| 摘要 |
<p>In a non-drip valve for a fluid-flow line having a supply chamber, a discharge chamber and a vacuum chamber connected to the discharge chamber to withdraw fluid therefrom when the forward flow is arrested, pressure-responsive valve means controlling the forward flow from the supply chamber to the discharge chamber, and relief valve means to permit reverse flow bypassing said pressure-responsive valve when it is closed. Preferably a selectively-operable valve is provided to put said pressure-responsive valve in working condition.</p> |
