Pilot Operated Back Pressure Regulator 1/2" to 4" 25BP

Pilot Operated Back Pressure Regulator 1/2" to 4" 25BP
Pilot Operated Back Pressure Regulator
1/2" to 4" 25BP
Typical Applications
The 25BP Back Pressure
Regulator maintains a constant
Model
25BP
upstream pressure in a piping
system. The reverse-acting Sizes
½" to 2"
2½", 3", 4"
½" to 2" 2", 2½", 3", 4"
pressure pilot opens the
NPT ANSI 125 flgd.
NPT
ANSI 300 flgd.
main valve when the sensed Connections
upstream pressure increases. Cast Iron Cast Steel
The 25BP is NOT a safety valve, Construction
and should NEVER be used as Options
ANSI 250 flgd.
ANSI 150 flgd.
such.
The modulated release of surplus steam
ensures that the set maximum presure in
the steam space or upstream piping will
not be exceeded. Flash steam recovery
systems to release excess flash steam
limits the flash tank pressure. For
elimination of non-critical loads, see
TI-3-031-US.
(excludes 2")
A
Limiting Operating Conditions
Max. Operating NPT:
Pressure(PMO) ANSI
ANSI
ANSI
ANSI
250 psig (17 barg)
125: 125 psig ( 8 barg)
250: 250 psig (17 barg)
150: 185 psig (12 barg)
300: 300 psig (20 barg)
@ 450˚F (232˚C)
@ 450˚F (232˚C)
@ 450˚F (232˚C)
@ 450˚F (232˚C)
@ 450˚F (232˚C)
C
Max. Operating 450˚F (232˚C)
Temperature
¼" NPT Sensing
Line Connection
Upstream Pressure Ranges
E
For the following upstream pressures, three color-coded pilot valve
springs are available:
Yellow: 3 to 30 psi
Blue: 20 to 100 psi Red: 80 to 250 psi
D
Pressure Shell Design Conditions
PMA
Cast Iron: 250 psig/0-450˚F 17 barg/0-232˚C
Cast Steel: 300 psig/0-600˚F21 barg/0-316˚C
TMA
Cast Iron: 450˚F/0-250 psig 232˚C/0-17 barg
Cast Steel: 600˚F/0-300 psig316˚C/0-21 barg
Max. allowable pressure
B
Max. allowable temperature
Sample
Specification
The back pressure
regulator shall be of
the pilot-actuated,
diaphragm-operated
type. The main valve
shall be single seated with hardened
stainless steel trim;
the valve body shall
be cast iron (cast
steel). The pilot shall
be bolted directly to
the valve body.
A1
A
5.5
140
A1
–
–
A1
–
–
B
7.6
194
C
12.2
310
D
6.2
157
E
18.4
467
Cast Iron
32 lb
14.5 kg
1"
6.0
152
–
–
–
–
8.6
219
12.1
308
6.75
171
18.9
479
39 lb
17.7 kg
43 lb
19.5 kg
1¼", 1½"
7.25
184
–
–
–
–
8.6
219
12.7
322
7.1
179
19.75
502
44 lb
20 kg
48 lb
21.8 kg
8.5
216
–
–
9.0
228
10.6
270
13.3
338
8.2
208
21.5
546
69 lb 31.3 kg
75 lb
34 kg
2½"
–
_
10.9
276
11.5
292
13.6
346
14.0
356
13.9
354
27.9
710
157 lb
71.2 kg
171 lb
77.6 kg
3"
–
–
11.75
298
12.5
318
13.6
346
13.9
354
14.4
367
28.4
721
188 lb
85.3 kg
205 lb
93 kg
–
–
13.9
352
14.5
368
15.6
397
15.25
387
16.1
410
31.4
797
284 lb
129 kg
309 lb
140 kg
2"
D
Capacities:
For selection and
sizing data, see
TI-3-031-US.
B
2"* to 4"
(nominal) in inches and millimeters
Size ½", ¾" E
Dimensions
Ansi 125 Ansi 250
Ansi 300
C
½" to 2"
4"
Weight
Cast Steel
35 lb
15.9 kg
Local regulation may restrict the use of this product below the conditions quoted. Limiting conditions refer to standard connections only.
