| 摘要 |
A safety and service valve for a high pressure tank having a sealing portion within the tank, an external portion externally of the tank, a flow passage between inlet and outlet ports, and a chamber having an inlet end and an outlet end, the outlet end having a valve seat. A valve element is loosely received by the chamber and adapted to engage the valve seat to thereby close the flow passage when the fluid pressure at the chamber inlet end is higher than the fluid pressure at the chamber outlet end. A stop member prevents the valve element from engaging the valve seat until the external portion of the body is severed from the sealing portion. In one aspect, the valve includes a bleed passage in the sealing portion of the valve for placing the tank in fluid communication with the flow passage and allowing release of pressure in the tank in a safe manner if the external portion of the body is severed from the sealing portion. In another aspect, the valve element is a ball of deformable material wherein the diameter of the ball and the diameter of the passage are selected such that if the external portion of the valve body is severed from the sealing portion, the valve element is forced out through the passage allowing release of pressure in the tank if the pressure exceeds a predetermined magnitude.
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