Single acting, single rod, spring return.

单作用，单杆，弹簧复位。

youdao

VRP120 single acting pilot check valves lock a single acting cylinder.

VRP120型液控单向阀用于锁紧单作用液压缸。

youdao

AW series of large diameter valves using pneumatic actuator fork-type transmission, reasonable structure, output torque, a double-acting and single acting.

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。

youdao

Just to prove that his atoms really were acting as single waves, Dr Ketterle made two condensates at the same time, and allowed them to merge, thus creating ripple-like interference patterns of the sort that might be seen if two stones were thrown simultaneously into the same pond.

ECONOMIST: The 2001 Nobel prizes: Playing catch-up | The

Each throng seems to be governed by a group mind and appears to be acting as a single organism, so quickly do they shift direction and flow into new shapes.

ENGADGET: Editorial: Tech is a flock of starlings

"It requires a real vision and acceptance that this strategic partnership is the only alternative to a world in which we break up into different poles of power, acting as rivals to one another, with every single dispute in the world being played off against these different poles of power, " he said.

BBC: Blair-Putin tensions on sanctions