Fluid handling – Diverse fluid containing pressure systems – Main line flow displaces additive from shunt reservoir
Patent
1997-08-18
1999-02-16
Walton, George L.
Fluid handling
Diverse fluid containing pressure systems
Main line flow displaces additive from shunt reservoir
4323, 1372361, 137393, 137395, 137396, 137403, 137907, 141 65, 141198, 406 14, 406192, E03F 100, B65G 5300, F16K 31126, E03C 112
Patent
active
058710272
ABSTRACT:
A vacuum valve controller for a vacuum sewer system having a suction pipe which is communicated with a vacuum system by opening a vacuum valve, and which is cut off from the vacuum system by closing the vacuum valve, so that soil water in a soil water basin is sucked through the suction pipe and sent to a predetermined place by opening said vacuum valve is disclosed. The vacuum valve controller comprises a vacuum valve actuating means movable between a first position and a second position for actuating the vacuum valve between an open position and a closed position, respectively, means for normally biasing the vacuum valve actuating means to the second position, a pressure sensing tube for converting a change in level of soil water in the soil water basin to a change in pressure, a first pressure chamber communicated with the pressure sensing tube and associated with the vacuum valve actuating means for moving the vacuum valve actuating means to the first position when a level in the soil water basin reach a predetermined level, and means for urging the vacuum valve actuating means to the second position while soil water is sucked through the suction pipe. The first pressure chamber is so associated with the vacuum valve actuating means that the pressure chamber is capable of moving the vacuum valve actuating means to the first position while being incapable of moving the vacuum valve actuating means to the second position. By this means, it is possible to prevent the vacuum valve from moving to the closed position while the soil water is sucked through the suction pipe even if a negative pressure is established in the first pressure chamber whereby any water-hammer may be prevented.
REFERENCES:
patent: 3853138 (1974-12-01), Amren
patent: 4603709 (1986-08-01), Huisma
patent: 4691731 (1987-09-01), Grooms et al.
patent: 5069243 (1991-12-01), Foreman
patent: 5588458 (1996-12-01), Ushitora et al.
patent: 5615701 (1997-04-01), Yamabe et al.
Shimizu Osamu
Ushitora Akihiro
Ebara Corporation
Walton George L.
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