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:
Feb. 02, 1982
Filed:
Oct. 04, 1979
Dwight N Johnson, El Toro, CA (US);
JH Industries, Inc., San Marcos, CA (US);
Abstract
A pilot valve designed to regulate a main liquid flow valve disposed in a fluid system is disclosed having a diaphragm and sliding poppet assembly which is biased in one direction by a reference force and movable in the opposite direction in response to variances in regulated pressure sensed upon the diaphragm. The pilot valve includes integrally formed self-cleaning restrictors which dampen the operation of the valve to eliminate chatter as the pilot valve throttles to maintain the desired liquid flow level in the fluid system. Stability during operation is provided by a positive feedback force being applied to the pilot poppet which is of the same magnitude as the pressure which positions the valve member of the main flow valve. This positive feedback force significantly reduces phase lag between the pilot and the main flow valve, thereby increasing valve response to load changes. The pilot valve may also be utilized in both pressure reducing and back pressure monitoring applications by the mere substitution of three internal parts, namely the valve seat insert, guide and a plunger or poppet.