Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1979-04-02
1981-03-31
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137403, F16K 3136
Patent
active
042587476
ABSTRACT:
A vacuum operated sewage system includes a static pressure sensor establishing a trigger signal at a selected first level in a standpipe. The sensor is connected upstream of a discharge control valve and actuates a trigger and timer controller at the selected sensed pressure to establish low for a predetermined period. A suitable time delay capacitor in the controller prevents transient signal actuation. A system pressure interlock senses the vacuum level of the system to disable the timer controller if system pressure is below a selected level. The interlock may include a pressure level control valve connected to bleed the capacitor and disable the timer controller. A system pressure sensing valve in parallel with the level control valve decouples the latter as long as the system level is above the selected minimum and thereby permits normal controller operation.
REFERENCES:
patent: 3777778 (1973-12-01), Janu
Cohan Alan
Johnson Controls Inc.
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