Pressure reducing valve

摘要

In a pressure reducing valve, a linking mechanism for linking a valve shaft of a pressure reducing valve body and a diaphragm rod is formed from a bottomed linking hole provided in the diaphragm rod, a decreased diameter shaft portion provided on the valve shaft, first and second increased diameter shaft portions disposed on the decreased diameter shaft portion, a retaining plate fitted into the linking hole and has a latching recess portion, and a latching ring that engages with a first latching groove provided on the retaining plate and a second latching groove provided on the linking hole, the latching ring being capable of increasing in diameter along a radial direction of the valve shaft, and a set spring is provided in a compressed state in the linking hole, the set spring urging the retaining plate toward the side on which the pressure reducing valve body is opened.

主权项

1. A pressure reducing valve comprising a valve seat member that has a valve hole providing communication between a high pressure chamber and a pressure reducing chamber, a pressure reducing valve body that opens and closes the valve hole in cooperation with the valve seat member, a diaphragm rod that is linked via a linking mechanism to a valve shaft connectedly provided at one end of the pressure reducing valve body, and a diaphragm that is joined to the diaphragm rod and disposed so as to provide a partition between a control pressure chamber and a pressure action chamber, the pressure action chamber being made to communicate with the pressure reducing chamber, the diaphragm pulling the valve shaft so as to seat the pressure reducing valve body on the valve seat member when shifting to the control pressure chamber side, the diaphragm pushing the valve shaft so as to separate the pressure reducing valve body from the valve seat member when shifting to the pressure action chamber side,
the linking mechanism being formed from a bottomed linking hole that is provided in the diaphragm rod and opens on the valve seat member side, a decreased diameter shaft portion provided on the valve shaft and first and second increased diameter shaft portions disposed on opposite sides in the axial direction of the decreased diameter shaft portion and having a larger diameter than that of the decreased diameter shaft portion, a retaining plate that is fitted into the linking hole and has a latching recess portion opening on one side and having a width that is larger than an external diameter of the decreased diameter shaft portion and smaller than an external diameter of the two increased diameter shaft portions, the decreased diameter shaft portion being loosely inserted into the latching recess portion, and a latching ring that engages with an arc-shaped first latching groove provided on an outer peripheral face of the retaining plate and an annular second latching groove provided on an inner periphery of the linking hole so as to correspond to the first latching groove, the latching ring being capable of increasing in diameter along a radial direction of the valve shaft, wherein a set spring is provided in a compressed state in the linking hole, the set spring urging the retaining plate toward the side on which the pressure reducing valve body is opened.