In the interests of development and improvement of the product, we reserve the right to change the specification.
TI-3-023-US 4.12
Pilot Operated Back Pressure Regulator
1/2" to 4" 25BP
43
43
44
44
48
48
46
45
45
46
53
50
49
48
51
52
3
60
2
11
13
7
1
4
5
6
53
49
46
50
47
52
60
51
3
9
8
10
12
11
13
47
25
1
5
14
25
28
25
28
27
19
15
21
22
20
18
19
21
22
23
24
20
26
2"* to 4"
1/2" to 2"
*ANSI 300 ONLY
Construction Materials
17
Diaphragm Plate Stem
18
Diaphragm Stem Guide
19Nut
20
Lower Diaphragm Case
21
Diaphragm Plate
22
Main Diaphragm (2 ply)
23Bushing
24
Tube & Orifice
25
Tubing Assembly
26
Plug (Cast Iron)
(Cast Steel)
Stainless Steel
Stainless Steel
Brass ½" - 2"
Steel 2"* - 4"
Cast Iron
Cast Steel
Brass ½" - 2"
C.I. 2"* - 4"
Stainless Steel
CRS
Brass
Copper
Brass
Steel
ASTM A 126 CL B
ASTM A216 Gr WCB
ASTM A 126 CL B
ASTM A216 Gr WCB
ASTM A449
400 Series Stn Stl
ASTM A 126 CL B
ASTM A216 Gr WCB
No. Part 27
Connector Stud
28
Body Gasket
43
Adjustment Screw
44
Jam Nut
45
Pilot Valve Spring
46
Upper Diaphragm Case
47
Lower Diaphragm Case
48
Spring Plate
49
Diaphragm
50
Diaphragm Plate
51 Head & Seat Assy.
52
Pilot Mounting Screws
53
Diaphragm Case Screws
60
Pilot Gasket
Material
Stainless Steel
½" - 2" Copper Clad
2"* - 4" Graphite
Stainless Steel
Brass
Steel
Cast Iron
Cast Steel
Cast Iron
Cast Steel
Steel
ASTM A569
Stainless Steel
Brass
Stainless Steel
Stainless Steel
Steel
ASTM A449
Steel
Graphite
Installation
ASTM A 126 CL B
ASTM A216 Gr WCB
The regulator should be installed in a horizontal line with suitable
bypass and isolating valves. A steam trap should be installed upstream
to prevent condensate from reaching the regulator. The trap and regulator should both be protected with a strainer. The pressure sensing
line should be located either in the upstream piping, or in the steam
space. Complete installation instructions are given in IM-3-023-US.
Maintenance
Complete installation and maintenance instructions are given in
IM-3-023-US, a copy of which is supplied with each regulator.
Available spare parts are shown on TI-1-1120-US and TI-3-0271-US.
TI-3-023-US
Spirax Sarco, Inc., 1150 Northpoint Blvd, Blythewood, SC 29016
Telephone: (803) 714-2000 FAX (803) 714-2222
4.12
© Spirax Sarco, Inc. 2012
No. Part Material
1
Valve Body
Cast Iron
Cast Steel
2
Cover
Cast Iron
Cast Steel
3
Cover Bolts
Steel
4
Main Valve Head
Stainless Steel
5
Main Valve Seat
Stainless Steel
6
Main Valve Seat GasketCopper
7
Valve Return Spring
Stainless Steel
8
Valve Stem
Stainless Steel
9
Strainer Screen
Stainless Steel
10
Valve Stem Sleeve
Stainless Steel
11
Spring Guide
Cast Iron ½"-2"
CRS 2"* - 4"
12Nut
Steel
13
Cover Gasket
Graphite
14
Pressure Equalizer Pipe
Stainless Steel
15 Upper Diaphragm Case
Cast Iron
Cast Steel
16
Stem Bushing
Stainless Steel
(2½" - 4" Cast Steel only)
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