Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1981-04-06
1983-09-06
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137492, 251282, F16K 31122
Patent
active
044023413
ABSTRACT:
A pilot operated relief valve for use on medium and high pressure vessels, conduits and the like.
A two-stage, non-flowing valve (5) operates a main relief valve (7) of substantially greater capacity. Flow control elements provided by (35), (36), (38), and (39) associated with the first stage poppet are utilized to provide positive valve operation. In a preferred embodiment the main valve is mounted directly onto the pressure vessel which is to be vented at a predetermined pressure. The pilot is preferably mounted closely adjacent to and in fluid communication with the main valve. A flow adapter (100) having a self-cleaning orifice is disposed intermediate said main valve head volume (68) and pilot vent port (1) to provide improved operation of the combination. A ball (16) selector, (24, 15, 76) provides means for conveniently connecting to a field testing either the pilot or the entire valve, providing improved setpoint and reset or blowdown adjustments for the overall combination.
A single stage proportional pilot valve (131) operates main valve (7) to provide pressure relief flow corresponding to the degree of over pressure (Ref. FIG. 16). A partially pressure balanced large diameter poppet (142), and reduced diameter seals 145b provide increased sensitivity to over pressure, improved setting accuracy, and poppet stability. A ball closure arrangement, (154) (158) acts to conserve test gas.
REFERENCES:
patent: 2350202 (1944-05-01), Thomas
patent: 2627388 (1953-02-01), Johnson
patent: 3298390 (1967-01-01), De Graaf
patent: 3664362 (1972-05-01), Weise
patent: 3722860 (1973-03-01), Curran
Cohan Alan
Lidd Francis J.
Vapor Corporation
LandOfFree
Pilot operated relief valve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pilot operated relief valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pilot operated relief valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1587360