Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1987-09-21
1989-08-01
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
13750513, 137510, 251 57, G05D 701
Patent
active
048526061
ABSTRACT:
A pillar tap has a main water chamber and a control chamber housed within the main chamber. The control chamber has two different sized openings. The smaller opening which is located opposite the main outlet valve seat of the main chamber supports a membrane. The membrane in turn supports a valve member for movement into and out of engagement with the valve seat. The larger of the two openings is closed by a resilient diaphragm. A pair of control valves and control the admission and release of water to and from the control chamber. By controlling the control valves and the pressure differential between the main and control chambers and can be varied and so used to control the degree to which the valve member is opened. Once the flow rate through valve seat has been set, the diaphragm responds to pressure variations in the main chamber to alter the position of the valve member in a sense to maintain a substantially constant flow rate irrespective of the pressure variations.
REFERENCES:
patent: 2942619 (1960-06-01), Jackson
patent: 3113756 (1963-12-01), Griffo
patent: 3123094 (1964-03-01), Toschkoff
patent: 3216441 (1965-11-01), Thorsheim
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