6
Maintenance
Required tools for maintenance
a vice to fasten the regulator
pincers to take out the o-rings
a pair of tongs for a retaining ring 70 mm (RS20)
a torque wrench
a torque wrench hexagon head key 10 mm
a torque wrench “open end insert tool”, 46 mm
an open end wrench, 18 mm
media and temperature compatible lubricant for reassembling threaded parts
media and temperature compatible lubricant for o-rings
▪Snoop®liquid leak detector
Disassembly instructions
Loosen the hexagon socket head screws and remove the spring housing, set spring, bottom
springguide.
For diaphragm sensing versions the diaphragm and diaphragm plate can be removed.
For piston sensing versions, the piston plate and the piston can be removed.
Loosen the bodyplug and remove the valve, valve spring and seat.
Inspection of disassembled parts
Check all parts for abnormal wear. Replace parts in case of doubt.
Points of attention before assembly
All parts must be clean and undamaged before starting assembly.
Swagelok recommends replacing all o-rings and the diaphragm before assembly.
All threaded parts must be lightly lubricated before assembly, this to avoid galling of threads.
All o-rings need to be lightly lubricated to improve the lifetime of the o-ring and the performance of the
regulator.
Assembly instructions
Follow the points for disassembly in reverse order to assemble the regulator.
Recommended torques
▪Hexagon socket head screws M12 80 N·m (707 in. ·lb)
▪Bodyplug 50 N·m (442 in. ·lb)
Testing
Check the regulator for leakage across the seat, with low- and high inlet pressure.
Check the regulator for leakage across the diaphragm/piston, with low- and high outlet pressure.
Check the required outlet pressure range.
A well performing RS(H)20, 25 is 100% bubble tight.
If there is a leakage across the seat or the diaphragm/piston, the damaged parts must be replaced.
