Refrigeration – Automatic control
Patent
1975-05-08
1977-03-15
Weakley, Harold W.
Refrigeration
Automatic control
13750522, 13750547, 13763014, F25B 4900
Patent
active
040117340
ABSTRACT:
A pressure regulator especially suited for cryogenic fluid and two-phase (gas and liquid mixture) flow application such as an aircraft fuel tank inerting system wherein the regulator controls the pressure and rate of flow of inerting fluid, e.g. nitrogen, into the fuel tank to pressurize the tank and to inert the tank ullage gases to render them noncombustible, said regulator being characterized in that the flow control valve has large and small variable area orifices which operate in sequence to minimize overshoot and undershoot, in that resonant oscillation is predictably damped and the damping remains substantially constant despite wear or change in clearances of the parts, and in that the valve actuator is thermally isolated from the cryogenic fluid flow path.
The use of the tandem or sequential valve seat arrangement aforesaid also allows the larger seat to have an extended life and greater resistance to contamination and wear because at low flow demands, the larger valve portion remains seated and thus does not operate extremely close to its seat while the smaller valve portion partakes of greater stroking relative to its seat to satisfy such low flow demands.
Furthermore, the regulator herein has a configuration such as to produce a large mechanical advantage to enable the regulator to provide a narrow pressure control band even with large variations in inlet fluid pressures and flow demands, this large mechanical advantage being obtained by the use of the rotary motion of a crank shaft having long and short crank arms.
REFERENCES:
patent: 613737 (1898-11-01), Thompson
patent: 799723 (1905-09-01), Dewrance
patent: 814285 (1906-03-01), Gold
patent: 1235541 (1917-08-01), Anderson
patent: 2015977 (1935-10-01), Thrall
patent: 2179824 (1939-11-01), Kip
patent: 2264306 (1941-12-01), Grove
patent: 2627443 (1953-02-01), Becker
patent: 2854990 (1958-10-01), Granberg
patent: 2949128 (1960-08-01), Carter
patent: 2993507 (1961-07-01), Daly
Parker-Hannifin Corporation
Weakley Harold W.
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