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Pressure Relieved Hydraulic Piston

IP.com Disclosure Number: IPCOM000097065D
Original Publication Date: 1962-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Ma, JT: AUTHOR [+2]

Abstract

This device acts as a relief valve across the face of a piston in a pressurized hydraulic system. It also operates to relieve the pressure differential across the piston, reducing cavitation and the consequent erosion and turbulence in the whole system.

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Pressure Relieved Hydraulic Piston

This device acts as a relief valve across the face of a piston in a pressurized hydraulic system. It also operates to relieve the pressure differential across the piston, reducing cavitation and the consequent erosion and turbulence in the whole system.

Piston F, mounted upon actuating shaft H, has a relief valve consisting of stud S, spring SP and steel ball B on opposite sides. These valves are oppositely facing to be actuated by differential pressures of opposite magnitude. The port P1 on the high-pressure side of a given valve is bored through the face of the piston, being enlarged in its after-portion so as to accommodate stud S1. The latter is perforated throughout by hole O1, is in substantial registry with port P1 and communicates with P1 by way of the intervening steel ball B1, biased on spring SP1. Spring SP1 is preset with such a stiffness constant so that a given over-pressure overcomes its closing force on the ball B1. This moves in the opening direction, relieving the over pressure by sending the fluid through port P1 and out port O1 on the opposite side of piston F. The pass-through fluid thus relieves the over pressure at port P1 and, at the same time, relieves the under pressure or vacuum at port O1, minimizing cavitation in the vacuum region.

On the opposite side of piston F there is a duplicate but oppositely directed valve system for relieving oppositely-directed over pressures and vacuums in this same manner...