Low-differential pressure delay valve

Details Low-differential pressure delay valve Low-differential pressure delay valve

1980-06-02

1981-12-01

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

123339, 1375137, 137510, 137DIG9, F16K 1718, F02M 300

Patent

active

043030955

ABSTRACT:
A low-differential pressure delay valve for vacuum controlled devices is disclosed. The valve has input, output and third chambers with the following: a controlled flow orifice in a separating plate between the input and output chambers; a port in the separating plate; a diaphragm operator sealingly positioned between the input and third chambers; a hollow stem with a seal on one end which stem communicates the output and third chambers by extending through the separating port, input chamber and the diaphragm, the stem is connected to and operative by the diaphragm operator; and, a bias spring of any predetermined force to maintain the port in a closed position is located in either the input or third chambers. The diaphragm operator opens the port to balance the pressures in the input and output chambers when the change in input pressure or vacuum is both greater than the bias force of the spring and too sudden for rapid dissipation through the fixed orifice. At pressure changes less than the bias force of the spring or at such a gradual rate as to dissipate through the orifice the valve will operate as a standard delay valve.

REFERENCES:
patent: 3730154 (1973-05-01), Vartanian
patent: 3996955 (1976-12-01), Kawabata
patent: 4010721 (1977-03-01), Ludwig
patent: 4079750 (1978-03-01), Ludwig
patent: 4098850 (1978-07-01), Tamura
patent: 4168680 (1979-09-01), Kawai et al.
patent: 4182291 (1980-01-01), Ito

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