 Cylinder 9 Valve body 10 Lower valve rod 11 Upper valve rod 12 Lower guide hole 13 Upper guide hole 14 Outflow window 15 Normally open window 16 Lower opening 17 Lower plug 18 Upper opening 19 Upper plug

Claims (1)

A valve chamber in which the inlet and outlet communicate with each other is formed in a valve casing having an inlet and an outlet, an annular valve seat having a valve port is provided between the inlet and the valve chamber, and the valve seat is attached to and detached from the annular valve seat. The valve body that opens and closes the valve port is arranged in the valve chamber, the valve body is formed integrally with the valve body, and the outer periphery of the valve body is slidably guided by the guide hole formed in the valve casing. Sits on the annular valve seat, closes the valve port, and when the pressure at the inlet becomes higher than the set pressure value compared to the pressure at the outlet, the valve body separates from the annular valve seat and opens the valve port In the device, an opening into which the measuring unit of the weight measuring means for measuring the weight of the valve body and the valve stem is inserted is provided on the outer side of the guide hole, and the opening is closed by the closing member when the relief valve is operated. Lili the closure member is removed when the weight measurement of the rod, characterized in that the measurement of the weight measuring means from the opening is inserted Off valve.

Images