|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||137/527 ; 137/5157|
|발명자 / 주소|
|인용정보||피인용 횟수 : 23 인용 특허 : 11|
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.
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...