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。
Small craft - seacocks and through - hull fittings - part 1 : metallic iso 9093 - 1 : 1994 ; german version en iso 9093 - 1 : 1997 小型船舶.船底阀和船体外壳管接头.第1部分:金属件
Tanks for transport of dangerous goods - service equipment for tanks - pressure balanced footvalve ; german version en 13316 : 2002 危险物品运输槽罐车.槽罐车辅助设备.压力平衡底阀
Tanks for transport of dangerous goods - service equipment for tanks - non pressure balanced footvalve ; german version en 13308 : 2002 危险物品运输槽罐车.槽罐车辅助设备.无压平衡底阀
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。
Offers valves , fittings , tubing , reactors , intensifiers , gas boosters , pressure vessels and pumping systems for elevated pressure applications -生产楔式闸阀，平板闸阀，球阀，截止阀，止回阀，底阀，旋塞阀，蝶阀等各种类型。
Gravity ball check valves are converted to foot valves by replacing the union nut and end connector on the receiving end ? seat end ? of the body with an f . v . screen housing assembly 重力球形止回阀可以变为底阀，只需在接受端口-阀体的阀座端口，用一个f . v .滤网壳组件更换管接头螺母和端口连接件即可。
