Maxitrol 325 Series User manual
Emergency Exposure Limits
All models (Inlet Side Only)................................... 65 psi (450 kPa)
Maximum Individual Load
Largest single appliance served by the regulator.
325-3(B) .................................................................100,000 Btu/hr
325-5A(B) .............................................................. 250,000 Btu/hr
325-7A(B) ........................................................... 1,250,000 Btu/hr
Capacity
Total load of multiple appliances combined.
325-3(B) (3/8”, 1/2”) ................................................150,000 Btu/hr
325-5A(B) (1/2”, 3/4”, 1”) ........................................ 300,000 Btu/hr
325-7A(B) (1 1/4”, 1 1/2”) .................................... 1,250,000 Btu/hr
NOTE: Capacity table is used to determine the maximum multiple
appliance load.The largest single appliance served by the
regulator should not exceed the maximum individual load
Ambient Temperature Limits
All Models .................................... -40ºF to 205ºF (-40ºC to 96ºC)
Vent Pipe Connections
325-3(B) ..........................................................................1/8” NPT
325-5A(B) ....................................................................... 3/8” NPT
325-7A(B) ........................................................................1/2” NPT
325 Series pounds to inches regulators are for use on residential,
commercial, and industrial applications.
The 325 Series features a high leverage valve linkage assembly
to deliver positive dead-end lock-up. The regulators are capable of
B Models: Imblue Technology™ increases corrosion resistance
and provides extra protection against the elements for regulators
used in outdoor applications.
NOTE: (B) in model number designates Imblue Technology™.
1
SPECIFICATIONS
Gases
petroleum gases, and LP gas-air mixtures.
Approvals
CSA: ANSI Z21.18/CSA 6.3
Maximum Inlet Pressure
Model Maxitrol Tested
325-3(B)
325-5A(B)
2 psi (13.8 kPa),
5 psi (34.5 kPa) 10 psi (69 kPa)
325-7A(B)
Model With 12A09, 12A39, or 12A49 Installed
Maximum Inlet Pressure
325-3(B)
325-5A(B)
325-7A(B)
NAT: 5 psi (34.5 kPa)
LP: 2 psi (13.8 kPa)
Model Inlet Pressure Spring Ranges
325-3(B) 2 psi (13.8 kPa)
325-3(B)
325-5A(B) 5 psi (34.5 kPa)
325 Series Appliance Pressure Regulators
For 2 psi, 5 psi, and 10 psi piping systems.
© 2011 Maxitrol Company, All Rights Reserved.
DESCRIPTION
325-3 325-7A
325-5AB
325-3B 325-7AB
325-5A
NOTICE
These regulators provide no do
in the event of failure. At supply pressures in excess of 2 psi,
are rated for supply pressure or protected by some other means.
For Technical Support contact a Maxitrol Technical Support
Representative. See Maxitrol Safety Warning Instructions,
GPR_MI_EN.ES
Figure 1: 325 Series Appliance Regulators
TABLE OF CONTENTS
Description .................................................................................. 1
Pressure Drop ............................................................................ 2
Capacities ................................................................................... 3
Dimensions ................................................................................. 3
Spring Selection Chart .............................................................. 4
Sizing Instructions ...................................................................... 4
Mounting Position
The 325 Series is suitable for multi-poise
limiting device, the regulator must be
mounted in a horizontal upright position
(see Figure 2). Install the regulator
sting. (See Maxitrol
Safety Warning Instructions, GPR_MI_
EN.ES)
UPRIGHT
Figure 2: 325 Regulator
in Upright Postion
PRESSURE DROP - 0.64 sp. gr. gas expressed in CFH (m3
Model
Pressure Drop
7.0” w.c.
1/2 psi
3/4 psi
1 psi
2 psi
325-3(B) 145 (4.0) 204 (5.8) 250 (7.0) 289 (8.2) __
325-5A(B) 338 (9.6) 476 (13.5) 583 (16.5) 673 (19.1) __
325-7A(B) 815 (23.1) 1149 (32.5) 1405 (39.8) 1624 (46.0) 2305 (65.3)
2
© 2011 Maxitrol Company, All Rights Reserved.
325 Series Appliance Pressure Regulators
NOTEl’s Safety Warning Instructions.
Figure 4: Pressure Drop Chart
1 2 3 4 5 6 8 10 20 30 40 60 80 100 200
.7
.8
.9
1
2
3
4
5
6
7
8
9
10
20
1
10
100
10 100 1000 10000
Pressure Drop (kPa)
Flow Rate (m3 @ 0.64 SG gas)
Pressure Drop (in. w.c.)
Flow Rate (cfh @ 0.64 SG gas)
3
2
5-
3
(
B
)
3
2
5-
5
A
(B
)
3
2
5-
7
A
(B
)
® Vent Limiting Devi
325-3(B) .............................................................................12A09
325-5A(B) ..........................................................................12A39
325-7A(B) ...........................................................................12A49
®
325-3(B) .............................................................................13A15
325-5A (B) ........................................................................13A15-5
325-7A (B) ............................................................................13A25
Figure 3: Vent Accessories
13A15 (1/8” NPT) 13A25 (1/2” NPT)
13A15-5 (3/8” NPT)
12A49 (1/2” NPT)
12A09 (1/8” NPT) 12A39 (3/8” NPT)
NOTICE
Maxitrol vent limiting devices eliminate the need to run vent
piping to the outside. Vent limiting devices are designed for
escapement due to diaphragm failure is critical. Vent limiting
the environment. Vent protectors are available for all outdoor
applications to ensure proper vent protection.
