Abstract: A freeze protection plug has latching balls engageable bayonet-fashion with grooves in a fitting. The balls are normally held in engagement with the grooves by a cam, but move inward to release the plug from the fitting when the cam is moved by a thermal actuator carried by the plug. The balls are retained in tapered openings in the wall of the plug to reduce jamming. Helical ramps in the grooves permit the use of a strong, reliable plug ejecting spring, and make manual insertion of the plug easy. Insertion is aided by the ribs of a plastic cap, which facilitate manual grasping and rotation of the plug. A paint shield ring prevents failures resulting from paint bridges adhering both to the plug and to the fitting. A unitary molded lanyard with two oval loops prevents loss of the plug. The seal on the plug is located on the liquid system side of the latching balls and isolates moving parts from the liquid system, and is of small diameter.

Abstract: A down flow, two tank, two pass radiator includes a flow division baffle in the center of the upper tank that automatically vents any air trapped behind the baffle as the engine operates. When the engine starts, colder coolant has contracted a thermo wax operated baffle slide to an open position, allowing any trapped air to vent through. As the engine and coolant warm to normal operating temperature, the wax expands, pushes the slide closed, and the baffle operates as a solid piece.

Abstract: A thermal relief valve to be mounted in a fluid flow line. The valve comprises a valve body and a valve actuator movable in a bore defined by a bore wall in the valve body from a sealing position in which the actuator sealingly engages a valve seat to block flow through the valve to a non-sealing position. The valve actuator is responsive to the temperature of the fluid exceeding a predetermined temperature to move to its non-sealing position. The relief valve has an actuator body configured to have first exterior surfaces sized for a close clearance fit with the bore wall at spaced locations around the actuator body to prevent substantial lateral shifting of the body relative to the bore wall, and second exterior surfaces which extend between the first exterior surfaces and which are spaced farther from the bore wall to define flow passages to permit the flow of fluid past the actuator when the valve actuator moves to its non-sealing position.

Abstract: A thermo-actuator has a steel rod, a guide member slidably mounted on the rod, a spool seal secured to the guide member, a heat conductive cylinder secured to the guide member, and wax pellets provided in the cylinder. The spool seal has a thin layer, so that the spool seal engages with the rod by a vacuum generated in the spool seal. The thickness of the spool seal is between 5% to 25% of the diameter of the steel rod.

Abstract: A system for controlling the heating of diesel fuel in a fuel tank of a diesel engine system to prevent diesel engine control electronics damage. The system is operable to bypass heat exchange medium flow at predetermined temperature ranges to prevent further heating of diesel fuel in a diesel fuel reservoir tank by the heat exchange medium. More particularly, this mechanically operated system permits identical temperature control means for controlling various temperatures of hydraulic oil in hydraulic oil reservoir tanks. The system may also be utilized to facilitate flow of a heat exchange medium which cools fluid in either diesel fuel or hydraulic oil reservoir tanks.

Abstract: A control apparatus used for a heat exchanger having a casing through which a first fluid flows and a tube disposed within the casing for a second fluid to flow therethrough, thereby allowing a heat exchange to occur between the first and second fluids, the control apparatus being so arranged as to change the flow rate of the second fluid in accordance with a change in temperature of the first fluid so as to maintain the temperature of the first fluid at a constant level, comprises a valve housing having a valve seat and communicating with an inlet port of the tube, a valve body disposed in the valve housing and movable between a closing position where the valve body is placed on the valve seat to prevent the second fluid from flowing into the tube and an opening position where the valve body is separated from the valve seat to allow the second fluid to flow into the tube.

Abstract: Thermostatic sensor for controlling radiator valves either directly or by remote control, comprising a cup-like metallic vessel (1) with a compressible plastic bellows (3) and a means (6) for effecting control movements in response to expansion or contraction of the bellows. The bellows is fabricated by blow-molding from a plastic preferably, an acetal plastic. The space between the vessel and the outside of the bellows is hermetically enclosed and filled with a wax medium (2) with high coefficient of thermal expansion. A sensor of this type is produced in one way by inserting wax in freely-fluid condition into the vessel (1), after which the bellows in compressed or sucked-together condition, preferably having expelled air from between the bellows walls thereof, is dipped down into the fluid medium and is there allowed to expand again, after which the vessel is closed by means of a washer or the like.

Abstract: A thermal element having a tubular casing with an open end, a volume of heat-responsive, expandable wax positioned in said casing at a distance from the open end thereof, a spherical resilient seal member compressively positioned in the casing adjacent said wax, a motion-transmitting pin extended between the seal member and the open end of the casing and having a relatively soft washer affixed thereto for engagement against the seal member and with at least one peripheral notch in the washer permitting flow of liquid thereacross.

Abstract: A thermostatic control valve for regulating the supply of fluid through a conduit includes in combination a valve plate and seat in the conduit, the valve plate having a valve stem extending outwards of the conduit with the valve stem having a spring exterior of the conduit to move the plate away from the seat and a housing secured to the conduit with a retractable plunger in the housing operative on the valve stem. The plunger is contained in a casing having means responsive to temperature change to move the plunger towards the seat. An interior member is threaded in the housing and removable means are used for attachment to the interior member to rotate it in the housing, thus providing adjustment. The control valve is secured to the conduit through a washer having a pawl which engages with ratchet shaped teeth of a ring secured in the control valve.

Abstract: A fire sprinkler valve with a valve member coupled to a primary temperature responsive control mechanism that is activated to open the valve in response to ambient temperatures above a given temperature level and that urges the valve toward closed position in response to temperatures below that level. An auxiliary control causes automatic reclosure of the valve only in response to a decrease in an ambient temperature to below the given level.

Abstract: A three-way changeover valve construction having a housing means provided with an inlet and a pair of outlets. A pair of valve seats are carried by the housing for respectively controlling fluid flow from the inlet through the outlets. A pair of valve members are provided for respectively controlling the valve seats with the valve members being operatively associated together to move substantially in unison relative to the valve seats in response to a condition sensed by a condition responsive device. A changeover device is operatively associated with the valve members to position the same to act respectively on one side of the pair of valve seats or on the other side of the pair of valve seats to change the valve construction from a cooling function thereof to a heating function thereof in response to a temperature change in the flowing medium.