A - Human Necessities – 01 – G
Patent
A - Human Necessities
01
G
137/34
A01G 25/00 (2006.01) A01G 25/16 (2006.01) F16K 31/00 (2006.01)
Patent
CA 1273858
ABSTRACT OF THE DISCLOSURE A flow control valve is provided in which a moisture expansible body is adapted to close a bleed valve shutting off a bleed from an inlet chamber through a by-pass to the underside of a thrust plate operatively coupled by a rod to a valve member arranged to close communication between the inlet and an outlet chamber. on absorption of moisture, the body expands to drive thrust rod downwards to close the bleed valve whereby pressure under the thrust plate is relieved and inlet water pressure closes valve member to cut off discharge. On drying the body shrinks relieving thrust rod pressure on the valve which opens under inlet pressure and pressure liquid is bled through passages and the by-pass to drive the thrust plate upwards to open valve member and allow liquid flow from the inlet to the outlet chamber and to discharge. The expansible body may be moistened by ambient moisture or controlled wetting may take place by a bleed from the outlet chamber leading via an adjustable throttle valve into an apertured casing containing the body of expansible material.
509135
Hamilton Malcolm Frank
Ridout & Maybee Llp
LandOfFree
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