Pressure Regulator w/ Air Loaded Pilot 1/2" to 4" 25PA

Pressure Regulator w/ Air Loaded Pilot 1/2" to 4" 25PA
Pressure Regulator with Air Loaded Pilot
1/2" to 4" 25PA
25PA 1/2" to 2"
The Pressure
Pilot is loaded by
an external compressed air supply
rather than by a
spring. The downstream pressure
can be set remotely
by adjusting the
loading air pressure.
Model 25PA
A
Sizes
1/2" to 2"
C
Options
ANSI 250 flgd.
ANSI 150 flgd
(excludes 2")
125
450
E
232
D
on
ati
r
atu
s
m
a
Ste
200
rve
cu
ANSI 125
100
149
NPT+ ANSI 250
300
93
Temperature ˚C
204
400
0
200
100
150
(14)
(7)
Pressure psig (barg)
50
250
B
Air Pilots
PA direct air load maximum 120 psig air
38
Downstream Pressure Ranges
1
15
For proper selection, see TI-3-030-US
300
(20)
PA
3 to 100 psig
For selection and sizing data, see TI-3-030-US
Dimensions
Cast Steel
140
600
315
Size 500
450
on
300
m
a
Ste
200
ti
ura
t
sa
204
149
93
ANSI 150
38
100
1
300 350
100 150 200 250
(14)
(20)
(7)
285
Pressure psig (barg)
The product should not be used in shaded area.
15
0
50
Temperature ˚C
e
rv
cu
NPT+ ANSI 300
260
400
(approximate ratio 1:1), see table
Capacities
The product should not be used in shaded area.
Temperature ˚F
2", 2-1/2", 3", 4"
Connections
NPT ANSI 125 flgd.
NPT
ANSI 300 flgd.
Construction
Cast Iron Cast Steel Body
Cast Iron
Temperature ˚F
2-1/2", 3", 4" 1/2" to 2" A
(nominal) in inches*
Ansi 125 Ansi 250
Ansi 300
A1
A1
B
C
C1
D
E
E1
Weight
Cast Iron Cast Steel
1/2", 3/4" 5.5
––7.6
10.1
8.0
6.2
16.3
14.2
3235
1"
6.0
–
–
8.6
10.1
8.0
6.75
16.9
14.8
39
43
1-1/4", 1-1/2"
7.25
––8.6
10.1
8.0
7.1
17.7
15.6
4448
2"
8.5
–
9.0
10.6
11.3
9.2
8.2
19.5
17.4
69
75
2-1/2" – 10.911.513.611.9 9.913.925.823.8 157 171
3"
– 11.75
12.513.611.9 9.814.426.324.3 188 205
4"
– 13.914.515.613.2 11.1
16.129.327.3 284 309
* All pilots are interchangeable. Drawings are for dimensional purposes only.
For operation in this region, stainless steel transmission tubing need be fitted.
Note: Maximum temperature for Stainless Steel tubing is 600°F
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-3-019-US 04.12
Pressure Reducing Valve with Air Loaded Pilot
1/2" to 4" 25PA
3
3
52
2
11
13
7
1
24
25
4
5
6
24
25
2
13
7
1
4
5
14
9
8
10
12
11
25
24
17
28
27
19
18
15
19
15
21
22
24
20
21
22
23
24
26
½" to 2"
2"* to 4"
Stainless Steel
Stainless Steel
Brass 1/2" - 2"
Steel 2"* - 4" Cast Iron
Cast Steel
Brass 1/2" - 2"
C.I. 2"* - 4"
Stainless Steel
CRS
Stainless Steel
Copper
Brass
Brass
Steel
Stainless Steel
1/2" - 2" Copper Clad
2"* - 4" Graphite
ASTM A 126 CL B
ASTM A216 Gr WCB
ASTM A 126 CL B
ASTM A216 Gr WCB
ASTM A449
The valve 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 valve. The trap and regulator
should both be protected with a strainer. The pressure sensing line
should be located either in the downstream piping, or in the steam
space. Complete installation instructions are given in IM-3-000-US.
Air Loading Pilot PA Requires Air Loading
as indicated in the following table
Desired Outlet Steam
Pressure P2 psig
ASTM A 126 CL B
ASTM A216 Gr WCB
ASTM A 126 CL B
ASTM A216 Gr WCB
5
10
25
50 75
100
Inlet Pressure
P1 psig
10 psig to 100 psig
Approximate
Air Set Pressure
psig
11 16 31 56 80 102
to to to to to
to
13.516.833.558 81 103
Maintenance
Complete installation and maintenance instructions are given in
IM-3-000-US, a copy of which is supplied with each valve. Available
spare parts are shown on TI-1-1120-US and TI-3-0271-US.
© Spirax Sarco, Inc. 2012
17
Diaphragm Plate Stem
18
Diaphragm Stem Guide
19
Nut
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)
27
Connector Stud
28
Body Gasket
*ANSI 300 ONLY
Installation
Construction Materials
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 1/2"-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
(2-1/2" - 4" Cast Steel only)
20
TI-3-019-US
Spirax Sarco, Inc., 1150 Northpoint Blvd, Blythewood, SC 29016
04.12
Telephone: (803) 714-2000 FAX (803) 714-2222
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