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A check valve comprising a valve body with a bore and a counterbore, an insert inside the counterbore, and a flapper with a flapper pin is disclosed. The flapper pin is mounted in a recess in the inside face of the insert. A spring for biasing the flapper toward the closed position is located in a r

A check valve comprising a valve body with a bore and a counterbore, an insert inside the counterbore, and a flapper with a flapper pin is disclosed. The flapper pin is mounted in a recess in the inside face of the insert. A spring for biasing the flapper toward the closed position is located in a recess in the counterbore face of the valve body.

대표청구항 ▼

A check valve comprising: (a) a valve body having a bore therethrough for the flow of fluid and in the bore a counterbore whose diameter is larger than that of the bore, the counterbore having a counterbore periphery and a counterbore face inside the valve body, the counterbore face being at an angl

A check valve comprising: (a) a valve body having a bore therethrough for the flow of fluid and in the bore a counterbore whose diameter is larger than that of the bore, the counterbore having a counterbore periphery and a counterbore face inside the valve body, the counterbore face being at an angle to the axis of the bore, the counterbore face having a biasing means recess; (b) an insert contained at least partially in the counterbore, the insert having (i) a bore therethrough for the flow of fluid, (ii) an outer periphery that corresponds to and mates with the counterbore periphery, and (iii) an inner face that corresponds to the counterbore face, the inner face having a flapper pin recess; (c) a flapper having a flapper pin, the flapper pin being rotatably mounted in the flapper pin recess of the insert so that the flapper can rotate between open and closed positions, the closed position blocking the bore of the insert to prevent substantially the flow of fluid through the bore; (d) biasing means mounted in the biasing means recess of the valve body to bias the flapper towards the closed position; and (e) blocking means inside the valve for blocking the flapper pin recess to prevent the flapper pin from leaving the flapper pin recess and for blocking the biasing means recess to prevent the biasing means from leaving the biasing means recess.