Title:
PILOT OPERATED RELIEF VALVE
Document Type and Number:
WIPO Patent Application WO2001069109
Kind Code:
A3
Abstract:
A pilot operated safety relief valve (14) having a main piston valve member (26). A dome chamber (42) is provided in the valve body (18) over piston valve member (26) and a cap (44) forms a closure for dome chamber (42). A pilot valve (46) is mounted on the cap (44) and has a diaphragm actuated fluid inlet sensing tube (60) received within a bore (30) of the piston valve member (26). Inlet fluid pressure is communicated through bore (61) of sensing tube (60) to the inlet fluid sensing chamber (84) on the outer side of diaphragm (65). Exhaust chamber (56) is positioned between dome chamber (42) and inlet sensing chamber (84). Adjustment spring (67) continuously urges O-ring (72) in dome chamber (42) to a seated position on seat (70). An annular clearance (78) is provided between sensing tube (60) and piston (26) for providing a restricted fluid flow between dome chamber (42) and the inlet (20).
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Inventors:
CONLEY JEFF A
Application Number:
PCT/US2001/007956
Publication Date:
March 07, 2002
Filing Date:
March 13, 2001
Export Citation:
Assignee:
TYCO FLOW CONTROL INC (US)
International Classes:
F16K31/385; A61M39/00; F16K17/10; (IPC1-7): F16K31/12
Foreign References:
| US6161570A | 2000-12-19 | |||
| US6119722A | 2000-09-19 | |||
| US6039070A | 2000-03-21 | |||
| US4722361A | 1988-02-02 |
Other References:
See also references of EP 1269052A4
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