Maxitrol 325-3BL User Manual

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Page 1

325 Series Line Pressure Regulators

For 2 PSI Piping Systems

TABLE OF CONTENTS

Description .................................................................................. 1

Specications ........................................................................... 1, 2

Pressure Drop ............................................................................ 2

Capacities ................................................................................... 3

Dimensions ................................................................................. 3

Spring Range Selection .............................................................. 4

Sizing Instructions ...................................................................... 4

DESCRIPTION

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

precise regulating control from full ow down to pilot ow.

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™.

325-3L

325-3BL 325-5ABL

Figure 1: 325 Series Line Pressure Regulators

325-5AL

325-7AL

325-7ABL

Maximum Individual Load

Largest single appliance served by the regulator.

325-3(B)L ...............................................................140,000 Btu/hr

325-5A(B)L ............................................................ 300,000 Btu/hr

325-7A(B)L .........................................................1,250,000 Btu/hr

NOTICE

These regulators provide no downstream over-pressure protection in the event of failure. At supply pressures in excess of 2 psi, they should not be used. For Technical Support contact a Maxitrol Technical Support Representative. See Maxitrol Safety Warning Instructions, GPR_CSA_2PSI_MI_EN.FR

SPECIFICATIONS

Gases

Suitable for natural, manufactured, mixed gases, liqueed

petroleum gases, and LP gas-air mixtures.

Approvals

CSA: ANSI Z21.80/CAN 6.22

Maximum Inlet Pressure

Model CSA Certied

325-3(B)L

2 psi (13.8 kPa)325-5A(B)L

325-7A(B)L

Minimum Inlet Pressure

CSA Certied...............................................................1 psi (7 kPa)

Outlet Pressure Range

Certied Spring ............................................................. 7 - 11” w.c.

Emergency Exposure Limits

All Models (Inlet Side Only) ................................ 65 psi (450 kPa)

Capacity

Total load of multiple appliances combined.

325-3(B)L (3/8”, 1/2”) .............................................. 250,000 Btu/hr

325-5A(B)L (1/2”) ................................................... 425,000 Btu/hr

325-5A(B)L (3/4”, 1”) .............................................. 550,000 Btu/hr

325-7A (B) L (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 specied above.

Ambient Temperature Limits

All Models ..................................... -40ºF to 205ºF (-40ºC to 96ºC)

Vent Pipe Connections

325-3(B)L ....................................................................... 1/8” NPT

325-5A(B)L ..................................................................... 3/8” NPT

325-7A(B)L ..................................................................... 1/2” NPT

Mounting Position

The 325 Series is suitable for multi-poise mounting, but when used with a vent

limiting device, the regulator must be mounted in a horizontal upright position (see Figure 2). Install the regulator

properly with gas owing as indicated by the arrow on the casting. (See

Maxitrol Safety Warning Instructions, GPR_CSA_2PSI_MI_EN.FR).

UPRIGHT

Figure 2: 325 Regulator in Upright Postion

Page 2

325 Series Line Pressure Regulators

12A09 (1/8” NPT)

Figure 3: Vent Accessories

Vent Limiting Devices

Vent Protectors

13A15 (1/8” NPT)

12A39 (3/8” NPT)

13A15-5 (3/8” NPT)

12A49 (1/2” NPT)

13A25 (1/2” NPT)

Vent Limiting Devices for Indoor Applications

325-3(B)L ...........................................................................12A09

325-5A(B)L .........................................................................12A39

325-7A(B)L .........................................................................12A49

NOTICE

Maxitrol vent limiting devices eliminate the need to run vent piping to the outside. Vent limiting devices are designed for

use indoors and in spaces where limiting the amount of gas

escapement due to diaphragm failure is critical. Vent limiting devices should not be used outdoors if they are exposed to the environment. Vent protectors are available for all

outdoor applications to ensure proper vent protection.

Vent Protectors for Outdoor Applications

325-3(B)L ............................................................................13A15

325-5A(B)L ......................................................................13A15-5

325-7A(B)L .........................................................................13A25

PRESSURE DROP: 0.64 sp gr gas expressed in CFH (m

Model Number

7.0” w.c. (1.7 kPa) 1/2 psi (3.4 kPa) 3/4 psi (5 kPa) 1 psi (7 kPa)

/h) (for system pressure drop calculations)

Pressure Drop

325-3(B)L 145 (4.0) 204 (5.8) 250 (7.0) 289 (8.2)

325-5A(B)L 339 (9.6) 476 (13.5) 583 (16.5) 673 (19.1)

325-7A(B)L 815 (23.1) 1149 (32.5) 1405 (39.8) 1624 (46.0)

NOTE: All Maxitrol line pressure regulators must be installed and operated in accordance with Maxitrol’s Safety Warning Instructions.

