DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies

DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
Local regulations may restrict the use of this product to below the conditions quoted.
In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2016
TI-P470-01
CH Issue 9
DP27, DP27E, DP27G, DP27GY,
DP27R and DP27Y Pilot Operated
Pressure Reducing Valves with SG Iron Bodies
Description
DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y pilot operated pressure reducing valves have bodies manufactured using SG iron.
These products are not suitable for oxygen service.
DP27
Suitable for steam or compressed air applications.
DP27E
Suitable for steam applications. It incorporates an electrical solenoid valve in the pipe assembly allowing
remote closure by means of a switching or timer device.
DP27G
Suitable for compressed air and inert industrial gas applications. Its design incorporates a nitrile soft seal
pilot and main valve. Note: it is not available with a solenoid valve.
Available types
DP27GY
Suitable for compressed air, inert industrial gas and critical low pressure control applications. Its design
incorporates a nitrile soft seal pilot and main valve, and uses a lower rate control spring with a downstream
pressure range of 0.2 - 3.0 bar. Note: it is not available with a solenoid valve.
DP27R
This can be remotely adjusted by varying a pressure signal to the pilot diaphragm. This is usually achieved
using a Spirax-Monnier pressure regulator and an instrument air supply.
DP27Y
Suitable for steriliser or critical low pressure control applications. It uses a lower rate control spring with a
downstream pressure range of 0.2 - 3.0 bar.
Standards
This product fully complies with the requirements of the European Pressure Equipment Directive 97 / 23 / EC and carries the
mark
when so required.
Certification
This product is available with a manufacturer's Typical Test Report.
Note: All certification / inspection requirements must be stated at
the time of order placement.
Sizes and pipe connections
DN15LC - Low Capacity version (not available for DP27G or DP27GY)
DN15, DN20, DN25, DN32, DN40 and DN50
Screwed BSP (BS 21 parallel) or NPT (DN15 to DN25 only).
Standard flanges: DN15 - DN50 EN 1092 PN16 and PN25
DN25 - DN50 BS 10 Table H and ASME 300
Flanges available on request:
DN15 - DN50 JIS 10/16 and ASME 150
DN15 - DN20 BS 10 Table F
DN15 ASME 300
DP27 shown
Page 1 of 11
Pressure / temperature limits
A
G
F
D
B
F
Steam
saturation
curve
G
DP27G and DP27GY
C
Pressure bar g
E
Temperature °C
Temperature °C
DP27, DP27E, DP27R and DP27Y
F
F
E
Pressure bar g
The product must not be used in this region.
A-D-E Screwed and flanged EN 1092 PN25, ASME 300 and BS 10 Table H
A-B-C Flanged ASME 150.
F-F-E The DP27G and DP27GY are limited to 120 °C.
G-G
The DP27E is limited to 10 bar g @ 190 °C.
Note: A variable rate conical pressure adjustment spring is fitted providing a downstream pressure range of 0.2 - 17 bar g. For the DP27Y
downstream pressure range is 0.2 - 3 bar g.
Body design conditions
Maximum design pressure
PN25
A-D-E
25 bar g @ 120 °C
A-B-C
17.2 bar g @ 40 °C
Maximum design temperature
232 °C @ 21 bar g
Minimum design temperature
Maximum upstream pressure for saturated steam service
For ASME 150, see A-B-C above
Maximum operating temperature
For ASME 150, see A-B-C above
-10 °C
DP27, DP27R and DP27Y
17 bar g
DP27G and DP27GY
25 bar g
DP27E
10 bar g
DP27, DP27Y
232 °C @ 21 bar g
DP27E
190 °C @ 10 bar g
DP27G, DP27GY
120 °C @ 25 bar g
Minimum operating temperature
Note: For lower operating temperatures consult Spirax Sarco
0 °C
DP27, DP27R and DP27Y
Maximum differential pressure
DP27G and DP27GY
DP27E
17 bar
25 bar g
10 bar
Designed for a maximum cold hydraulic test pressure of :
38 bar g
Note: With internals fitted, test pressure must not exceed :
25 bar g
Page 2 of 11
TI-P470-01 CH Issue 9
DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
Exploded view of
item 11
DP27 and DP27Y
1
*10
2
3
4
11
5
*12
*13
7
6
9
8
*14
11
15
16
17
19
18
19
* Note: Items 10, 12, 13 and 14 are shown on the
exploded view, as they are hidden by the pilot filter on
the main illustration.
