Fluid handling – Processes – Carbonated beverage handling processes
Patent
1974-08-14
1976-04-27
Schwadron, Martin P.
Fluid handling
Processes
Carbonated beverage handling processes
1374875, 73 405R, 23515134, F16K 3100
Patent
active
039527590
ABSTRACT:
System and method for automatically closing flow control valves and/or actuating an alarm in the event of a leak or break in a liquid pipeline. The occurrence of a leak or break is determined first by detecting the negative pressure wave which accompanies the leak or break and then by monitoring the rate of static pressure drop on the downstream side of the valve. False alarms and undesired valve closing in response to normal disturbances in the line are avoided by distinguishing between negative pressure waves originating on the upstream and downstream sides of the valve and responding only to the negative waves of downstream origin. Additional protection is provided by continuously monitoring the static pressure on the upstream side of the valve and closing the valve and/or actuating the alarm in the event that pressure falls and remains below a predetermined level.
REFERENCES:
patent: 3612081 (1971-10-01), Williams
patent: 3665945 (1972-05-01), Ottenstein
patent: 3776249 (1973-12-01), Wailes
patent: 3851521 (1974-12-01), Ottenstein
M & J Valve Company
Miller Robert J.
Schwadron Martin P.
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