Piston structure for pressure reducing valve
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United States of America Patent
Stats
-
Mar 7, 1989
Grant Date -
N/A
app pub date -
Aug 11, 1987
filing date -
Aug 12, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A piston structure of a pressure reducing valve in which a piston is formed on its side surface with an annular groove for receiving a piston ring therein and is slidably inserted into a cylinder together with the piston ring, and a main valve is operatively opened and closed by regulating the operating pressure of the piston through a pilot valve for operatively detecting a secondary pressure, the outer peripheral edge of an upper surface of the piston is formed in outer peripheral direction, to be lower than a circle on the upper surface that is axially aligned with the bottom surface of the annular groove or a circle located more inwardly thereof, to prevent the upper corner of the piston from collision with an inner wall of the cylinder, when the piston is inclined by fluid jetted from the main valve.
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