Materials - DP27 and DP27Y (Parts 1 to 19)
No. Part
Material
1
Adjustment screw
Steel
2
Adjustment lock-nut
Steel
3
Spring housing
SG iron
4
Top spring plate
Stainless steel
ASTM A351/A351M CF8M
5
Pressure adjustment spring
Stainless steel
BS EN 10270-3:2001 302 S 26
6
Bottom spring plate
BS 3692 Gr. 8.8
BS 3692 Gr. 8
DIN1693 GGG 40.3
Brass
Securing nuts
BS 2872 CZ 122
Steel
BS 3692 Gr. 8
Steel
BS 4439 Gr. 8.8
7
Spring housing
DN40 and DN50
M12 x 95 mm
8
Pilot diaphragms
Phosphor bronze
BS 2870 PB102 1980
9
Pilot valve chamber
SG iron
* 10
11
Pilot valve plunger
Stainless steel
BS 970 321 S 31
Pilot valve seat with integral seal
Stainless steel + PTFE
BS 970 431 S 29
* 12
* 13
Pilot valve ball
Stainless steel
AISI 420
Pilot valve spring
Stainless steel
BS 2057 302 S 26
* 14
15
Pilot valve clip
Stainless steel
BS EN 10088-2 1995 1.4310
Pilot filter cap gasket
Stainless steel
BS 1449 316 S 11
16
Pilot filter cap
Stainless steel
BS 970 431 S 29
17
Pilot filter element
Brass
18
Internal strainer
Stainless steel
19
Body gasket
Stainless steel reinforced exfoliated graphite
TI-P470-01 CH Issue 9
Securing studs
DN15 to DN32
M10 x 95 mm
EN JS 1025
ASTM A240 TP 304
Page 3 of 11
DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
DP27 and DP27Y
23
33
20
24
21
22
31
32
30
29
25
28
26
27
Materials - DP27 and DP27Y (Parts 20 to 34)
No. Part
Material
20 Main valve return spring
Stainless steel
BS 2056 302 S 26
21
Main valve
Stainless steel
BS 970 431 S 29
22 Main valve seat
Stainless steel
23 Balance pipe assembly
Copper
BS 2871 C 106 ½H
SG iron
DIN 1693 GGG 40.3
24 Main valve body
25 Main body
BS 970 431 S 29
Securing nuts
Steel
BS 3692 Gr. 8
Steel
BS 4439 Gr. 8.8
Securing studs
DN15 to DN32
M10 x 25 mm
DN40 and DN50
M12 x 30 mm
26 Main diaphragm chamber - upper
SG iron
DIN 1693 GGG 40.3
27 Main diaphragm chamber - lower
SG iron
DIN 1693 GGG 40.3
28 Main diaphragm
Securing nuts
Steel
BS 3692 Gr. 8
Steel
BS 3692 Gr. 8.8
Securing bolts
DN15 to DN32
M12 x 50 mm
DN40 and DN50
M12 x 55 mm
29 Main diaphragms
Phosphor bronze
BS 2870 PB 102 1980
30 Main diaphragm plate
Brass
BS 2872 CZ 122
31
Stainless steel
BS 970 431 S 29
Pushrod
32 Lock-nut
Steel
33 Control pipe assembly
34 Plug
"
Page 4 of 11
BS 3692 Gr. 8
Brass and copper
BSP
Steel
Note: This item is hidden from view
TI-P470-01 CH Issue 9
DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
Exploded view of item 43
10
DP27E
45
46
47
48
12
13
49
14
43
44
Materials - DP27E
See DP27 items list on pages 3 and 4 for common components
No. Part
Material
43 Pilot valve assembly with integral seal
44 Pipe assembly
Brass and copper
45 Circlip
Stainless steel
1.4116
46 Retainer
Stainless steel
BS 970 431 S 29
47
Composite elastomer / stainless steel
Variseal
48 Pilot seat
Stainless steel + PTFE
Turcon T40 / AQISI 302
BS 970 431 S 29
49 Solenoid assembly
TI-P470-01 CH Issue 9
Page 5 of 11
DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
Materials - DP27G and DP27GY
Materials - DP27R
No. Part
Material
No. Part
