Abstract: A sump apparatus for use in a marine vessel comprises a tank, a pump communicating with the tank for evacuating the tank, and a pump control mechanism for energizing the pump in response to a predetermined height of water in the tank. That mechanism comprises a housing defining an air chamber, a switch disposed in the chamber and operably connected to the pump, a switch actuating diaphragm mounted in the housing for actuating the switch. An air vent conduit communicates with the chamber, and a flow restrictor desensitizes the diaphragm relative to momentary changes in the water pressure acting on the diaphragm. The pump control mechanism can be mounted in a side wall of the tank, or to a removable top lid of the tank so as to be removable with that lid. The pump control mechanism may include a timer operably connected to the switch and pump for deactivating the pump after a predetermined period of pump operation sufficient to evacuate the tank.

Abstract: A fluid pressure device for detecting two or more fluid pressure levels from a varied range of fluid pressure includes a housing having a cylindrical bore and a pressure inlet in communication therewith. A piston member is reciprocably movable within the cylindrical bore. A piston rod extends from the piston member and projects outward of the housing where a switch-operating arrangement is secured. The switch-operating arrangement includes an interlocking arm and a number of blocking elements corresponding to the number of switch devices to be operated. Guide slots formed in the interlocking arm allow adjustment of the position of the blocking elements, thus affecting a change in the operating points of the switch devices. Surrounding the piston rod within the housing is a multiple-spring arrangement which opposes the movement of the piston and which exhibits a nonlinear spring coefficient.

Abstract: The electrically operated clutch controlling operation of the compressor is regulated by a damped pressure switch. The pressure switch has a diaphragm which moves in response to pressure variation to actuate the switch. The force acting on the diaphragm is opposed by spring force. The housing is provided with a damping chamber between the diaphragm chamber and the restricted passage in the inlet. The restricted passage is the clearance between the hole drilled in the metal insert and the wire fixed in the hole. The restriction is selected relative to the damping chamber so the switch will not cycle more than four times per minute when sensing pressure at the outlet of a finned coil evaporator in an automotive air conditioning system operating under light load.

Abstract: A small-sized differential piston unit is disclosed. The piston unit has a cylinder filled with liquid medium and a piston slideably mounted in the cylinder. An operation rod is operatively connected to said piston. An improved sealing member consisting of a membrane is used to completely seal the liquid medium in the cylinder. Control means is provided for imparting fluid resistance caused by the liquid medium to the piston differently between its forward movement and backward movement in the cylinder.

Abstract: A variable fluidic time delay system for operating a plurality of pressure sensitive control switches to effect sequential operations at different pressure settings or for different components in response to the fluid pressure at a predetermined location in a refrigeration system, the time delay system including a fluid flow restrictor and unidirectional flow control in parallel by-pass relation with each other and connecting the control switches to the predetermined location of the refrigeration system for restricting pressurized fluid flow with a concomitant time delay in one direction and providing unrestricted fluid pressure equalization in the other direction, respectively.

Abstract: An adjustment mechanism for a pneumatic timing device, that operates relay contacts with a time delay, in which a needle valve is aligned longitudinally with a bellows and the needle valve is operated by a rotatable adjustment knob that operates a visual indicator through a reduction gearing.

Abstract: An illuminating device having an L-shaped housing with a light source at each end, a diaphragm actuated switch for each light source, an air line in fluid communication with each leg of the housing, and a tube interconnecting the housing legs for permitting water to flow between the respective legs. The actuation of the switch is determined by the orientation of the housing and the flow of water between the respective legs.

Abstract: A pressure switch comprising a housing and a movable pressure responsive diaphragm in the housing cooperating therewith to define a sensing chamber. The housing has an inlet passage leading to the sensing chamber and a vent passage leading from the sensing chamber. A check valve allows fluid to flow through the inlet passage into the sensing chamber and prevents flow through the inlet passage in the reverse direction. A pressure relief valve at least partially vents the sensing chamber through the outlet passage in response to the differential pressure across the pressure relief valve reaching about a predetermined magnitude. At least a portion of the diaphragm is movable along a path in response to pressure changes in the sensing chamber and an actuator is carried by the movable portion of the diaphragm. A switch is mounted on the housing in a position to be actuated by the movement of the actuator.

Abstract: A pneumatic timer translating the external force of an electromagnetic relay or the like into rotational movement of a camshaft to actuate a set of switch contacts. The rotation of the camshaft is retarded in one direction by an adjustable pneumatic one-way time delay mechanism. The timer is capable of two modes of operation, on delay and off delay, according to choice of camshaft configuration and orientation.

Abstract: Oil pressure delay check valve and pressure switch for unattended Diesel engine to shut off the fuel supply valve after a low oil pressure signal, and to delay opening of the valve for a predetermined time interval. This delay is attained by the closing of a normally open pressure switch upon pressures decreasing from the order of 8 psi and by bleeding the oil pressure past a check valve through a bleeder tube in cooperation with an accumulator, from a pressure in the order of 8 psi to a pressure in the order of 5 psi to accommodate the opening of a normally closed switch as the pressure decrease from the order of 5 psi. The two switches are in series and when closed, energize the solenoid of an electrically energizable valve to shut off the supply of fuel to the Diesel engine. As the oil pressure decreases, one pressure switch will close and remain closed while the other pressure switch will open in a predetermined time delay interval and effect opening of the fuel supply valve.