DP27T and DP27TE Pilot Operated Pressure / Temperature Control Valves with SG Iron Bodies

DP27T and DP27TE Pilot Operated Pressure / Temperature Control 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-P470-08
CH Issue 3
DP27T and DP27TE
Pilot Operated Pressure /
Temperature Control Valves with SG Iron Bodies
Description
The DP27T and DP27TE are combined pressure / temperature
control valves for use on steam applications. They are
designed to be used in conjunction with a 2 m length of
capillary which is available separately (other lengths are
available on request - see 'Optional extras', page 4). They
combine a temperature and pressure pilot valve in one unit.
This controls the main valve so that the temperature is
maintained while the maximum steam pressure is limited.
A variable rate conical pressure adjustment spring is fitted
providing a downstream pressure range of 0.2 - 17 bar g.
DP27T shown
Notes:
1. The valve can be supplied with a blank undrilled flange
if required.
2. The sensor of the control system will need to be mounted
by either a union kit, pocket or wall mounting bracket - see
'Optional extras, page 4'
Technical data
(Solenoid valve)
DP27T
Pressure / temperature control
Optional
Pressure / temperature control extras
with elec tr ic ally operated See page 4.
solenoid valve
DT27TE
230 ±10% Vac or 115
±10% Vac
(others available on
request).
Voltages
available
Available types of valve
Frequency
50/60 Hz
Inrush
Power
consumption Holding
45 VA
23 VA
Temperature ranges
Range A 16 °C to 49 °C
Range B 38 °C to 71 °C
Range C 49 °C to 82 °C
Range D 71 °C to 104 °C
Range E 93 °C to 127 °C
Sizes and pipe connections
DN15LC - Low Capacity version, DN15, DN20, DN25, DN32, DN40 and DN50 screwed BSP (BS 21 parallel) or NPT (DN15 to DN25 only).
DN15 - DN50 EN 1092 PN25
Standard flanges:
DN25 - DN50 BS 10 Table H and ANSI 300
Available on request: DN15 - DN50 JIS 10, JIS 16 and ANSI 150
DN15 - DN20 BS 10 Table F
DN15 ANSI 300
Temperature °C
Pressure / temperature limits
A
G
Steam
saturation
curve
Body design conditions
D
B
Maximum design pressure
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
G
C
Pressure bar g
E
The product must not be used in this region.
Screwed and flanged EN 1092 PN25, ANSI 300, and
A-D-E
BS 10 Table H.
A-B-C Flanged ANSI 150.
G-G
PN25
A-D-E
The DP27TE is limited to 10 bar g @ 190 °C.
Maximum upstream pressure
for saturated steam service
Maximum operating temperature
-10 °C
DP27T
DP27TE
17 bar g
10 bar g
DP27T
232 °C @ 17 bar g
DP27TE
190 °C @ 10 bar g
Minimum operating temperature
0 °C
Note: For lower operating temperatures consult Spirax Sarco
Maximum differential pressure
DP27T
17 bar
DP27TE
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 1 of 9
Materials
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 2056 302 S 25
6
Bottom spring plate
Securing nuts
7
Spring housing
BS 3692 Gr. 8.8
BS 3692 Gr. 8
DIN1693 GGG 40.3
Brass
BS 2872 CZ 122
Steel
BS 3692 Gr. 8
Steel
Securing studs
DN15 to DN32
M10 x 95 mm
DN40 and DN50
M12 x 95 mm
BS 4439 Gr. 8.8
8
Pilot diaphragms
Phosphor bronze
9
Pilot valve chamber
SG iron
10
Pilot valve plunger
Stainless steel
BS 970 431 S 29
11
Pilot valve seat with integral seal
Stainless steel + PTFE
BS 970 431 S 29
12
Pilot valve ball
Stainless steel
AISI 420
13
Pilot valve spring
Stainless steel
BS 2057 302 S 25
14
Pilot valve clip
Stainless steel
BS 1449 301 S 21
15
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
Main valve return spring
Stainless steel
BS 2056 302 S 25
19
Main valve
Stainless steel
BS 970 431 S 29
20
Main valve seat
Stainless steel
BS 970 431 S 29
21
Balance pipe assembly
Copper
BS 2871 C 106 ½H
22
Main valve body
SG iron
DIN 1693 GGG 40.3
Securing nuts
23
24
Main body
Securing studs
Main diaphragm chamber
Main diaphragm
DIN 1693 GGG 40.3
Steel
BS 3692 Gr. 8
Steel
DN15 to DN32
M10 x 25 mm
DN40 and DN50
M12 x 30 mm
SG iron
Securing nuts
25
BS 2870 PB102 1980
Securing studs
BS 4439 Gr. 8.8
DIN 1693 GGG 40.3
Steel
BS 3692 Gr. 8
Steel
BS 3692 Gr. 8.8
DN15 to DN32
M12 x 50 mm
DN40 and DN50
M12 x 55 mm
26
Main diaphragms
Phosphor bronze
BS 2870 PB 102
27
Main diaphragm plate
Brass
BS 2872 CZ 122
28
Pushrod
Stainless steel
BS 970 431 S 29
29