® Vent Limiting Devices
® Vent Protectors
3
Model Number
Outlet
Pressure
Set Point
CSA
Maximum
Operating Inlet Pressure
1/2 psi
3/4 psi
1 psi
2 psi
5 psi
10 psi
325-3(B)
(3/8”, 1/2”)
(1.0 kPa)
150
(4.2)
160
(4.5)
190
(5.4)
220
(6.2)
220
(6.2)
300
(8.5)
320
(9.1)
(1.7 kPa)
150
(4.2)
120
(3.4)
150
(4.2)
180
(5.1)
220
(6.2)
290
(8.2)
320
(9.1)
(2.5 kPa)
150
(4.2)
100
(2.8)
120
(3.4)
150
(4.2)
220
(6.2)
280
(7.9)
320
(9.1)
325-5A(B)
(1/2”, 3/4”, 1”)
(1.0 kPa)
300
(8.5)
300
(8.5)
340
(9.6)
416
(11.8)
500
(14.2)
600
(17.0)
680
(19.3)
(1.7 kPa)
300
(8.5)
245
(6.9)
315
(8.9)
340
(9.6)
480
(13.6)
600
(17.0)
680
(19.3)
(2.5 kPa)
300
(8.5)
225
(6.4)
270
(7.6)
312
(8.8)
430
(12.2)
560
(15.9)
680
(19.3)
325-7A(B)
(1 1/4”, 1 1/2”)
(1.0 kPa) --- 850
(24.0)
1060
(30.0)
1190
(33.7)
1600
(45.3)
2090
(59.2)
2190
(62.0)
(1.7 kPa) --- 780
(22.0)
950
(26.9)
1060
(30.0)
1500
(42.5)
1860
(52.7)
2060
(58.3)
(2.5 kPa) --- 650
(18.4)
860
(24.4)
990
(28.0)
1300
(36.8)
1620
(45.9)
2060
(58.3)
Maximum approved capacity for 325-3(B) is 100 CFH (2.8 m3/h), 325-5A(B) is 250 CFH (7.1 m3
Approval based on use as an appliance regulator.
** Set points (in CFH): 325-3(B) = 50, 325-5A(B) = 150, 325-7A(B) = 500.
CAPACITIES - 3
© 2011 Maxitrol Company, All Rights Reserved.
325 Series Appliance Pressure Regulators
DIMENSIONS -
Model
Number Swing
Radius
Dimensions
A B C
325-3(B) 3/8”, 1/2” 3
(76)
3 1/2
(89)
4 1/4
(108)
3 7/8
(98)
325-5A(B) 1/2”, 3/4”, 1” 4 7/8
(124)
5 1/4
(133)
5 7/8
(149)
5 7/16
(138)
325-7A(B) 1 1/4”, 1 1/2” 6 1/8
(156)
7 1/4
(184)
8
(203)
7
(178)
.
NOTE: Dimensions are to be used only as an aid in designing
clearance for the regulator. Actual production
B
C
A
B
C
A
B
C
A
325-3 325-5A 325-7A
Maxitrol Company
23555 Telegraph Rd., P.O. Box 2230
© 2011 Maxitrol Company,
All Rights Reserved.
4
325 Series Appliance Pressure Regulators
APR_MS_EN_09.2011
Replaces 325 LVR_MS_EN
SIZING INSTRUCTIONS
TO SELECT AN APPLIANCE REGULATOR OF SUFFICIENT FLOW - ONE MUST KNOW:
1. Available inlet pressure (maximum static/minimum operating).
2. Desired outlet pressure.
4. Pipe size.
Example:
KNOWN:
B. Pipe size 1/2”.
C. Operating inlet pressure 2 psi.
SOLUTION:
A. Check pressure drop chart, page 2.
correct regulator to use for this application.
SPRING SELECTION CHART
Model
Number
Standard
Spring Other Springs Available
325-3(B) 5 to 9
(1.25 to 2.25)
7 to 11
(1.7 to 2.7)
6 to 10
(1.5 to 2.5)
7 to 11
(1.7 to 2.7)
4 to 12
(1.0 to 3.0)
2 to 6
(0.5 to 1.5)
10 to 22
(2.5 to 5.5)
15 to 30
(3.7 to 1.5)
1 to 2 psi
(6.9 to 13.9)
325-5A(B) 5 to 9
(1.25 to 2.25)
7 to 11
(1.7 to 2.7)
6 to 10
(1.5 to 2.5)
7 to 11
(1.7 to 2.7)
4 to 12
(1.0 to 3.0)
2 to 6
(0.5 to 1.5)
10 to 22
(2.5 to 5.5)
15 to 30
(3.7 to 1.5)
1 to 2 psi
(6.9 to 13.9)
325-7A(B) __ __ __ __ 4 to 12
(1.0 to 3.0)
2 to 5
(0.5 to 1.2)
10 to 22
(2.5 to 5.5)
15 to 30
(3.7 to 1.5)
20 to 42
(5.0 to 10.4)
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6
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