Valves

Details Valves Valves

1989-08-18

1990-12-25

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Flow rate responsive

137362, 137881, F16K 31126

Patent

active

049795295

ABSTRACT:
A fluid supply system (10) for delivering a supply fluid to a washdown facility and for automatically diverting contaminated run-off to the sewer. The fluid supply system (10) includes a demand valve (13) connected in series in a supply line (11). The demand valve (13) is attached to a control line (14) which leads control fluid to a diversion valve (15) located in a sump (16). The demand valve (13) can operate either under upstream or downstream control to activate the diversion (15). In order to avoid inadvertent operation of the diversion valve the demand valve (13) includes a control valve member (33) and a pressure plate (32) which permits a small flow of fluid along the line such as may be experienced by a dripping tap. When the flow along the supply line exceeds a predetermined level the demand valve operates to divert control fluid to the diversion valve (15) to fill a variable volume chamber (48) and thereby unseat a diversion valve member (45) to open the diversion valve (15). The diversion valve (15) includes a needle valve (55) to control the bleed of fluid from the variable volume chamber (48) at a predetermined rate as the diversion valve closes so there is a time delay between shut off of the demand valve (13) and closure of the diversion valve (15). The time delay is to allow for excess run-off of waste fluid from the washdown facility.

REFERENCES:
patent: 3240222 (1966-03-01), Heil
patent: 4039005 (1977-08-01), Clifford

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