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. 27, 2001
Filed:
Jan. 19, 2000
Michael D. McNeely, Katy, TX (US);
Thomas F. Higgins, Houston, TX (US);
Tyco Flow Control, Inc., Houston, TX (US);
Abstract
A pilot operated safety relief valve (,) in which a pilot valve (,) controls the opening and closing of the main valve member (,). The pilot valve (,) has a spindle valve member (,) between an intermediate dome fluid chamber (,) and an exhaust chamber (,) communicating with exhaust port (,) and exhaust line (,). Spindle valve member (,) has an annular sealing member or membrane (,) having a relatively thin body (,) with opposed beads (,) along inner and outer peripheries of body (,) for sealing between spindle valve member (,) and the adjacent retainer sleeve (,). Any positive backpressure forces from exhaust line (,) are balanced against spindle valve member (,) by annular seal (,) and membrane (,). Membrane (,) is effective for sealing between spindle valve member (,) and retainer sleeve (,) without generation of frictional forces therebetween thereby to permit precise actuation of main valve member (,) within the tolerance of the relieving pressure specified for pilot valve (,).