325OPD_MS_EN_10.2007
Replaced BULLETIN MS2084 -12/03
325-7L210D Line Pressure Regulators
and over-pressure protection devices (OPD)
CSA Design Certified
Z21.80 / CAN 6.22
Maximum Inlet Pressure:
CSA Certified ....................................... .............5 psi (140 mbar)
Minimum Inlet Pressure
CSA Certified.......................................................1.5 psi (103 mbar)
Emergency Exposure Limits:
(inlet side only) ................................................... 65 psi (4.5 bar)
Outlet Pressure Range:
Certified spring ............................................... 7 - 11 inches w.c.
Maximum Individual Load:
Largest single appliance served (by the regulator)
325-7L (1
Largest single appliance served (regulator with OPD)
325-7L210 (1
Capacity:
Total load of all appliances combined (regulator)
325-7L(1
Total load of all appliances combined (regulator with OPD)
325-7L210 (1
Venting:
325-7L ...................................................................... 1/2" NPT
OPD 210 .................................................................. 1/2" NPT
Pressure Drop: (1") ............................................. 250,000 Btu/hr
1/4
1/2
", 1
" ) ......................................... 900,000 Btu/hr
1/4
1/2
", 1
") .......................................... 900,000 Btu/hr
1/4
1/2
", 1
") ............................................... 1,000,000 Btu/hr
1/4
1/2
", 1
") ........................................... 900,000 Btu/hr
For piping systems
up to 5-psi
Attention: To comply with the ANSI Z21.80 Standard for Line
Pressure Regulators, installations exceeding 2-psi nominal require
a tested and approved over-pressure protection device (OPD) for
use with the regulator.
Gases:
Intended for application in natural gas piping systems up to 5 psi.
Ambient Temperature Limits:
-40° to 205°F (0° to 96°C)
Note: All Maxitrol gas appliance regulators must be installed and
operated in accordance with Maxitrol's 'Safety Warning' bulletin.
There is no vent limiter available for the 325-7L210D.
© 2007, Maxitrol Company, All Rights Reserved.
Line Regulators with OPDs
325 Series
The new line pressure regulator standard - ANSI Z21.80
FEATURES:
• CSA certified for up to 5-psi inlet pressure...
• Over-pressure protection device (OPD) to limit
downstream pressure in case of regulator failure...
• Maxitrol OPD approved and tested with the regulator...
• Self-aligning valve with lever action for dead end
regulator lockup...
BENEFITS:
• Meets new ANSI standard Z21.80 for line pressure
regulators for use on piping systems such as CSST or
semi-rigid copper tubing up to 5-psi...
• OPD provides required downstream over-pressure
protection for supply pressures in excess of 2-psi...
• Pounds to inches regulator provides precise control from
pilot flows to full regulator capacity...
• Meets many utility specifications...
Although Maxitrol's 325 Series are certified (ANSI Z21.18)
as appliance regulators (see bulletin 325LVR_MS_EN), in
the past they have often been used as line pressure
regulators. Until very recently, there was no standard for
line pressure regulators.
Z21.80 is the new ANSI standard for line pressure
regulators, intended for application in natural gas piping
systems. As of May 1, 2002, CSA requires that all line
pressure regulators above 2-psi must leave the factory preassembled and leak tested. At supply pressures in
excess of 2-psi, the new line regulator standard requires a
means (an over-pressure protection device / OPD) —
approved and tested with the regulator — to limit the
downstream pressure to 2-psi maximum, in the event of
regulator failure. In other words, to comply with the
standard, installations exceeding 2-psi nominal require
a tested and approved over-pressure protection device
for use with the regulator. Maxitrol-built OPDs provide
the required downstream over-pressure protection.
The 325 Series are suitable for limited horizontal mounting
(less than or equal to 90° from upright). Install the
regulator properly with gas flowing as indicated by the
arrow on the casting. The 210 OPD must be installed in a
horizontal position.
To deliver positive dead-end lock up, the 325 Series
feature a high leverage valve linkage assembly. Lockup
pressure can vary with the speed of the solenoid valve and
its location. The regulators are capable of precise
regulating control from full flow down to pilot flows.
The self-aligning valve is made of nitrile rubber. Housings
are durable aluminum die castings and all internal parts
are carefully selected and corrosion resistant. The
diaphragms are of high quality supported synthetic rubber
compounds.
The regulator with OPD is certified for inlet pressures up to
5-psi. The regulator alone provides no downstream overpressure protection in the event of failure.
Other 325 Series regulators will continue to be available as
CSA certified appliance regulators, as well as non-certified
models for up to 10-psi inlet pressure (see bulletin
325LVR_MS_EN).
