| 摘要 |
A valve for use in selectively filling a charge of liquid or gas into a pressure vessel and releasing a stream of gas from the vessel comprises: a housing (1) that defines a pathway for the liquid or the gas, and also defines an outer valve seating (103); a first valve body (5) biased into engagement with the outer valve seating to close the pathway; a first actuator member (108) adapted to disengage the first valve body to open the pathway; parts defining a channel (104) through the first valve body to define a by-pass continuous with said pathway, the channel having an associated inner valve seating, a second valve body 4 biased into engagement with the inner valve seating to close the by-pass; and a second actuator member (4a) adapted to disengage the second valve body to open the by-pass. <IMAGE> |
