免费精品无码av片在线观看,国产老熟女老女人老人,小雪的13又嫩又紧又多水,无人在线观看完整免费版视频

  XZA/HBC series ,the combination of XZA series multi-turn electric actuators and HBC worm speed reducer , was used to control ball valve ,butterfly valve and other part-turn valve actuators.This series actuators have features as firm constructure, multiple standard,large torque rang,stable output and self-locking ability.In order to gear into valve rod,HBC has a involute serration joint.It is easy to test and adjust.