Abstract: A parking sustainer which allows a vehicle to be maintained parked by continuing a braking action if the depression of a brake pedal is terminated. An open/close valve is disposed in a liquid pressure discharge passage usually provided in a liquid pressure booster, and control means closes the open/close valve when a set of conditions to maintain the vehicle parked are satisfied. The provision of the open/close valve in the discharge passage of the booster eases the space requirement for its mounting and facilitates a maintenance inspection or repair.

Abstract: In an apparatus for forming leak-proof joints between tubes and a tube sheet by the internal application of hydraulic swaging pressure, the flow of relatively low pressure fluid from a pressure source to an intensifier is permitted or interrupted by a control valve. During a prefill period, a prefill valve causes the low pressure fluid to bypass the low pressure input side of the intensifier and flow directly to the high pressure side and then to a mandrel. Thereafter, the low pressure fluid is caused to enter the low pressure side of the intensifier to increase the pressure in the mandrel during a swaging period. A pressurization sensor, which is connected to the input and output sides of the prefill valve, contains a piston which is movable in response to the difference in the pressures at these two points to produce a termination signal which, after a delay, actuates the control signal at the end of the swaging period.

Abstract: In an apparatus for forming leak-proof joints between tubes and a tube sheet by the internal application of hydraulic swaging pressure, the flow of pressurized fluid from an adjustable pressure reduction valve is permitted or interrupted by a control valve. An actuator moves the control valve between its flow permitting and interrupting positions in response to a control signal. In the sensor, which is connected to the input and output sides of the control valve, a piston is movable in response to the difference in the input and output pressures to produce the control signal when a predetermined comparative pressure relationship exists.

Abstract: A heat-powered water pump including a flexible diaphragm as the pumping element with a volatile liquid as a working fluid. The flexible diaphragm is enclosed within a vessel and isolates the working fluid from the water to be pumped. One-way valves control the direction of water flow through the pump. A U-shaped siphon tube acts as a temporary reservoir for the pumped water and is siphoned empty after being filled. A portion of the water siphoned from the U-shaped siphon tube is recirculated through the vessel in heat exchange relationship with the working fluid to condense the working fluid. A reservoir of warm water is maintained in thermal contact with the flexible diaphragm to minimize condensation of the working fluid by thermal contact with the water through the diaphragm.