Control pipe assembly
Brass and copper
30
Plug
32
Lock-nut
33
Solenoid valve
34
Packless gland housing
Brass
BS 2874 CZ 121
35
Pilot valve plunger
Phenolic resin
ISO (BS) PF2C3
36
Pilot valve seat ring
Stainless steel
BS 970 431 S 29
37
Pilot valve closure member
Stainless steel
AISI 440 B
38
Pilot valve housing
" BSP
Steel
Steel
SG iron
Securing nuts
39
Pilot valve housing
BS 3692 Gr. 8
Securing studs
DIN 1693 GGG 40.3
Steel
BS 3692 Gr. 8
Steel
DN15 to DN50
M10 x 25 mm
BS 4439 Gr. 8.8
40
Locking ring
Brass
BS 2874 CZ 122
41
Adjustment head
Phenolic resin
ISO (BS) PF2C3
42
Adjustment head securing screws
Cadium plated
2 BA x ¾"
43
Capillary tube
Copper PVC covered
44
Sensor
Brass
Page 2 of 9
EN 12451 CW707R H130/170
TI-P470-08 CH Issue 3
DP27T and DP27TE Pilot Operated Pressure / Temperature Control Valves with SG Iron Bodies
9
15
16
17
Please note that the pilot valve chamber (9) has
been shown out of position to identify items 15, 16
and 17.
DP27T
1
6
Exploded view of item 11
2
43
3
10
4
45
5
40
41
35
46
7
47
42
48
8
11
12
9
13
21
34
39
37
38
36
44
18
14
29
19
20
22
28
24
23
32
25
26
DP27TE
27
30
33
Materials - DP27T/TE
See DP27 items list on page 2 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
TI-P470-08 CH Issue 3
Turcon T40 / AQISI 302
BS 970 431 S 29
Page 3 of 9
DP27T and DP27TE Pilot Operated Pressure / Temperature Control Valves with SG Iron Bodies
Optional extras
Capillary tubes: Available in multiples of 2 m up to a maximum of 14 m.
Conversion kit: Comprising of a solenoid valve and the necessary pipe and fittings for converting an existing DP27T to DP27TE.
Union kit: Comprising of union nipple (U), compression ring (V) and a gland nut (W). The union nipple is screwed ¾" BSP.
Pockets: Are available in copper with brass union nipple, mild steel or stainless steel. Union nipple U forms the top of the pocket and
carries compression ring V and gland nut W. The union nipple is screwed ¾" BSP.
Special long pockets are available having minimum length of 0.5 m and a maximum of 1 m. They are sealed at the top by a rubber bung.
Glass pockets are also available complete with bracket and sealed by a rubber bung.
Wall mounting bracket: inclusive of cover.
Pressure sensing pipe
The DP27 controls by sensing the downstream pressure through a pressure sensing pipe taken from the union (31) or through the internal
balance pipe (21) provided. Fitting is described in the Installation and Maintenance Instructions supplied with the valve.
DP27T
31 (not visible)

Union kit
Pocket
Glass pocket
W
V
21
U
Page 4 of 9
TI-P470-08 CH Issue 3
DP27T and DP27TE Pilot Operated Pressure / Temperature Control Valves with SG Iron Bodies
Dimensions / weights
(approximate) in mm and kg
Size
Flanged
Screwed BS 10 H
PN25
Weight
ANSI 300 BS 10 F ANSI 150 JIS 10/16
A
A1
A1
A1
A1
A1
A1
B
D
F
G
Screwed
Flanged
DN15LC
160
-
130
126.6
117
120.2
122
185
404
130
130
15.7
16.5
DN15
160
-
130
126.6
117
120.2
122
185
404
130
130
15.7
16.5
DN20
160
-
150
-
133
139.4
142
185
404
130
130
15.7
17.4
DN25
180
160
160
160.0
-
160.0
152
207
428
148
130
17.2
19.7
DN32
-
180
180
180.0
-
176.0
176
207
428
148
130
-
20.7
DN40
-
200
200
200.0
-
199.0
196
255
473
178
139
-
32.2
DN50
-
230
230
230.0
-
228.0
222
255
473
178
139
-
35.2
A
A1
D
G
F
B
Union
kit
Metal
pocket
Glass
pocket
W
Wall
mounting
V
K
O
M
L
N
Union kit
P
Metal pocket
Wall mounting
Glass pocket
K
L
M
N
O
P
V
W
142
17.5
150
22.3
195
35
575
117
TI-P470-08 CH Issue 3
Page 5 of 9
DP27T and DP27TE Pilot Operated Pressure / Temperature Control Valves with SG Iron Bodies
Steam capacities chart
Downstream pressure bar
Upstream pressure bar
DN15LC
Capacity kg / h
DN15
DN20
DN25
DN32
DN40
DN50
DN80
Note
The capacities quoted above are based on valves fitted with an external pressure sensing pipe. Reliance on the internal balance 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 6 of 9
TI-P470-08 CH Issue 3
DP27T and DP27TE Pilot Operated Pressure / Temperature Control Valves with SG Iron Bodies
Compressed air capacities chart
Downstream pressure bar
Upstream pressure bar
Capacity dm3/s free air
DN20
DN25
DN15LC
DN15
DN32
DN40
DN50
DN80
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-P470-09) supplied with the product.
