Housing

Hard anodized Aluminum casting and external epoxy powder coated against severe industrial environment.  
 
 
Sealing

Sealed by O-ring in all interfaces, and double o-ring sealing for IP68(option)
 
 
Lubrication

EP type grease, maintenance free service for a long period time
 
 
Hand wheel 

Difference size depending on actuator torque, and knob on hand wheel for easy operation 
 
  
Gear

Precisely machined double worm gear c/w minimum back-lash, low noise, high output torque 
 
  
Self locking

Proviede by double worm gearing to keep position of valve unchanged against reverse torque from valve