| 摘要 |
A tulip-type check valve is housed in a cylindrical chamber, the length of which is greater than the check valve itself so that during the pressure stroke of the pump, the valve moves forward in its chamber and flexes to permit flow about its periphery. During the suction stroke, the valve closes and is drawn backward upstream in its chamber and there is a sucking back of liquid between the check valve and the orifice to obviate nozzle the drip.
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