© 2007, Maxitrol Company, All Rights Reserved.
2
Capacities and Pressure Drop -
2-psi applications, regulator, regulator with OPD
CAPACITIES - 0.64 sp gr gas expressed in CFH (m3/h)
Model Number
(pipe size)
Outlet
Pressure
Set Point
Operating Inlet Pressure
1/2
1
psi
(103 mbar)
2 psi
(138 mbar)
325-7L
1/4
1/4
", 1
", 1
1/2
1/2
(1
325-7L210
(1
7.0"
")
10.0"
7.0"
")
10.0"
1000 (28.3)
1000 (28.3)
900 (25.5)
900 (25.5)
Capacity:
Total load of all appliances combined
1/4
1/2
", 1
325-7L (1
325-7L210 (1
") ............................................ 1,000,000 Btu/hr
1/4
1/2
, 1
) ................................................ 900,000 Btu/hr
PRESSURE DROP - 0.64 sp gr gas expressed in CFH (m3/h)
Model Number
(pipe size)
325-7L
1/4
1/4
", 1
", 1
1/2
1/2
(1
325-7L210
(1
7.0" w.c. (17 mbar)
")
")
1/2 psi (34 mbar)
695 (19.7) 975 (27.6) 1189 (33.7)
660 (18.7) 930 (26.3) 1140 (32.3)
1000 (28.3)
1000 (28.3)
900 (25.5)
900 (25.5)
Maximum Individual Load:
Largest single appliance served by the regulator
1/4
325-7L (1
325-7L210 (1
1/2
", 1
") .......................................... 900,000 Btu/hr
1/4
1/2
", 1
") ................................... 900,000 Btu/hr
3/4 psi (52 mbar)
Pressure Drop Chart
100
100
10
Pressure Drop ( P)
10
mbar
Inches w.c.
1
2.5
CFH
3
m3/hr
Flow Rate
325-7L210
325-7L
1000100
10
30
© 2007, Maxitrol Company, All Rights Reserved.
3
Dimensions and Spring Range -
applications above 2-psi, regulator and OPD
A
325-7L210
B
DIMENSIONS - inches (millimeters)
A
7"
(178)
Call-Outs
B
15 3/8
(391)
C
9"
(229)
Model
Number
325-7L210
* standard models NPT threads.
'M' models available with ISO7 PL, 'MK' models ISO7 TR.
Note: Dimensions are to be used only as an aid in designing
clearance for the regulator. Actual production dimensions may vary
somewhat from those shown.
Pipe
Size*
1 1/4
1 1/2
Swing
Radius
6.75
(171)
Outlet Pressure Range (all models):
Certified spring .................................... 7 - 11 inches w.c.
Attention: To comply with the ANSI Z21.80 Standard for Line
Pressure Regulators, installations exceeding 2-psi nominal require a
tested and approved over-pressure protection device (OPD) for
use with the regulator.
C
Sizing Instructions
To select a line regulator of ample flow - one must know:
1. Available inlet pressure (maximum static/minimum operating).
2. Desired outlet pressure.
3. Required maximum capacity
(total load, all appliances combined),
and maximum individual load.
4. Pipe size.
Example: To select a line regulator with OPD of ample capacity
to handle flow. . .
KNOWN:
A. Required: 1
w.c., with a static pressure of 5-psi, and a minimum operating
inlet pressure of 3/4 psi.
B. Combined Btu rating of all appliances to be served by the
regulator: 850,000 Btu/hr.
C. Largest single appliance's Btu rating: 750,000 Btu/hr.
© 2007, Maxitrol Company, All Rights Reserved.
1/2
" NPT line regulator with OPD, outlet pressure of 7"
www.maxitrol.com
SOLUTION:
A. In the Capacities chart (page 3), locate rows where 1
size) models with 7" w.c. outlet pressure - intersect with - 3/4
psi operating inlet pressure column.
325-7L210 (1
B. The total Btu load requirement cannot exceed the equivalent CFH
result from step-A.
C. The 90,000 Btu/hr single largest appliance rating is below the
325-7L210 maximum individual load capacity of 900,000 Btu/hr.
D. The 325-7L210 is the acceptable (1
for this application.
1/2
") = 900 CFH.
1/2
") line regulator with OPD
1/2
" (pipe
Maxitrol Company
23555 Telegraph Rd., P.O. Box 2230
Southfield, MI 48037-2230 U.S.A.
248.356.1400 • Fax 248.356.0829
European Representatives
Warnstedter Strasse 3 06502 Thale, Germany
49.3947.400.0 • Fax 49.3947.400.200
Industriestrasse 1 48308 Senden, Germany
49.2597.9632.0 • Fax 49.2597.9632.99
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