| 摘要 |
A safety bleeder valve of the globe type for propane gas delivery trucks for preventing the possibility of the accidental or unintentional opening of the valve and escape of gas from the valve when the delivery hose is off its support on the truck and detached from the tank or container being supplied with gas or opening of the valve due to vibration when the vehicle is in motion. The safety valve has end and side walls with an inlet in one end wall and an outlet in the side wall. A threaded stem slides through an opening in the other end wall. A valve head is carried on one end of the stem and adapted to seat on a seat formed in the one end wall. The other end of the stem has a hand wheel for turning the stem. Ratchet teeth on the hand wheel coact with a slidable spring pressed core mounted on the side wall for holding the wheel and stem from rotating. A rotatable ring is provided for connecting the valve body to the inlet of a tank being supplied with gas. Gas bleed means is formed on the valve body for releasing the gas pressure on the rotatable ring to facilitate breaking the connection with the inlet on the tank. Cooperating indicia on the valve body and a skirt of the hand wheel indicate relative wear of a valve head when the hand wheel is rotated to close the valve.
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