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:
May. 25, 1982
Filed:
Nov. 05, 1980
Tommy L Gray, Dallas, TX (US);
Span Instruments, Inc., Plano, TX (US);
Abstract
A valve (10) is interconnected in a flow line to control the downstream pressure by means of a relatively low pressure control device such as a block and bleed valve coupled to a control port (28). An activating piston (54) is moveable within a piston chamber (32) for activating a ball valve (44) to interconnect an outlet port (22) with an inlet port (20). In a manual reset mode, a pressurized fluid at a reset port (26) enters a regulator chamber (38). From the regulator chamber (38), the fluid flows through a passage between an annulus (42) and an extension tube (62) into the piston chamber (32) and acts against the activating piston (54). As fluid enters the piston chamber (32), the pressure acting against the activating piston (54) increases and moves the piston upward to activate the ball valve (44). A sealing surface (90) on a regulator piston (86) in the regulator chamber (38) prevents flow between the regulator chamber and the piston chamber (32) if the activating piston (54) moves upward to a position activating the ball valve (44), thereby limiting the pressure acting on the activating piston. A spring (64) urges the activating piston downward, deactivating ball valve (44) when the control port (28) is open for fluid flow. In the automatic mode, the inlet port (20) and the reset port (26) are interconnected so that a continuous predetermined pressure will exist in the regulator chamber (38) and the valve (10) will be automatically reset.