韩国AUTOMA电气动执行器，电动球阀，电动蝶阀，气动球阀，气动蝶阀，限位开关等。韩国三洋SAMYANG三合一止回阀，  阀，疏水阀，水用减压阀，蒸汽减压阀，扩散过滤器，溢流阀等；由厂家直接供货，价格优惠，质量保证。欢迎来电。电话：010-51767982、13911661164，联系人：丁建辉。
 
Difference size depending on actuator torque, and knob on hand wheel for easy operation 
  
 
Precisely machined double worm gear c/w minimum back-lash, low noise, high output torque 
  
 
Proviede by double worm gearing to keep position of valve unchanged against reverse torque from valve