35
Pilot valve chamber
SG iron
36
Pilot valve assembly Brass / PTFE / Nitrile
37
Main valve assembly
See DP27 items list on pages 3 and 4 for common
components
See DP27 items list on pages 3 and 4 for common
components
DIN 1693 GGG 40.3
Stainless steel /
Nitrile
BS 970 431 S29
DP27G
1
Material
38
Actuating
chamber cover
SG iron
39
Actuating air
supply union
Brass
40
Diaphragm
spring
Stainless steel
41
Actuating
Stainless steel reinforced
BS 2815 Gr. A
chamber gasket exfoliated graphite
42
Spring plate
DIN 1693 GGG 40.3
BS 2056 Gr. 302 S26
Brass
2
BS 2872 CZ 122
DP27R
3
4
7
38
39
5
40
42
8, 41
9
33
7
6
33
8
35
36
18
19
15
16
17
23
11
19
18
20
20
37
22
31
23
21
22
31
24
24
19
19
32
25
28
32
25
28
30
26
30
26
27
27
29
29
Technical data (Solenoid valve)
Voltages available
220 / 240 ±10% Vac or 110 / 220 ±10% Vac (others available on request)
Frequency
50 / 60 Hz
Power consumption
Inrush 45 VA
Notes for DP17R only:
1. Maximum downstream reduced pressure 15 bar g.
Holding 23 VA
2. The control pressure signal to the pilot diaphragm must be approximately 0.7 bar above the required
reduced downstream pressure.
Kv values
The Kv maximum values shown below are full capacities and should be used for safety valve sizing purposes only.
DN15LC
DN15
DN20
DN25
DN32
DN40
DN50
1.0
2.8
5.5
8.1
12.0
17.0
28.0
For conversion: Cv (UK) = Kv x 0.963
Cv (US) = Kv x 1.156
Note: Where the internal balance pipe is used the valve capacity will be reduced.
Page 6 of 11
TI-P470-01 CH Issue 9
DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
Dimensions / weights (approximate) in mm and kg
DP27, DP27E and DP27Y
Screwed
Size
DN15LC
DN15
DN20
DN25
DN32
DN40
DN50
A
160
160
160
180
-
BS 10 H
A1
160
180
200
230
PN16/25
A1
130
130
150
160
180
200
230
Flanged
ASME 300 BS 10 F
A1
A1
126.6
117
126.6
117
133
160.0
180.0
200.0
230.0
-
Weight
ASME 150 JIS 10/16
A1
A1
120.2
122
120.2
122
139.4
142
160.0
152
176.0
176
199.0
196
228.0
222
B
185
185
185
207
207
255
255
D
406
406
406
430
430
475
475
E
276
276
276
282
282
297
297
F Screwed Flanged
130
13.2
14.0
130
13.2
14.0
130
13.2
14.9
148
14.2
17.2
148
18.2
178
30.2
178
32.2
DP27, DP27E and DP27Y
A
A1
DP27G and DP27GY
A
A1
DP27R
A
A1
E
E
E
D
D
D
F
F
F
B
B
B
DP27G and DP27GY
Screwed
Size
DN15
DN20
DN25
DN32
DN40
DN50
A
160
160
180
-
BS 10 H
A1
160
180
200
230
PN16/25
A1
130
150
160
180
200
230
Flanged
ASME 300 BS 10 F
A1
A1
126.6
117
133
160.0
180.0
200.0
230.0
-
ASME 150 JIS 10/16
A1
A1
120.2
122
139.4
142
160.0
152
176.0
176
199.0
196
228.0
222
Weight
BS 10 H
A1
160
180
200
230
PN16/25
A1
130
130
150
160
180
200
230
Flanged
ASME 300 BS 10 F
A1
A1
126.6
117
126.6
117
133
160.0
180.0
200.0
230.0
-
ASME 150 JIS 10/16
A1
A1
120.2
122
120.2
122
139.4
142
160.0
152
176.0
176
199.0
196
228.0
222
B
185
185
207
207
255
255
D
364
364
388
388
433
433
E
234
234
240
240
255
255
F Screwed Flanged
130
12.0
12.8
130
12.0
13.7
148
13.0
16.0
148
17.0
178
29.0
178
31.5
DP27R
Screwed
Size
DN15LC
DN15
DN20
DN25
DN32
DN40
DN50
A
160
160
160
180
-
