Swagelok RS20 User manual

RS(H)20, 25
USER MANUAL
Read the complete manual before installing and using the regulator.

WARNING
Before removing a regulator from the system for service, you must
depressurize system
purge the system to remove any residual system media left in the regulator.
CONTENTS
Introduction................................................................................................................................................ 3
Installation ................................................................................................................................................. 4
Operation ................................................................................................................................................... 5
Maintenance .............................................................................................................................................. 6
Testing ....................................................................................................................................................... 6
Troubleshooting ........................................................................................................................................ 7
2

Introduction
Representative drawing of a standard RS20
1 body 13 valve spring 24 springguide
2 springhousing assembly 14 conical spring 25
3 bodyplug 15 26 set spring
5 valve assembly 16 diaphragm 27 setscrew
7 bodyplate 18 28 nut
8 diaphragm plate 19 29 socket head cap screw
9 bottom springguide 20 o-ring 30 ring
10 seat 21 o-ring
11 22
12 retaining ring 23 ball
3

Installation
WARNING
When installing a Swagelok self-venting regulator, position the vent connection or line away from
operating personnel. Operating personnel must protect themselves from exposure to system
fluids.
CAUTION
Do not use the regulators as a shutoff device
The preferred mounting position of the regulator is horizontal with the spring housing facing upwards.
The standard connection of the RS(H)20 is 1" bspp parallel female. To get a proper sealing across the
thread, Swagelok recommends using bonded seal rings.
If earthing is required, connect an earth wire under a spring housing bolt.
4

Operation
Note: All handle directions are when viewed from above.
Outlet and control pressure settings are obtained by adjusting the set screw with a 19 mm open end
wrench.
To increase the outlet or control pressure, rotate the set screw clockwise.
To decrease the outlet or control pressure, rotate the set screw counter-clockwise and vent the
downstream side of the regulator.
Make the final setting in the direction of increasing pressure to obtain the most accurate set
points.
Once fluid is flowing through the system, fine tuning may be required.
Icing of the regulator at high flow rates or high pressure drops may occur if the gaseous media or
atmosphere contains moisture.
An auxiliary upstream filter is recommended for use in all but the cleanest of media.
Installation of a downstream pressure relief is recommended for regulator and system protection.
If the shut-off valve at the outlet side is closed after changing the set pressure, the outlet pressure will
rise a little because of the closing force required for bubble-tight closing of the regulator.
This phenomenon is usually referred to as the “lock-up” and does not indicate a problem with
the regulator.
A decrease in the flow will result in a rise of the outlet pressure.
An increase in the flow will result in a fall of the outlet pressure and is usually referred to as the
“droop”.
This phenomenon does not indicate a problem with the regulator.
A decrease of the inlet pressure will result in a rise of the outlet pressure.
An increase of the inlet pressure will result in a fall of the outlet pressure.
This phenomenon is usually referred to as the “dependency” or “supply pressure effect” and
does not indicate a problem with the regulator.
CAUTION
When using the RSH(F)20, 25 with an inlet pressure higher than 200 bar, a safety valve must be
installed in the outlet line, because the outlet pressure may not exceed 200 bar.
5

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.

7
Troubleshooting
Problem: The outlet pressure creeps up, without turning the set screw.
Cause: A damaged valve and/or seat.
Solution: Replace the valve and/or the seat.
Problem: Leakage around the bodyplug.
Cause: A damaged o-ring or insufficient torque on the bodyplug.
Solution: Replace the o-ring or tighten the bodyplug according to the torque specifications.
Problem: Leakage between the body and the spring housing or through the relief hole at the side of the
spring housing.
Cause: A damaged diaphragm/piston o-ring or insufficient torque on the bolts.
Solution: Replace the diaphragm/piston o-ring or tighten the bolts according to the torque specifications.
Problem: Controlled pressure drops off sharply even when the flow is within regulator capabilities.
Cause: The system filter element is clogged.
Solution: Replace the system filter element.
Problem: The required outlet pressure can not be reached.
Cause: The inlet pressure is not high enough.
Solution: Make sure that the inlet pressure is sufficient.
Problem: The outlet pressure rises too much when going from a dynamic to a static situation.
Cause: There is too much flow in the dynamic situation.
Solution: A larger regulator is required.
Check the specific application data with the flow curves in our documentation, if available.
Problem: The outlet pressure does not drop if the set screw is turned counterclockwise.
Cause: The regulator is non-venting.
Solution: A shut-off valve in the outlet line must be opened to reduce the outlet pressure.
Problem: The outlet pressure has changed without turning the set screw.
Cause: Changes to the inlet pressure will result in changes to the outlet pressure.
A decrease of the inlet pressure will result in a rise of the outlet pressure.
An increase of the inlet pressure will result in a fall of the outlet pressure.
Solution: Maintain a constant inlet pressure to the regulator. See section “operation” about dependency.

Warranty Information
Swagelok products are backed by The Swagelok Limited Lifetime Warranty.
For a copy, visit swagelok.com or contact your authorized Swagelok representative.
For additional information, see www.swagelok.com. Swagelok, Snoop®– Swagelok Company
© 2010, 2011 Swagelok Company
January 2011, R1
MS-CRD-0189
Caution: Do not mix or interchange parts
with those of other manufacturers.