Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1991-01-23
1992-06-30
Michalsky, Gerald A.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
1375122, E03C 110
Patent
active
051254298
ABSTRACT:
A pressure-type vacuum breaker for use in a fluid flow line has a housing defining a central bore and an inlet, an outlet and a discharge vent. A piston assembly disposed within the central bore is movable within the bore between first and second positions. In the first position of the piston assembly, the inlet is closed, the discharge vent is open and the outlet is in communication with the discharge vent and the atmosphere. In the second position of the piston assembly, the discharge vent is closed, the inlet is open and the outlet is in communication with the inlet, thereby to permit liquid flow between inlet and outlet. The position of the piston assembly is in predetermined response to pressure of liquid at the inlet.
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"Series 800 Anti-Siphon Pressure Type Vacuum Breakers", Watts Regulator Comany, PS-800-6, ES-800-6 898 IS-800-4, IS-800-4 881 (undated).
Ackroyd Rand H.
Hofmann Steven P.
Michalsky Gerald A.
Watts Regulator Company
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