Spirax Monnier SR3/SRN3 Compressed Air Regulators

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IM-P503-01
CH Issue 2
Spirax Monnier SR3 / SRN3
Compressed Air Regulator
Types:- SR3 - Self-relieving
SRN3 - Non-relieving
2
How to fit
The regulator should be sited as close as
possible to the equipment it is serving. Connect
regulator so that air flow is in the direction
shown by the arrow on the body. A pressure
gauge (supplied as an accessory, when
ordered) fitted to one of the gauge ports is
recommended (to show the secondary
pressure). A filter should be installed in front of
the regulator to keep dirt out.
1
5
To adjust
Loosen lock-nut 1. Turn adjustment spindle 2
clockwise to increase secondary pressure, or
anti-clockwise to decrease. Tighten lock-nut
(make sure in doing so you do not alter the
pressure setting). It is recommended that
adjustments are made under flow conditions there may be a slight increase in set pressure
when flow stops.
6
How does it work
With adjustment spindle 2 rotated fully
anti-clockwise, the valve return spring 3 will
keep the main valve 4 shut. Clockwise rotation
of the adjustment spindle will compress the
main pressure control spring 5, deflect the
diaphragm 6 downwards, opening the main
valve 4. As air flows to the downstream 7 side
of the regulator, the secondary pressure
increases. The secondary pressure is sensed
on the underside of the diaphragm. As the
controlled pressure varies, so does the force
on the underside of the diaphragm. When this
force (proportional to the secondary pressure)
equals the compression force in the main
control spring, the main valve will shut. Any fall
in secondary pressure will cause the main
valve to open sufficiently to meet the air flow
requirements and accurately maintain the set
secondary pressure.
IM-P503-01
Printed in theCH
UK Issue 2
4
7
3
Self-relieving regulators
Any appreciable rise in the secondary pressure
from its set value will cause the diaphragm to lift
clear of the valve spindle, the end of which
forms the self-relieving valve. This will allow air
to escape through the seat in the centre of the
main diaphragm to atmosphere. When excess
pressure has been vented the orifice in the
centre of the diaphragm will reseat.
© Copyright 19981
Non-relieving regulators
Are recommended for use with other gases,
such a nitrogen, carbon dioxide, etc.
Spare parts
SR3/SRN3 ¾" & 1"
AVAILABLE SPARE
Pressure Control Spring
J,L
Valve & Seat Assembly
B,A,C,G,E,O
Diaphragm Assembly
SR3 Relieving Type
F,G
Diaphragm Assembly
SRN3 Non-Relieving Type
F,G
Set of Spring Housing Bolts
N(6 off)
& Flow Diverter Bolts
M(2 off)
Gasket Set
(Pkt of 3 of each) E,O,G
130
L
N
J
How to order
1 - Valve and Seat Assembly for 1" SpiraxMonnier SR3
How to service
Shut off main air supply. Undo lock-nut and vent
system by unscrewing adjustment spindle until
there is no tension on the control spring. Remove
control spring housing. Unscrew valve retaining
plug and remove return spring and valve.
Remove deflector plate to gain access to valve
seat. Unscrew valve seat. Replace parts or
clean as necessary. Reassemble in reverse
order.
Assembly torque
Diverter Bolts (M)
Spring Housing Bolts(N)
Valve Seat (B)
Valve Plug (D)
6.5 Nm
6.5 Nm
30 Nm
30 Nm
F
G
M
B
O
Pressure
Gauge
Connection
A
C
E
D
2
IM-P503-01 CH Issue 2
Spirax-Monnier Products
General Safety, Installation and Maintenance Guidelines
WARNING
As with all Pressurised Systems, do NOT
attempt ANY Installation or Maintenance
function if there is ANY pressure in the
product or connected system.
Spirax-Monnier
Spirax Monnier compressed air products are
of well proven and simple design, with high
natural levels of designed safety built in.
However, used or installed incorrectly, their
performance and that of the system they are
protecting or controlling, may suffer. The
information given indicates the product limiting
conditions, maintenance and installation
requirements and any specific component
disposal needs.
Product Maintenance - See Over
Installation and Operation
1. Filters, Filter/Regulators, Lubricators, Flow
Meters, Separators and Drain Traps
should be fitted in horizontal pipelines, with
the bowls vertically downwards.
