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Spirax Sarco
Control Unit
DP27
Spirax Sarco DP27 User Manual
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I
M
-
P470
-
0
3
CH Is
sue 7
27
5.8 H
o
w to ser
vic
e or renew t
he main valve and seat
DP
27
, DP
27E an
d DP
27
Y
Is
olate t
he re
duc
ing val
ve and zer
o the p
res
sure.
DP
27R
Is
olate t
he ac
tuat
ing ai
r supp
ly and z
ero t
he pre
ssu
re.
35.
Uns
crew t
he uni
ons a
nd re
leas
e the p
ipewo
rk
.
3
6
.
U
nscrew
the nuts.
36
37
35
35
26
28
Table of Contents
Table of Contents
1
Safety Information
3
Intended Use
3
Residual Hazards
5
General Product Information
6
General Description
6
Sizes and Pipe Connections
6
Pressure / Temperature Limits
8
Installation
10
Supply
10
Dp27E
11
Electrical Supply
11
Earth
11
Dp27R
11
Fitting
12
Recommended Installation
12
Pipeline Sizing
13
Pipeline Stresses
13
Isolating Valves
13
Removal of Condensate
13
Protection from Dirt
14
Pressure Sensing
14
Pressure Gauges
14
Continuous Duty
14
Safety Valve
15
Position in Relation to Other Control Valves
15
DP27 Position in Relation to Other Control Equipment
15
Commissioning
16
Setting Procedure
16
Two or more Valves in Parallel
17
Setting Procedure Sequence DP27, DP27E and DP27Y
17
Setting Procedure Sequence DP27R
17
Routine Maintenance
18
How to Renew the Pilot Filter Element
19
How to Renew or Change the Pressure Adjustment Spring
19
How to Renew the Pilot Valve Assembly
20
Handling Precautions for PTFE
20
Recommended Tightening Torques for Spring Housing/Actuating Chamber Cover Securing Studs and Nuts
21
How to Clean or Replace the Internal Strainer Screen
22
How to Renew the Pilot Valve Diaphragms
24
How to Renew or Clean Main Diaphragms
25
How to Service or Renew the Main Valve and Seat
27
Recommended Tightening Torques for Main Valve Seat
29
How to Service or Renew the Solenoid Valve
32
Coil Replacement
32
Spare Parts
33
Interchangeability of Spares
33
Fault Finding
36
Preliminary Procedure
36
Downstream Pressure Zero or too Low
36
Downstream Pressure too High
37
Hunting
37
4
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Spirax Sarco DP27 Specifications
General
Brand
Spirax Sarco
Model
DP27
Category
Control Unit
Language
English
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