Abstract: A thermostatic cartridge assembly for a by-pass valve that regulates fluid flow between two different fluid circuits includes a casing defining a first fluid port and a second port; a thermostatic body having a piston movable along a central axis of the thermostatic body in response to heating and expansion of the thermally responsive material; a cap joined to a second end of the casing; a biasing member urging an end of the piston against a roof of the casing; and a sleeve carried by the thermostatic body, the sleeve having a circumferential side wall and a ceiling that seat against surfaces of the casing to block the first fluid port when the thermally responsive material is at a first temperature, the circumferential side wall blocking the second fluid port when the thermally responsive material is at a second temperature greater than the first temperature.

Abstract: A dual-valve reverse poppet thermostat for use in a vehicle cooling system. The thermostat includes a cup having a temperature sensitive element that actuates a piston causing the piston to move axially upwards. Movement of the piston initiates the gradual opening of a preliminary valve to initiate coolant flow and equalize pressure to open a main valve. The preliminary valve and main valve are biased towards a closed position by biasing spring members.

Abstract: A thermostat having a main valve and a secondary valve is disclosed both of which are biased closed by a single coiled compression spring and opened by a single piston. The entrance to the channel of the secondary valve is maintained at a maximum dimension of approximately 0.015 inches in order to keep undesirable particulate matter out of the valve. The surfaces within the valve channel encourage laminar flow which increases the volume of flow which can be passed through the valve while keeping the total surface area of the valve small.

Abstract: A mounting flange of a thermostat having a seat member including a hard seat and the mounting flange for clamping the thermostat in a counterbore of a thermostat housing has an axial dimension which is less than or equal to the axial dimension of the counterbore. An elastomeric sealing element is interposed between the mounting flange and at least one of the thermostat housing and an engine on which the thermostat housing is mounted.

Abstract: A check valve for an engine cooling system includes opposite ports and a venting plug press fit in one of the ports. The venting plug defines an opening which allows fluid flow through the valve, and a jiggle pin is positioned in the opening. The jiggle pin has a head on one side of the venting plug for sealing the opening, an anchor on the opposite side for retaining the jiggle pin in the opening and a neck connecting the head with the anchor. A bleed notch is defined in a periphery of the opening to permit restricted fluid flow past the venting plug, even when the head of the jiggle pin is sealed. The ends of the check valve have external threads and different diameters for securing the valve in different size opening, and the venting plug can be press fit into its port in either of two orientations so that either the anchor or the head is positioned between the venting plug and the end of the valve.

Abstract: A fail-safe thermostatically operated valve includes a temperature-responsive actuator for moving a valve element between a retracted position and an extended position. The valve includes a first cylindrical member and a second cylindrical member which are releasably connected to one another by a temperature-responsive release device which is responsive to a second predetermined temperature above the normal operating temperature of the valve. A spring arrangement provides return capability for the valve element and overtravel capability for the valve in the normal temperature operating range, and biasing force to move the valve element from the retracted to the extended position when the temperature-responsive release device operates. In one embodiment, the temperature-responsive release device includes a miniature wax-filled actuator in engagement with a mechanical linkage. In an alternate embodiment, the temperature-responsive release device comprises a heat fusible material.