|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||251/26 ; 60/652 ; 91/27 ; 91/31|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 9 인용 특허 : 4|
A fast opening valve apparatus includes an electronic sensing circuit to determine when a positional error signal exceeds a predetermined reference value corresponding to an opening rate reference value. The sensing circuit provides a fast open command signal which is applied to a solenoid valve which is hydraulically coupled in parallel with a control servo valve. The control servo valve hydraulically couples a primary source of hydraulic fluid under pressure to a valve actuator which is mechanically coupled to a valve stem of an associated steam valve ...
A fast opening valve means for rapid actuation of a steam valve actuator, said valve actuator responding to hydraulic fluid supplied thereto from a source of hydraulic fluid through a control servo valve, and said valve actuator for positioning a valve stem of a steam valve in accordance with a control error signal supplied to said control servo valve, wherein the control error signal is representative of the difference between a demand control signal and a position feedback signal, the position feedback signal corresponding to the position of said valve...