Shut-off valve

Details Shut-off valve Shut-off valve

G - Physics

05

D

137/95

G05D 16/00 (2006.01) F15B 1/027 (2006.01)

Patent

CA 1238258

SHUT-OFF VALVE ABSTRACT The invention relates to a shut-off valve equipped with two pilot-valves and a main control- piston, the said valve connecting in inlet with an outlet when an upper switching pressure is reached and breaking this connection again when the pressure drops to a lower switching pressure. In order to reduce leakage and to improve the switching process, the pilot-valve (12), which determines the lower switching pressure, is in the form of a seat-valve held open by spring-force, the said pilot-valve closing off a control-line when the lower switching pressure is exceeded, and a second flow-path (21) being provided which is interrupted both by the main control-piston (3), in the shut-off phase, and by the pilot-valve (13) which determines the upper switching pressure, at least when, and shortly after, the shut-off (see drawing).

463723

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