Flow Rate (m3 @ 0.64 SG gas)

100

Pressure Drop (in. w.c.)

1 2 3 4 5 6 8 10 20 30 40 60 80 100 200

)

(

)

(

)

(

9 8

Pressure Drop (kPa)

1 .9 .8

10 100 1000 10000

Figure 4: Pressure Drop Chart

Flow Rate (cfh @ 0.64 SG gas)

Page 3

325 Series Line Pressure Regulators

CAPACITIES: 0.64 sp gr gas expressed in CFH (m

Model Number

(pipe size)

325-3(B)L (3/8”, 1/2”)

325-5A(B)L (1/2”)

325-5A(B)L (3/4”, 1”)

325-7A(B)L (1 1/4”, 1 1/2”)

Outlet Pressure

Set Point

7.0” w.c. (1.7 kPa)

10.0” w.c. (2.5 kPa)

7.0” w.c. (1.7 kPa)

10.0” w.c. (2.5 kPa)

7.0” w.c. (1.7 kPa)

10.0” w.c. (2.5 kPa)

7.0” w.c. (1.7 kPa)

10.0” w.c. (2.5 kPa)

/h)

Operating Inlet Pressure

1 psi (7 kPa) 1 1/2 psi (10 kPa) 2 psi (13.8 kPa)

250

(7.1)

230

(6.5)

425

(12.0)

425

(12.0)

550

(15.6)

535

(15.1)

1250

(35.4)

1125

(31.9)

250

(7.1)

250

(7.1)

425

(12.0)

425

(12.0)

550

(15.6)

550

(15.6)

1250

(35.4)

1250

(35.4)

250

(7.1)

250

(7.1)

425

(12.0)

425

(12.0)

550

(15.6)

550

(15.6)

1250

(35.4)

1250

(35.4)

DIMENSIONS: Expressed in inches (mm)

Model

Number

325-3(B)L 3/8”, 1/2”

325-5A(B)L 1/2”, 3/4”, 1”

325-7A(B)L 1 1/4”, 1 1/2”

* Standard models NPT threads

Pipe

Size*

Swing

Radius

(76)

4 7/8 (124)

6 1/8 (156)

Dimensions

A B C

3 1/2

(89)

5 1/4 (133)

7 1/4 (184)

4 1/4 (108)

5 7/8 (149)

(203)

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.

3 7/8

(98)

5 7/16

(138)

(178)

325-3(B)L

325-5A(B)L

325-7A(B)L

Page 4

325 Series Line Pressure Regulators

SPRING RANGE SELECTION

Outlet Pressure Range (all models):

Certied Spring .................................................. 7 - 11” w.c.

SIZING INSTRUCTIONS

When 325 Series regulators are used on 2 psi piping systems, often times the 2 psi systems are sized with a 1 psi pressure drop through the copper or stainless steel tubing. This means there will be 2 psi at the inlet of the regulator under no ow conditions, and 1 psi at the regulator inlet under maximum ow conditions.

TO SELECT A LINE PRESSURE REGULATOR OF SUFFICIENT 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 325 series regulator of sufcient capacity to handle ow...

KNOWN:

A. Required: 1/2” NPT line regulator, outlet pressure of 7” w.c., with static pressure of 2 psi, and a minimum operating inlet pressure of 1 psi.

B. Combined BTU rating of all appliances to be served by the regulator: 145,000 Btu/hr.

C. Largest single appliance’s BTU rating: 90,000 Btu/hr

SOLUTION:

A. In the Capacities Table (page 3), locate rows where 1/2” (pipe size) models with 7” w.c. outlet pressure intersect with 1 psi operating inlet pressure column. (325-3L = 250 CFH, 325-5AL = 425 CFH).

B. The total BTU load requirement cannot exceed the requirement, and does not exceed either model’s capacity.

C. The 90,000 Btu/hr single largest appliance rating is below the 325-3L maximum individual load capacity of 140,000 Btu/hr.

D. The 325-3L is the correct line regulator for this application.

Maxitrol Company 23555 Telegraph Rd., P.O. Box 2230 Southeld, MI 48037-2230 U.S.A.

LPR_MS_EN_09.2011 Replaces 325LPR_MS_EN

www.maxitrol.com