Installation note:
The valve should be installed in a horizontal pipeline with the direction of flow as indicated by the arrow on the valve body.
How to order
Example: 1 off Spirax Sarco DN20 DP27T pilot operated pressure/temperature control valve having flanged EN 1092 PN25 connections
and a temperature range A.
TI-P470-08 CH Issue 3
Page 7 of 9
DP27T and DP27TE Pilot Operated Pressure / Temperature Control 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 diaphragms
(2 off)
B
Pilot valve assembly
C, C1
Pilot valve filter and gasket
(packet of 3 of each)
E, F
Pilot valve assembly for temperature control unit
B2, C2, D2, E2
Pilot valve packless gland set
H2, J2
Main valve assembly
DN15 to DN50
K, L
Pushrod and main diaphragm plate assembly
G
Internal strainer
M
Main valve return spring
N
Pressure adjustment spring
0.2 - 17 bar
O
Control head (3 pieces)
Y, Z
When ordering state range and length of capillary tube. Normally stocked in capillary lengths of 2 m.
Available in multiples of 2 m up to a maximum of 14 m (at extra cost).
Range A 16 °C − 49 °C Range B 28 °C − 71 °C Range C 49 °C − 82 °C Range D 71 °C − 104 °C Range E 93 °C − 127 °C
Union sub assembly (3 pieces)
U
Control pipe assembly
P
Balance pipe assembly
Q
Body gasket set
(3 off)
R
Pilot valve block gasket temperature control unit (3 pieces)
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
DN15 to DN32 (set of 10)
Set of diaphragm securing bolts and nuts
Valve sizes:
V
DN40 to DN50 (set of 12)
Set of temperature pilot valve housing securing studs and nuts
(set of 4)
S1
Set of adjustment head securing screws
(set of 3)
Y
Solenoid valve complete
W
Type DP27TE only
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 the pilot
operated pressure / temperature control valve.
Example: 1 - Main valve assembly for a Spirax Sarco DN15 Type DP27T pilot operated pressure/temperature control valve.
How to fit: See the Installation and Maintenance Instructions supplied with the product. 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. Spares which are marked † are interchangeable with the DP17 and DP27 pressure reducing
valves. Spares marked 'o' are interchangeable with the 37D temperature control valve.
†o
†
†
o
o
†o
†o
†o
†
o
o
†
†
†
†o
†o
o
Size DN
Maintenance kit
Main diaphragm
Pilot diaphragm
Pilot valve assembly for pressure control unit
Pilot valve filter and gasket
Pilot valve assembly for temperature control unit
Pilot valve packless gland set
Main valve assembly
Internal strainer
Main valve return spring
Pressure adjustment spring
Control head
'O' ring for sensor bulb adaptor
Control pipe assembly
Balance pipe assembly
Gasket set
Pilot valve block gasket
Set of spring housing securing studs and nuts
Set of main body studs and nuts
Set of diaphragm securing bolts and nuts
Set of temperature pilot valve housing
securing studs and nuts
Set of adjustment head securing screws
Page 8 of 9
½"LC
a
a
a
a
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
a
a
a
a
a
a
a
a
1"
b
b
a
a
a
a
a
d
b
b
a
a
a
b
b
a
a
a
a
a
15LC
f
a
a
a
a
a
a
a
f
a
a
a
a
f
f
a
a
a
a
a
15
f
a
a
a
a
a
a
b
f
a
a
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
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
b
b
a
a
a
a
a
a
b
d
b
c
a
a
a
a
a
a
a
a
a
a
a
a
a
a
40
d
c
a
a
a
a
a
f
d
c
a
a
a
e
d
b
a
b
b
b
50
e
c
a
a
a
a
a
g
e
c
a
a
a
f
e
b
a
b
b
b
a
a
a
a
TI-P470-08 CH Issue 3
DP27T and DP27TE Pilot Operated Pressure / Temperature Control Valves with SG Iron Bodies
Pilot valve
packless gland set
Z
O
H2
J2
E2
S
D2
C2
Y
S
Q
S1
U
B
Shown 180° out of
position for clarity
Pilot valve chamber
assembly
B2
C1
F E
R
C
R1
N
R
K
T
L
V
Coil
X1
M
W
Core
assembly
G
X2
A
Solenoid valve complete
Main valve assembly
P
V
TI-P470-08 CH Issue 3
Page 9 of 9
DP27T and DP27TE Pilot Operated Pressure / Temperature Control Valves with SG Iron Bodies
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