The hot water stream expansion that noise is reduced when the boiler hot water cushion of check valve apparatus of the present invention can close up reduces damage and valve plate due to heater. The inside of the hot water mat of check valve apparatus boiler forms water container, and there is inflow pipe to connect with discharge pipe in heater, and water is heated, while being flowed in water, and prevent the hot water heated by heater and opposing steam flow to water tank. Delivery pipe back plate water container outstanding. Check valve apparatus is mounted on the delivery pipe of the face side connection of backboard, is internally positioned water tank. The invention is characterised in that including installing back plate connection delivery pipe on the front side of valve box and being located at water tank and the rear side with opening, closed front end, and closed circumference; Guiding axis from the valve casing of foreboard backward; It backward and enumerates into water metering-orifice in the case where the foreboard of inflow unit circumference guiding axis outstanding and is formed in center periphery; A kind of spring insert enters inlet unit; Valve block is inserted into before and after guide shaft by the center including through-hole, the Rear springs including adhering to rear surface, when closing water inflow hole forward movement; The guiding axis formed on the rear side of locating snap ring is to prevent seperating vale piece; And valve seat when forming valve chest around air element and discharging the pressure of air in valve chest is predetermined value or higher. ;The 2015 of copyright KIPO submissions
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