| 摘要 |
The upper portion of the valve body encloses the spring acting on the diaphragm valve to normally seat the valve. The lower portion of the valve body carries the valve actuator which lifts the valve against the spring load. If the outlet portion is struck hard enough, the groove in the body just below the valve seat will break, which allows the outlet and actuator to fall away whereupon the spring closes the valve. This prevents accidental loss of the contents of the tank truck. The spring chamber is vented. The parts exposed to the contents are readily cleaned in place.
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