1·The reverse flow, from developed to developing countries, is on the rise, too.
从发达国家到发展中国家的反向流动也在增加。
2·Requirement: Valve must be tight against reverse flow.
要求：这种阀门对于回流必须密封紧密。
3·The reverse flow region is observable near the pipe wall.
管壁附近存在明显的回流再附区；
4·Use a check valve to prevent reverse flow into the cylinder.
采用止回阀，防止回流入钢瓶。
5·Purpose: To test valve No. 1 for tightness against reverse flow.
目的：检测1号止回阀对于回流的密封性。
6·Purpose: To test check valve No. 2 for tightness against reverse flow.
目的：检测止回阀2号对于回流的密封性。
7·Precision machined tilting disc and seat for tight shutoff in reverse flow direction.
精密机加工的倾斜式阀瓣和阀座，适用于逆流的紧密关闭。
8·Requirements: Valve must be tight against reverse flow under all pressure differentials.
要求：在所有压差下，阀门对于回流必须是密封的。
9·The check valve plays an important role to prevent the reverse flow in high pressure system.
止回阀在高压系统中起着关键的防逆流作用。
10·Annular reverse flow zone can be found too in the combustor with the flat-straight slag baffle.
简单环形挡渣板也能产生环形回流区，在旋风燃烧室设计中可取代锥形缩口挡渣板。