Maintenance

Possible Failures	Possible Causes	Solutions
Seal leakage	Foreign substance existing in sealing ring	Clean the sealing face.
Seal leakage	Sealing ring damaged	Replace the sealing ring or grind the sealing face.
Upper seal leakage	Upper seal packing loosened	Fasten the bolt on packing or gland.
Upper seal leakage	Upper seal packing out of work	Fill in oil or replace the upper seal packing.
Flange end face	Connecting bolt not evenly fastened.	Fasten the flange conne- cting bolt evenly.
Flange end face	Flange gasket out of work	Replace the flange gasket.
Valve open and close blocked	Drive unit not lubricated	Fill in lubrication oil to valve drive unit.
Valve open and close out of work	Drive unit damaged.	Replace the drive unit or have it repaired by a specialist.

Installation and Operation

1. Before installation, check whether the valve model can meet the service co-nditions.
2. For the soft seal like rubber or PTFE etc., check whether there is any foreignsubstance in valve cavity and sealing face. If any, have it cleaned.
3. Before installation, user shall take into consideration of the necessary space for the drive unit of valve.
4. The electric (electro-hydraulic) valve has already been commissioned before being delivered out of the factory. For the first time of use, to avoid false co-nnection, turn the valve to half opened with hand, and then, connect in power supply to carry out no-load test opening.
5. Pneumatic (hydraulic) valve shall be assured of enough pneumatic (hydraulic)pressure in the source of air supply.
6. Upon installation, all bolts shall be evenly fastened.
7. Upon installation, don’t  have sudden impact on valve or screw any parts on valve at random.
8. If the upper seal of valve is exposed, fill in sealing grease on a regular basis.
9. In the relatively dry area, if the drive unit of valve is spur gear, fill in lubrication oil on a regular basis.