| 摘要 |
PURPOSE:To eliminate the influence applied to a pressure reducing valve by securing such a mechanism where a valve body having an orifice at its center has displacement against the energizing force of a spring set in a casing when the secondary side pressure has a sudden change and the increase value of the secondary side pressure is ejected to outside through a hole drilled through the casing to outside. CONSTITUTION:When the primary side pressure has a normal slow change, a fluid can pass freely through an orifice 88 having a diameter smaller than those of pipes set before and after the orifice 88. However, the fluid cannot pass completely through the orifice 88 in case the pressure rises up due to a sudden change of pressure caused by the water hammer of a pipe set at the secondary side. Thus, the fluid displaces a valve body 90 toward the exit side against the force of a spring 92. Then, the side face of the body 90 opens an injecting port 94 and the fluid of the high pressure is ejected into the air. As a result, an instantaneous high-pressure fluid does not flow to a lower chamber of a diaphragm 28 and therefore both the diaphragm 28 and a pilot valve can have the normal stable actions. Thus, a pressure reducing valve is not affected even though the water hammer is produced.
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