|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||251/634 ; 92/63 ; 92/152 ; 251/635|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 12 인용 특허 : 7|
A gas cylinder valve for high pressure gas cylinders includes a pneumatic actuator with tandem pistons which are operated by normal industry “house”pneumatic pressures to overcome the large closing bias force generated by a set of disc springs so that the valve opening spring can lift the valve stem from its seat. A floating pressure plate which seats against an annular internal shoulder in the actuator housing prevents pneumatic pressure applied to the upper piston from acting on the back of the lower piston. Pneumatic pressure from a common source is a...
A pneumatic actuator for a cylinder valve having a valve stem member which is biased away from a valve seat by a first spring to open the valve, said actuator comprising: a hollow cylindrical housing having an end wall at one end thereof; connection means secured to the end wall of the actuator housing mounting said actuator on the cylinder valve, said connection means and end wall defining an aperture through which said valve stem member extends; a first piston slidable in the actuator housing and forming with said end wall a first actuator chamber; a s...