球阀分单作用和双作用两种型号。
气动活塞式执行机构可分为单作用和双作用两种。
Pneumatic piston actuators can be divided into single and double acting two.
大口径阀门采用系列aw型气动执行器拔叉式传动，结构合理，输出扭矩大，有双作用式和单作用式。
AW series of large diameter valves using pneumatic actuator fork-type transmission, reasonable structure, output torque, a double-acting and single acting.
气体管道增压泵有单作用泵和双作用泵。
Gas pipelines have a single role of booster pumps and pump dual role.
气体管道增压泵有单作用泵和双作用泵。
Gas pipelines have a single role of booster pumps and pump dual role.
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