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:
Jun. 17, 1980
Filed:
Nov. 13, 1978
Clifford M Peters, Longview, TX (US);
W-K-M Wellhead Systems, Inc., Shreveport, LA (US);
Abstract
A control valve for a fluid actuator has a slide valve member mounted within a housing or body with an external knob on one end and a piston on the other end. The body has a central bore with an enlarged bore portion forming a valve chamber in which the piston is mounted for reciprocation. The chamber adjacent one piston face forms a fluid storage chamber and the chamber adjacent the other piston face forms a fluid pressure chamber to receive pressurized fluid. A one-way check valve is positioned between the two chambers and permits fluid pressure in the fluid storage chamber to be equalized with the fluid pressure in the pressure chamber. Upon a subsequent exhaust of fluid from the fluid pressure chamber, the piston will move quickly to a seated position under the fluid pressure in the storage chamber without any separate urging means, such as a spring, being necessary.