| 摘要 |
<p>A valve for pressurized recipients comprises two separated chambers, in communication with pressurized liquid and pressurized gas respectively. An orifice in a clapper can be moved between the first chamber for distribution of product, the second chamber for purging by the issue of gas, and a closed position. A closure member movably mounted on the clapper can obturate the orifice to prevent purging during opening of the valve, while allowing purging during closing of the valve.</p> |
