1-800-267-8508 • www.nationalfire.comVancouver • Calgary • Edmonton • Mississauga • Toronto • Ottawa • Moncton

National Fire Equipment Ltd.

Rated Pressure: 300 psi / 2069 kPa.(Recommended to 175 psi (1207 kPa) per NFPA)Construction: Forged brass body with red hand wheelApprovals: ULC (CE1258), UL (12HO), FM Approved

(A155S and A156S ULC Listed Only)

Application: Used to limit pressures under flowing conditions

VALVE SPECIFICATIONS

National Fire Equipment restricting valves have become the standard for limiting pressures in fire hose streams. All valves come complete with setting information and can be adjusted while the system is fully charged. Constructed of quality forged brass and available with a variety of finishes and hose threads. The A155 & A156 valves conform to the NFPA-14 Standard as an approved pressure restricting device for a means of limiting residual pressures in standpipe systems to a degree that persons untrained in the handling of heavy fire streams can manage the fire hose nozzle. Trained personnel can over-ride the restricting feature by removing the locking pin so the valve can be fully opened. Normally used for inlet pressures greater than 100 PSI (690kPa) and less than 175 PSI (1207 kPa). Verify with local authority having jurisdiction for local requirements. For integral hydrovent on 1½" (38mm) valves use Model A155S (double NPT female) and Model A156S (male NPSH outlet). For pressures greater than 175 PSI (1207 kPa) use NFE pressure regulating valves to control pressures under flow and no flow conditions.

A155 -A 156 PRESSURE RESTRICTING DEVICES

How to use the valves

The valves are capable of adjustment to provide a range of the outlet pressures under flowing condition only.

Determining the proper outlet pressure

1- The valves are reducing the downstream water pressure under flowing (residual) condition only. The valve should not be set to provide less than the minimum pressure required by NFPA 14 while flowing 250 GPM for 2 1/2 inch size and 100 GPM for 1 1/2 inch size.

NFPA 14-2007 Edition requires that Standpipe systems shall be hydraulically designed to provide the required water flow rate at a minimum residual pressure of 100 PSI at the outlet of hydraulically most remote 21/2 in. hose connection and 65 PSI at the outlet at the hydraulically most remote 1 1/2 in. hose station.Outlet pressures which do not correspond to NFPA 14 requirements must be authorized by local fire department.There will be a pressure drop due to friction between the outlet and the nozzle.The amount of this loss should be calculated by qualified personnel, to assure that the nozzle receives water pressure sufficient to its design needs.Note that some fire hose nozzles may not operate properly when valve outlet pressure is set at the 100 PSI minimum authorized in the 2007 edition of NFPA 14.The installer should consult with the fire authorities concerning pressures needed by their equipment.The outlet pressures indicated in the curves are at the outlet of the valve.

2- To determine the pressures at the hose nozzle, the hydraulic calculation information provided in NFPA Fire Protection Handbook should be followed.

3- The valves are designed and Listed to reduce inlet pressures under flowing conditions: see the enclosed graphs.

Authorities having jurisdiction should be consulted to confirm that the outlet pressures and flowrates are acceptable.

Installation

1- Pipe unions or rubber-gasketed fittings are to be installed immediately up-stream and downstream of the

valve to permit easy replacement.

2- Connect the valve to the piping.

3- Select setting number from proper graph.

4- Close valve hand-tight.

5- Loosen set screw in collar.

6- Rotate indicator-cap untill top collar reaches selected setting number.

7- Tighten set screw in collar. Valve is now set.

8- To override pressure restriction, pull spring clip.See Fig.1.

1- In the event the valve leaks, the test valve should be opened again to flush the valve.

2- The valve should be inspected for damage or corrosion annually.

3- The valve is not designed to accept replacement parts.

4- The system should be drained every two to three years and all valves opened fully and lubricant applied to the valve stem. The valve seat should be inspected for debris.

5- The valve should be operated by hand, never using a torque bar or other device to exert pressure. Excess torque may damage the seat and or stem, disc, and other working parts.

6- If the valve fails to perform as intended, the valve should be replaced.

Technical features

The valves are designed and Listed to operate at max. pressure 175 PSIG.

200

150

100

5010 15 205

OU

TLET

PRE

SSU

RE P

SI

SET NUMBERS

200

150

100

50

10 15 205O

UTL

ET P

RESS

URE

PSI

SET NUMBERS0

0

- - - - - - - - - - - - - - - - - - - - - - - - - COLLAR TOPSET AT 15

A155 - A156 11/2”Set numbers are based on figuresobtained using 50 Ft of 11/2” hoseand a 1/2” non-adjustable nozzle.Inlet pressure 175 PSI and flow 100 GPM

A155 - A156 2 1/2”Set numbers are based on figuresobtained using 50 Ft of 21/2” hoseand a 1 1/8” non-adjustable nozzle.Inlet pressure 175 PSI and flow 250 GPM

Double FemaleRed handwheel

A156 Pressure Restricting DeviceAngle Valve 175 lb.Rated

Fig.1

PULL(Installation, refer to par.8)

APPROVED CEX 1258 LISTED 12HOAPPROVED CEX 1258 LISTED 12HO

NOTEFor the setting refer tothe collar top indicator.

- - - - - - - - - - - - - - - - - - - - - - - - - COLLAR TOP

SET AT 15

National Fire Equipment Ltd.

WARNING!The graphs are referred only to the indicated conditions of flow and pressure, as tested at Giacomini test station. Should the local codes or the designing Engineer require graphs for different conditions, or the test procedure on the field is specified, please contact your local NFE representative for alternate graphs to suit field conditions.

• These valves are intended for use in Class III Standpipe systems.• Pipe unions or rubber-gasketed fittings are to be installed immediately upstream of the valve to permit easy replacement• If the valve fail to perform as intended, the valve would need to be replaced.

Maintenance & Testing:

Maintenance and testing should be in accordance with NFPA 25.

1-800-267-8508 • www.nationalfire.com

Vancouver • Calgary • Edmonton • Mississauga • Toronto • Ottawa • Moncton

Female x Male

insertion of a wire, not to lose the spring.

Hole which allows the Red handwheel

A155s Pressure Restricting DeviceAngle Valve 175 lb.Rated

A155-A156 1-1/2" 80 gpm 100 ft hose

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A155-A156 1-1/2" 70 gpm 100 ft hose

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A155-A156 1-1/2" 60 gpm 100 ft hose

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A155-A156 1-1/2" 50 gpm 100 ft hose

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A155-A156 1-1/2" 100 gpm 100 ft hose

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A155-A156 1-1/2" 90 gpm 100 ft hose

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175 160 150 140 130 120 110 100 90 80 70 60Inlet pressure psi

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setting 15setting 12setting 10setting 8setting 7

1-800-267-8508 • www.nationalfire.com

Vancouver • Calgary • Edmonton • Mississauga • Toronto • Ottawa • Moncton