(under subclass 15) Subject matter in which a manually controlled valve and a fluid actuated or retarded shut-off valve are sequentially arranged in the flow line so that flow takes place only during the time both valves are open.
(1) Note. The shut-off valve is usually a safety or loss preventing valve intended to prevent prolonged use of the fluid under external control or loss in case of rupture of a hydraulic line. They are frequently called hydraulic fuses.
(2) Note. Since these valves are reset only by operation of the manual valve they are included here even if claimed as a subcombination.
SEE OR SEARCH CLASS
137, Fluid Handling,
102+, for devices, sometimes called "hydraulic fuses", in which flow between a pump and distributor valve is interrupted after an interval unless exhaust flow from the distributor valve to the reservoir occurs; subclass 467 for valves which open in response to a change in line condition and require resetting, and subclasses 613+ for distributing systems comprising a single flow path with plural serial valves and/or closures.
