Abstract: A vapor vent control valve arrangement for a fluid tank is disclosed. The valve arrangement includes a solenoid operated valve with a normally-open parallel switch assembly and a normally-closed switch in an electrical circuit to activate the solenoid valve. An impact switch may also be provided as a safety precaution in the series circuit. The valve assembly is spring-biased to provide an over-pressure check valve function and also includes a back-pressure relief valve.

Abstract: A thermally actuated valve includes a snap action bimetal valving member enclosed in a cartridge which is inserted in a hollow fitting arranged for contact with a heated medium such as the coolant of an internal combustion engine.

Abstract: A vacuum relay valve for isolating a vacuum operated dependent device from a contaminated vacuum signal source includes a check valve and an atmospheric bleed valve arranged such that a negative-going pressure change in the vacuum source causes the check valve to open and the bleed valve to close, permitting evacuation of the vacuum operated device by flow toward the source, while a positive-going pressure change in the vacuum source causes the check valve to close and the bleed valve to open thereby isolating the vacuum operated device from the signal source and permitting the pressure in the device to rise by infusion of atmospheric air. The relay valve may include a timing restriction arranged for isolation from the signal source, which is purged by unidirectional flow each time the device is evacuated.