double-acting piston

双向动作活塞,... ... ) double acting piston 双动活塞 ) double-acting piston 双作用活塞 ) piston-operated valve 活塞动作阀 ...

... ) piston-operated valve 活塞动作阀 ) double-acting piston 双向动作活塞 ) double acting piston 双作用活塞;双动活塞 ...