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. 24, 1981
Filed:
Mar. 15, 1979
Clifford M Peters, Longview, TX (US);
W-K-M Wellhead Systems, Inc., Shreveport, LA (US);
Abstract
A manually reset control valve (28) to control the flow of fluid to a fluid actuator (22) in a safety system for closing a valve in a main flowline (10) upon the reaching of predetermined high and low pressures in the main flowline. The control valve includes an elongate housing having a supply port (26) and a bleed port (124) for the actuator, and a sensing port (34) for monitoring the fluid pressure in the main flowline. The valving in the bore of the housing includes a pressure sensing valve mechanism (42) and a control fluid valve mechanism (44). Pressure sensing valve mechanism (42) includes a high pressure spring (94) responsive to a predetermined high pressure in the flowline to actuate the valving and a low pressure spring (58) responsive to a predetermined low fluid pressure in the flowline to actuate the valving for bleeding the actuator. The control fluid valve mechanism (44) includes a piston (110) movable between supply and vent positions in response to the actuation of the sensing valve mechanism (42). A manual gripping knob (108) on an outer end of the control fluid valve mechanism (44) is pushed for resetting the valving after actuation and a lost motion connection between the pressure sensing valve mechanism (42) and the control fluid valve mechanism (44) permits valve mechanism (44) to be pushed in and reset with a minimum of force.