The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 1988
Filed:
Oct. 14, 1986
Francis V Marchal, Erie, PA (US);
Other;
Abstract
A high pressure relief valve for use in fluid systems, gas or liquid with zero leakage at pressures of 25,000 psi and above. The relief valve includes a valve body having an axial bore communicating with the high pressure fluid system with at least one, and preferably four, outlet orifices formed therethrough. A small diameter pilot hole is formed in the valve body communicating with the axial bore thereof and with a pilot seating area on an exterior surface thereof. A poppet member having an internal bore is slidably fitted over the valve body to seal off the outlet orifices when in a closed position and for uncovering the orifices when in an open position. A spring biases the poppet in the closed position. A pilot plunger is slidable mounted within the internal bore of the poppet to seal-off the pilot hole of the valve body when in a closed position. A spring biases the pilot plunger in the closed position. At a predetermined fluid pressure, the pilot plunger is adapted to unseat from the pilot hole which allows the high pressure fluid to flow therethrough and to cause the plunger to move the poppet to the open position to permit the venting of the system.