JP5982256B2 - Relief valve - Google Patents

Description

  The present invention relates to a relief valve that opens a valve when the fluid pressure reaches a certain value or higher.

  A conventional relief valve is known that can maintain the primary pressure below a certain value by the operation of a diaphragm and an on-off valve provided at the center of the diaphragm (for example, Patent Document 1).

  In such a relief valve, the diaphragm has a circular shape, and has a structure in which the diaphragm is sandwiched between the boundary portions of the cases constituting the primary side chamber and the secondary side chamber. Specifically, the relief valve includes a diaphragm at a boundary between the case constituting the primary side chamber and the secondary side chamber, and is a water stop that opens and closes a flow path at the boundary between the primary side chamber and the secondary side chamber. A relief valve having a valve body having a function, wherein when the primary pressure rises when the valve body closes the boundary between the primary side chamber and the secondary side chamber, the primary side chamber and the secondary side chamber A relief valve mechanism that communicates with the relief valve mechanism, the relief valve mechanism having a relief valve seat, a relief spring, and a relief valve body so that fluid can easily flow into the primary side chamber in the primary side chamber case. A water flow groove is provided, and the relief valve seat is provided with a protrusion that fits into the water flow groove. And the two water flow grooves are provided at positions that extend toward the movement axis on which the relief valve body moves and are opposed to each other across the movement axis, and the projections are arranged to face the two movement axes. Two are provided so as to fit in the water flow groove.

JP 2008-138784 A

  However, in the conventional configuration, only two protrusions are provided so as to fit into two water passage grooves facing each other across the movement shaft, and therefore the diaphragm moves along the facing direction of the two protrusions. There was no means to regulate. Therefore, when the diaphragm is housed in the case and assembled, the diaphragm may be displaced from the center of the case. For this reason, there was a problem that the diaphragm did not move originally and the reliability of the relief valve was lowered.

  Therefore, the present invention provides a relief valve that can be securely attached to the center of the case when the diaphragm is assembled to the case.

The present invention is a valve having a water stop function for opening and closing a flow path of a boundary portion between the primary chamber and provided with a diaphragm in the boundary portion between the case of each constituting a secondary chamber, said primary chamber and said secondary chamber A relief valve that allows the primary side chamber and the secondary side chamber to communicate with each other when the primary pressure rises when the valve element closes the boundary between the primary side chamber and the secondary side chamber The relief valve mechanism includes a relief valve seat provided on the diaphragm , a relief spring, and a relief valve element, and the primary side chamber case allows fluid to easily flow into the primary side chamber. A water flow groove is provided, the water flow groove is recessed in the axial direction of the moving shaft on which the relief valve body moves, extends from the inner wall side of the primary side chamber case toward the moving shaft, and sandwiches the moving shaft. In a position that does not face Provided two even without, wherein the relief valve seat, the projections get stuck on the water passage groove is provided, the projection is characterized in that it is provided in a position fitted into the at least two water passing grooves.

  In the present invention, when the diaphragm is assembled to the case of the diaphragm, the diaphragm can be securely attached to the center of the case.

1 is a schematic view of a relief valve according to an embodiment of the present invention. Sectional drawing of the relief valve which concerns on embodiment of this invention. The related figure of the primary side chamber case and relief valve seat protrusion of the relief valve which concerns on embodiment of this invention. The top view of the primary side chamber case of the relief valve which concerns on embodiment of this invention. The relief valve seat in which the protrusion was provided in the relief valve which concerns on embodiment of this invention. The related figure of the primary side chamber case and relief valve seat protrusion of the relief valve which concerns on the modification of embodiment of this invention.

  As shown in FIGS. 1 and 2, the relief valve 1 according to the present embodiment includes a primary side chamber case 2, a secondary side chamber case 3, a diaphragm 5, a relief valve seat 7, a water flow groove 10, and the like. .

  The relief valve 1 is provided with a relief valve seat 7 coaxially with the diaphragm 5, provided with a relief valve body that is movable in the axial direction with respect to the 5 diaphragm and biased against the valve seat by a spring. When the primary pressure of the passage 20 rises, the diaphragm 5 moves against the pressing spring force and moves to the secondary side. When the primary pressure exceeds a predetermined pressure, one end of the shaft provided with the valve element comes into contact with the piston. The valve body opens when it leaves the valve seat.

  The primary side chamber case 2 is provided with a plurality of water flow grooves 10 so that fluid can easily flow from the flow path 20 to the primary side chamber 18. The relief valve seat 7 is provided with a plurality of protrusions 11.

  Specifically, at least two water flow grooves 10 are provided at positions that extend toward the moving shaft on which the relief valve body moves and do not face each other with the moving shaft interposed therebetween. Further, the protrusion 11 is provided at a position where it fits into at least two water flow grooves 10.

  The width of the water flow groove 10 is configured to be slightly larger than the width of the protrusion 11. The protrusions 11 are configured to drop into the water passage grooves 10, and the number of the water passage grooves 10 is configured to be larger than that of the protrusions 11. Further, the depth of the water flow groove 10 is configured to be slightly deeper than the height of the protrusion 11.

  As shown in FIG. 4, six water passage grooves 10 are provided around the movement axis. As shown in FIG. 5, the protrusion 11 has three water passage grooves 10 out of the six water passage grooves 10. It is provided at a position where it fits in. In this example, the protrusions 11 are provided at positions that are not diagonal. FIG. 3 shows a state in which the three protrusions 11 are fitted into three of the six water passage grooves 10. Thus, when the diaphragm case is assembled, the diaphragm is arranged at the center of the case, and the diaphragm does not rotate or deviate from the center. Further, it is possible to prevent malfunction due to the displacement of the diaphragm 5 when the relief valve mechanism 6 is operated.

  FIG. 6 shows a relief valve according to a modification of the embodiment of the present invention. Four water grooves 10 are provided around the movement axis, and the protrusion 11 is formed by the four water grooves. Four are provided at the positions where they fit. In this modification, the valve seat protrusions 11 positioned diagonally face each other across the movement axis, but the movement of the diaphragm is restricted by the protrusions 11 provided at positions not facing each other.

DESCRIPTION OF SYMBOLS 1 Relief valve 2 Primary side chamber case 3 Secondary side chamber case 4 Handle 5 Diaphragm 6 Relief valve mechanism 7 Relief valve seat 10 Water flow groove 11 Protrusion

Claims (3)

Comprising a diaphragm in the boundary portion between the case of each constituting a primary chamber and a secondary chamber, relief valve comprises a valve body having a water stop function for opening and closing a flow path of a boundary portion between the secondary chamber and the primary chamber And, when the valve body closes the boundary between the primary side chamber and the secondary side chamber, a relief valve mechanism is provided that communicates the primary side chamber and the secondary side chamber when a primary pressure rises, The relief valve mechanism includes a relief valve seat provided on the diaphragm , a relief spring, and a relief valve body, and the primary side chamber case has a water flow groove so that fluid can easily flow into the primary side chamber. The water passage groove is recessed in the axial direction of the moving shaft on which the relief valve body moves , and extends from the inner wall side of the primary side chamber case toward the moving shaft and does not face the moving shaft. At least One is provided, wherein the relief valve seat, the projections get stuck on the water passage grooves are provided, said projection, relief valve, characterized in that provided at a position fitted into the at least two water passing grooves.   6. The water passage groove is provided around the movement axis, and the protrusion is provided at a position where the water groove fits into three of the six water passage grooves. The mentioned relief valve.   2. The relief valve according to claim 1, wherein four water passage grooves are provided around the movement axis, and four protrusions are provided at positions where the four water passage grooves fit into the water passage grooves.