| 主权项 |
1. A gas operated valve, including:
a housing having an upper portion and a lower portion; an actuator having a piston disposed in the upper portion, a plate disposed in the lower portion, and a rod connecting the piston to the plate; and a spring disposed in the lower portion, the spring having a central opening defined by a plurality of coils and being movable between an expanded state and a compressed state, the central opening being closed on one end of the spring by a wall of the housing and on the other end of the spring by the plate; wherein the upper portion of the housing has an inlet opening to receive control gas exterior to the housing, and the lower portion of the housing has an inlet opening to receive supply gas and an outlet opening to provide the supply gas to an application; and wherein the amount of supply gas flow from the lower portion inlet opening to the outlet opening varies with movement of the spring between the expanded state, wherein supply gas flows into the lower portion inlet opening, into the central opening of the spring, out of the central opening through gaps between the coils, and out of the lower portion through the outlet opening, and the compressed state, wherein the coils are in contact with one another thereby substantially preventing supply flow between the lower portion inlet opening and the outlet opening, the movement of the spring being controlled by movement of the actuator in response to pressure of the control gas at the upper portion inlet opening. |