TI-P470-01 CH Issue 9
Weight
B
185
185
185
207
207
255
255
D
296
296
296
320
320
364
364
E
166
166
166
172
172
186
186
F Screwed Flanged
130
12.2
13.0
130
12.2
13.0
130
12.2
13.9
148
13.2
16.2
148
16.2
178
29.2
178
31.7
Page 7 of 11
DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
Steam capacities chart
Downstream pressure bar
*
Upstream pressure bar
Capacity kg / h
DN15LC
* Note:The DP27E
is limited to 10 bar.
DN15
DN20
DN25
DN32
DN40
DN50
Note
The capacities quoted above are based on valves fitted with an external pressure sensing pipe. Reliance on the internal pressure sensing
pipe will mean that capacities may be reduced. In the case of low downstream pressure this reduction could be up to 30% of the valve
capacity.
How to use the chart
Saturated steam
A valve is required to pass 600 kg/h reducing from 6 bar to 4 bar. Find the point at which the curved 6 bar upstream pressure line
crosses the horizontal 4 bar downstream pressure line. A perpendicular dropped from this point gives the capacities of all DP sizes
under these conditions. A DN32 valve, is the smallest size which will carry the required load.
Superheated steam
Because of the higher specific volume of superheated steam a correction factor must be applied to the figure obtained from the chart
above. For 55 °C of superheat the factor is 0.95 and for 100 °C of superheat the factor is 0.9.
Using the example given for saturated steam, the DN32 valve would pass 740 x 0.95 = 703 kg/h if the steam had 55 °C of superheat.
It is still big enough to pass the required load of 600 kg/h.
Page 8 of 11
TI-P470-01 CH Issue 9
DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
Compressed air capacities chart
Downstream pressure bar
Upstream pressure bar
Capacity dm3/s free air
DN15LC
DN15
DN20
DN25
DN32
DN40
DN50
How to use the chart
Capacities are given in cubic decimetres of free air per second (dm3/s). The use of the capacity chart can be best explained by an example.
Required, a valve to pass 100 dm3/s of free air reducing from 12 bar to 8 bar.
Find the point at which the curved 12 bar upstream pressure line crosses the horizontal 8 bar downstream pressure line. A perpendicular
dropped from this point shows that whereas a DN15LC valve will only pass 57 dm3/s and is therefore not large enough, a DN15 valve will
pass approximately 120 dm3/s under these conditions and is the correct valve size to choose.
Safety information, installation and maintenance
For full details see the Installation and Maintenance Instructions (IM-P100-05 for the DP27G and DP27GY, or IM-P470-03 for the DP27E,
DP27R and DP27Y) supplied with the product.
Installation note:
The pilot operated pressure reducing valve should be installed in a horizontal pipeline, protected by a strainer and a separator, with the
direction of flow as indicated by the arrow on the valve body.
How to order example:
1 off Spirax Sarco DN32 DP27 pilot operated pressure reducing valve having a 0.2 - 17 bar spring and flanged EN 1092 PN25 connections.
