MAINTENANCE
Series 642
52/73
Edition 2013-08-22
603685EA
7.2
Maintenance procedures
One maintenance procedures are defined for this valve:
Replacement of gate seal
(gate and bonnet seal)
and valve cleaning
Required frequency of cleaning and replacement of seals is depending on process
conditions.
VAT can give the following recommendations for preventive maintenance:
Replacement of
Recommendation
Gate seal
(gate and bonnet seal)
Every 100’000 cycles
For spare parts of gate and bonnet seal refer to chapter: «Spare parts»
7.2.1
Replacement of gate seals and valve cleaning
7.2.1.1
Required tools
Allen Wrench 4 mm (Allen torque wrench 4 mm)
2 × Open end wrench 13mm
Open end torque wrench 13 mm
Clean room wiper
Isopropyl alcohol
Vacuum grease (see chapter spare parts)
O-ring removal tool
(see chapter Accessories)
Description
Required tool
1. Vent both valve chambers
2. Open the valve
3. Turn off power to valve controller
4. Disable power-fail option (wait 60
seconds)
CPA or Service Box 2
5. Disconnect power cable at controller
