Diaphragm valves installation and maintenance and fault elimination
Installation and Maintenance
1．Before installation, you should carefully check the pipe running conditions are whether in line with the valve specified applicable scope, and should clean cavity to prevent dirt jamming or damage of sealing components
2．Rubber lined layer and rubber diaphragm surface are avoid pringting greases to prevent the rubber swelling, and affecting valve service life
3．When Installation, you shall not fasten the wire on handwheel or stem to sling the valve
4．When manual operating valve, you shall not be by means of auxiliary level, to prevent excessive torque and damage driven components or sealing parts
5．Valves should be stored in dry and well ventilated room, is strictly prohibited stacking, both ends passages of inventory valve must be sealed, and hoist parts should be in slightly open state.
Fault and elimination
| Possible faults | reasons | eliminating methods |
| Handwheel operation is not flexible | 1． Stem bending 2． Thread damage | 1． replace the stem 2． repair thread and add lubricant |
| when pneumatic, the valve can not automatically open and close | 1． Air pressure is too low 2． Spring preload is too large 3． Rubber Diaphragm is damaged | 1． Increase gas supply pressure 2． Reduce spring preload 3． replace diaphragm |
| the joint of body and bonnet leaks | 1． Connecting bolt is loose 2． Body rubber Lined layer breaks | 1． fasten connecting bolt 2． replace body |
