F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
341/39
F04B 49/00 (2006.01)
Patent
CA 1160319
ABSTRACT OF THE DISCLOSURE When heavy duty electric pumps as those used in muni- cipal water mains and sewage systems are operating, they are working against the static pressure of the lines already full of liquid and usually flowing upgrade from the pumping station for a long distance, to water storage tower or point of dis- charge. This mass of water flowing away from the pump of course has momentum. The outlet of the pump into the main is through a heavy duty check valve to prevent back flow of water from the pipe into the pump. When there is a breakdown of a pump or motor, or less power to the pump when it is work- ing, the sudden drop in pressure in the main with the volume of water in the main still in motion, a shock wave is set up in the pipe line that travels with the speed of sound toward the discharge point or first high point in the line, and it reverses with amplified force back to the pumping station which will open the line to a drain to relieve the force of the returning shock wave. If this valve opens immediately upon stoppage of the pump vast amounts of water will be spill- ed from the system, perhaps with no provision for its adequate disposal. The present invention introduces a time delay relay system at the pumping station that delays the opening of the surge valve for a preset period of time but in advance of the return shock wave that will spill enough water from the main before the shock wave returns to break the force of the returning shock wave to dissipate harmlessly.
374560
Lescovich Joseph E.
Salina Louis E.
Ga Industries Inc.
Marks & Clerk
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