Fluid handling – Line condition change responsive valves – Thermal responsive
Patent
1995-06-05
1996-05-21
Hepperle, Stephen M.
Fluid handling
Line condition change responsive valves
Thermal responsive
137486, 137488, F16K 31143
Patent
active
055180256
ABSTRACT:
A dual signal head sensor, which is a fluid pressure differential sensitive control valve, has a diaphragm responsive to changes in fluid pressure on opposite sides thereof and a ported sleeve having a spool valve axially movable in response to diaphragm motion. The head sensor monitors a fluid pressure differential and provides fluidic control signals in response to sensed variations in the pressure differential. A pair of chambers separated by the diaphragm receive variously pressurized fluids and thereby impress across the diaphragm the pressure differential being monitored. The head sensor has a ported sleeve with a high pressure inlet, a low pressure return, two control connections or dual signal outputs, and a movable spool having 4 lands. The spool is effective in certain positions to supply high pressure fluid to the first control connection while coupling the second control connection to the return line, and in other positions, to supply high pressure fluid to the second control connection while coupling the first control connection to the return line. There is a hydraulic coupling between the diaphragm and the spool that allows the diaphragm to move freely in response to variations in the sensed pressures being monitored resulting in modulation and amplification of the pressure forces acting on the movable spool valve. The head sensor includes a device for radially positioning the hydraulic coupling, a resilient spring member for establishing the preferred pressure differential, an external adjustment for fine calibration, and a bi-metallic disk stack for thermal compensation.
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Futa, Jr. Paul W.
Kovac Keith J.
Allied-Signal Inc.
Hepperle Stephen M.
McCormick Jr. Leo H.
Palguta Larry J.
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