Fluid handling – Systems – Multi-way valve unit
Patent
1975-10-02
1976-08-31
Weakley, Harold W.
Fluid handling
Systems
Multi-way valve unit
13762527, 13762568, F16K 1700
Patent
active
039774384
ABSTRACT:
Reset means to advance a valve spool from a first valve seat to a second valve seat in opposition to exceedingly high biasing fluid pressure comprises a manually rotatable actuating means in screw threaded engagement with the body of the pilot valve. With the manually operable actuator at its retracted position, means is manually operated to operatively connect the manual actuator to the valve spool to permit advance of the manual actuator to drive the valve spool from the first valve seat to the second valve seat against the resistance of the biasing fluid pressure. In consequence of the advance of the valve spool to the second valve seat, an opposite fluid pressure progressively rises to a normal operating range at which it dominates the biasing fluid pressure to hold the spool against the second valve seat independently of the manual actuator and this rise of the opposite fluid pressure to the normal operating range automatically releases the connecting means to give the valve spool freedom for subsequent retraction by the biasing fluid pressure in the event that the dominating fluid pressure falls below its normal operating range.
REFERENCES:
patent: 3610284 (1971-10-01), Spencer
patent: 3874414 (1975-04-01), Dollison
patent: 3877484 (1975-04-01), Theriot
Cove Harry R.
Muchow John D.
Weakley Harold W.
Weilein Paul A.
Willis Oil Tool Co.
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