Abstract: An inventive dual plate check valve is provided which comprises a central anchoring fixture and an elastomer hinge fixed to the central anchoring fixture by a center post clamp. Two opposing sections of the elastomer hinge are formed on opposing sides of the center post clamp, and at least one disc member is attached to each opposing section of the elastomer hinge to form a valve plate which is pivotable about the center post clamp. In one embodiment, the central anchoring fixture forms projections on opposing sides of the center post clamp such that the lower edges of the valve plates are prevented from sliding off of the upper surface of the central anchoring fixture. In another embodiment, a stop pin is provided which extends vertically between the valve plates.

Abstract: A heating and pressurization system for a liquid-cooled engine having a cooling system is provided. The heating and pressurization system includes a coolant circulation and pressurization system comprising a coolant tank, a coolant pump receiving coolant from the coolant tank through a manifold, a coolant outlet conduit, and a coolant inlet conduit. The coolant outlet conduit and coolant inlet conduit each have an end which has a double dry break quick disconnect coupling which is detachably fixable to the cooling system of the engine and to another double dry break quick disconnect coupling attached to the coolant tank though an access passage. An immersion heater is incorporated into the coolant circulation and pressurization system which is operable to heat coolant circulating therein.