Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1975-06-16
1978-02-28
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
1374895, 1374925, F16K 31126
Patent
active
040760413
ABSTRACT:
A scuba regulator second stage utilizes pneumatic amplification to achieve very low inhalation effort. The regulator includes (a) a main flow valve consisting of a poppet moveable within a valve housing inside the regulator body, (b) a pilot valve mounted within and carried by the main valve poppet, and (c) a pressure sensing diaphragm linked to the pilot valve.
During inhalation, the diaphragm and linkage open the pilot valve to admit gas at supply pressure into a space, between the poppet and a closed end of the housing. This gas displaces the poppet, thereby opening the main flow valve and supplying gas to the diver. Pneumatic amplification is achieved. The poppet displacement tends to close the pilot valve, so that the poppet-opening force is reduced. This feedback effect results in substantially linear relationship between inhalation demand and the amount of breathable gas supplied to the diver.
REFERENCES:
patent: 757590 (1904-04-01), Zindol
patent: 1184761 (1916-05-01), Lytton
patent: 1198595 (1916-09-01), Stolle
patent: 2817334 (1957-12-01), Sajeck
patent: 3047001 (1962-07-01), Hosford
patent: 3381707 (1968-05-01), Andersen
patent: 3495619 (1970-02-01), Iizumi
patent: 3783891 (1974-01-01), Christianson
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