Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1986-01-27
1986-10-14
Weakley, Harold W.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
137115, 1374842, 1374846, F16K 1734
Patent
active
046166726
ABSTRACT:
A pressure relief and drain valve includes a poppet valve on a valve body movable in a primary valve chamber between closed and open positions and spring biased to the closed position. A secondary valve slidable on the poppet valve cooperates therewith and with the valve body in defining a variable volume secondary chamber within the primary chamber. Passages in the poppet valve connect the fluid circuit upstream of the poppet valve with the secondary chamber and drain orifices in the poppet valve connect the secondary chamber with a sump. When the net fluid pressure force on the poppet valve in the opening direction exceeds the spring force, the poppet valve opens for pressure relief. The fluid flows over a suction surface on the poppet valve when the latter is open and the pressure drop at the suction surface proportional to the flow velocity is communicated by the passages to the secondary chamber so that the valve opens further and the pressure drop across the valve is substantially constant. When the fluid circuit is unpressurized the secondary valve opens the drain orifices so that the circuit drains through the passages, the secondary chamber and the orifices.
REFERENCES:
patent: 1994320 (1935-03-01), McLaughlin
patent: 2859762 (1958-11-01), Banker
General Motors Corporation
Schwartz Saul
Weakley Harold W.
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