2. Regulators and Ball Valves can be installed
in any position.
3. On Pressure Regulators and combined
Filter/regulators, a Pressure Gauge can
be connected to one of the 1/8" ports.
The gauge should be selected to cover the
maximum pressure range of the main
Control Spring. The gauge will indicate the
downstream or controlled pressure.
4. Ensure that the Control Spring range for
Regulators and Filter/Regulators fully meets
the pressure requirements of the system.
IM-P503-01 CH Issue 2
5. There are Maximum Operating Pressures,
and Maximum Operating and Environmental
Temperatures for each product.
These are shown in the table below.
6. Adequate space should be provided around
any product to allow easy access for
routine servicing requirements.
7. Products fitted with a Bowl ( Polycarbonate
or Metal ) should be adequately drained manually or automatically - to reduce the
potentially harmful effects of water carryover.
8. WARNING Polycarbonate Bowls and Sight
Domes, and Sight Levels fitted to Metal
bowls, may be attacked by Phosphate
Ester based fluids, Solvents, Chemical
cleaners, Carbon Tetrachloride, etc.
These and other similar substances should
never be allow to come into contact with
these product components. Certain
compressor lubricating oils also contain
additives harmful to these components.
Where there is any doubt, we recommend,
in the interests of safety, that Bowl
Guards or Metal Bowls are fitted.
9. Local regulations may restrict the use of
this product below the conditions quoted.
10. For more detailed information on any
individual product, please ask for the
appropriate Technical Information Sheet
listed in the table.
For Maximum Pressures/Temperatures
see overleaf
3
MAXIMUM PRESSURES/TEMPERATURES
Polycarbonate Bowl
FILTERS
MF2
IF2/D/A
IC3/4/DA
IXI
SF3/A
bar
10
10
10
10
-
°C
50
50
50
50
-
Metal Bowl
bar
17
17
17
17
°C
80
80
70
80
Metal Bowl with DISPOSAL
Sight level
CLASS
TI
bar
°C
1&3
P050-05
17
70
1&2
P500-01
17
70
1&2
P501-01
17
70
1&2
P057-01
17
70
1&3
P050-03
REGULATORS
MR1/2/3 21 bar 70°C : CONTROL RANGES : 0.2/2. 0.3/4, 0.7/9 bar
IRI
20 bar 70°C : CONTROL RANGES : 0.2/3.5, 0.5/1 bar
SR2
21 bar 70°C : CONTROL RANGES : 1.3 - 17.0 bar
SR3
21 bar 70°C : CONTROL RANGES : 0.2/4, 0.3/9 bar
1&3
1&2
1&3
1&3
P051-01
P058-01
P570-01
P570-03
FILTER REGULATORS
IP2/A/D
10
70
1&2
P510-01
-
1&3
P054-01
-
1&3
P054-04
70
70
1&3
1&2
1&3
P052-07
P059-01
P052-04
-
1&2
1&3
P580-01
P050-17
-
1&4
1&3
P560-01
P050-07
MP2
MPC2
50
17
80
17
RANGES : 0.2/3.5, 0.5/10 bar
10
50
RANGES : 0.2/2.0, 0.3/4.0, 0.7/9.0 bar
10
50
RANGES : 0.2/2.0,.0.3/4.0, 0.7/9.0 bar
LUBRICATORS
ML3
10
IL1
10
SL3
-
50
50
-
17
17
80
80
17
17
OTHER PRODUCTS
IFM2
10
50
S.M.S.
17
70°C
BALL
all to 15 bar & 45°C
VALVES (all)
(see performance graph on TI for full details)
DRI-LINE
16
80°C
DISPOSAL
1. Some plastic and/or rubber components
2. Main body Zinc - epoxy coated
3. Main body Aluminium - epoxy coated
4. Brass and Steel
5. Electronic Components
Note
Customers are reminded that under UK and EC Health, Safety and Environmental Law, when
returning products to Spirax Sarco they must provide information on any hazards and the
precautions to be taken due to contamination residues or mechanical damage which may present
a health, safety or environmental risk. This information must be provided in writing including Health
and Safety data sheets relating to any substances identified as hazardous.
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IM-P503-01 CH Issue 2

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