Fluid handling – Pressure modulating relays or followers
Patent
1989-06-23
1990-08-21
Cohan, Alan
Fluid handling
Pressure modulating relays or followers
137469, G05D 1600
Patent
active
049497464
ABSTRACT:
A fluid control valve having a discharge port controlled by an obturator is characterised by the discharge port being shaped to cause a marked drop in back pressure at a small critical opening distance of the obturator from the port, thereby to provide impetus to initiating discharge. The discharge port has effectively a concave surrounding surface for this purpose. To achieve good sealing with light loading, the port preferably also has a convex surface immediately surrounding its orifice. The preferred configuration is a convex surface bounded by a wall. The obturator may be resiliently loaded to enable its response to dynamic effects of fluid flow to enhance opening "lift". The obturator may be, e.g. a lever, a diaphragm or the armature of a solenoid.
REFERENCES:
patent: 1963267 (1959-04-01), Bancroft
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patent: 3982554 (1976-09-01), Saito
patent: 4196751 (1980-04-01), Fischer et al.
"The Development of Some Low Pressure Jet Sensing Techniques", F X Kay, Sep. 1973.
Cohan Alan
F.X.K. Patents Limited
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