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Spirax Sarco
Control Unit
DP27
Page 21 (Recommended Tightening Torques for Spring Housing;Actuating Chamber Cover Securing Studs and Nuts)
Spirax Sarco DP27 - Recommended Tightening Torques for Spring Housing;Actuating Chamber Cover Securing Studs and Nuts
40 pages
Manual
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I
M
-
P470
-
0
3
CH Is
sue 7
21
Ta
b
l
e
1
Recommend
ed tightening torques for s
pr
ing
housing/actuat
ing
chamber cov
er securing studs
and nuts
Si
ze o
f val
ve
Nut
size
Tightening torques
DN
1
5, DN20,
DN25
and DN3
2
M10
40 - 5
0 N m
DN40 and
DN50
M12
4
5 - 55 N m
12
7
10
11
8
20
22
Table of Contents
Main Page
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
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