bottom valve meaning in English

底阀

Bottom valve with double opens
双门底阀
Design and application of forcing air discharge device for water drainage of mine pump without bottom valve
矿山水泵无底阀排水压风排空气装置的设计和使用
There is no need of bottom valve in pipeline , only to ensure certain priming oil in pump body before work
管路中不需底阀，工作前只需保证泵体内储有定量引油即可。
Technical requirement for repairing special equipment of trailing hopper suction dredgers part 4 : conical bottom valve
耙吸挖泥船专用设备修理技术要求第4部分：斜盘式泥门
Aduanced multiple - type bottom valve system structure , guarantee multiple damping forces realized and match the suspension system better
先进的多型式活塞底阀系结构，保证多级阻尼力实现，更好匹配悬挂系统。