|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||137/269 ; 138/45 ; 251/207|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 31 인용 특허 : 0|
The through hole of the ball of a ball valve which resembles a cock is provided with an orifice on the side wall thereof. Opposite to the orifice on the side wall of the through hole is provided another through hole. By revolving the ball, the ball valve selectively serves as a ball valve or an orifice.