TI-P470-01 CH Issue 9
Page 9 of 11
DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
Spare parts
Available spares
Maintenance kit
A stand-by set of spares for general maintenance purposes and covers all spares marked*
* Main diaphragm
(2 off)
A
* Pilot diaphragm
(2 off)
B
C
* Pilot valve assembly inclusive of filter element (Pilot valve chamber assembly for the DP27G and DP27GY)
(packet of 3 off each)
E, F
* Pilot filter element and cap gasket
(Not required for the DP27G and DP27GY)
DP27G and DP27GY only - PTFE seals (packet of 6)
E
Main valve assembly
K, L
* Internal strainer
M
Main valve return spring
N
DP27, DP27E and DP27G
0.2 to 17 bar
O
Pressure adjustment spring (Not required for DP27R)
DP27Y and DP27GY
0.2 to 3 bar
* Control pipe assembly
P
* Balance pipe assembly
Q
* Body gasket (3 off)
R
Pilot valve block gasket (DP27R only)
R1
Set of spring housing / actuating chamber cover securing studs and nuts (set of 4)
S
Set of main body studs and nuts
(set of 4)
T
½" - DN32
(set of 10)
V
Set of diaphragm securing bolts and nuts
Valve sizes
DN40 and DN50
(set of 12)
Pushrod and main diaphragm plate assembly
Y
Type DP27E only
Solenoid valve complete
W
Replacement coil
X1
Valve seat and core assembly
X2
How to order spares
Always order spares by using the description given in the column headed 'Available spares' and state the size and type of pressure
reducing valve.
Example: 1 - Main valve assembly for a 1" Spirax Sarco Type DP27 pressure reducing valve.
How to fit. See Installation and Maintenance Instructions supplied with the pressure reducing valve. Further copies are available on
request.
Interchangeability of spares
The following table shows how in certain sizes some parts are interchangeable. For example in the line headed 'Main diaphragm' the
diaphragm used in the screwed valves ½" and ¾" is common to these sizes by the letter 'a', the letter 'c' indicates that one diaphragm is
common to the DN40 and DN50 valves. All spares are interchangeable with the DP27T and where marked † are interchangeable with
the 37D temperature control.**
** Note: This does not apply to the DP27G and DP27GY soft seat pilot valve or main valve assemblies.
Size DN
Maintenance kit
Main diaphragm
† Pilot diaphragms
Pilot valve chamber assembly
Pilot filter element
Pilot filter cap gaskets
PTFE seals
† Main valve assembly
† Internal strainer
† Main valve return spring
Pressure adjustment spring
† Control pipe assembly
Balance pipe assembly
† Body gasket
Set of spring housing securing studs and nuts
† Set of main body studs and nuts
† Set of diaphragm securing bolts and nuts
Pushrod and main diaphragm plate assembly
½"LC
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
Screwed
½"
¾"
a
a
a
a
a
a
a
a
a
a
a
a
a
a
b
c
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
1"
b
b
a
a
a
a
a
d
b
a
a
b
b
a
a
a
a
b
15LC
f
a
a
a
a
a
a
a
f
a
a
f
f
a
a
a
a
a
15
f
a
a
a
a
a
a
b
f
a
a
f
f
a
a
a
a
a
20
a
a
a
a
a
a
a
c
a
a
a
a
a
a
a
a
a
a
Flanged
25
32
b
c
b
b
a
a
a
a
a
a
a
a
a
a
d
e
b
c
a
a
a
a
b
c
b
c
a
a
a
a
a
a
a
a
b
b
40
d
c
a
b
a
a
a
f
d
c
a
d
d
b
b
b
b
c
50
e
c
a
b
a
a
a
g
e
c
a
e
e
b
b
b
b
c
Not available for the DP27G or the DP27GY
Page 10 of 11
TI-P470-01 CH Issue 9
DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
DP27, DP27G, DP27GY, DP27Y
S
S
DP27E
R1
DP27R
O
W
Solenoid valve complete
X1
DP27E
B
DP27G, DP27GY
C
X2
C
E
P
C
F
E
S
Main valve assembly
R
Q
N
R
K
L
V
T
T
M
A
Y
V
TI-P470-01 CH Issue 9
Page 11 of 11
DP27, DP27E, DP27G, DP27GY, DP27R and DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
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