Description

INTERNAL RELIEF MODEL 143-80-2

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The Model 143-80 is an excellent general purpose gas pressure regulator. It can be used for natural gas, air, CO2, propane, butane, nitrogen, and other gases. It can be used for gas services to homes, commercial establishments and small industries, for burners, unit heaters, boilers, and other equipment. The Model 143-80-2 includes an internal relief valve.

Valve Body: Cast Iron – 125 psig working pressure
Spring and Lower Case: Die-Cast Aluminum
Orifice: Aluminum
Fulcrum Pin: Stainless Steel
Valve Seat: One piece molded Buna-N
Valve Stem: Fiberglass reinforced nylon
Throat/Support/Stem: Acetal insert
Diaphragm Plate: Plated Steel
Diaphragm: Nylon fabric-reinforced Buna-N with full 26 in2 effective area
Vent and Valve: Polyethylene valve and seat, 1 NPT vent
Operating Temperature: -20 to +150 F (-28.9 to +65.5 C)
Corrosion Protection: Cases dip primed chromate conversion coating, enamel topcoat
Internal Relief Valve: Set to relieve at approximately 7-10 w.c. above normal outlet
pressure setting

PERFORMANCE CURVE OF INTERNAL RELIEF VALVE:

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Also see:

• Sensus 143-80-6 Low Pressure Cut-off Regulator

Accessories:

• Sensus 143-60-011-00 BUNA-N Valve Seat

Resources:

• Sensus 143 Model Technical Literature
• Sensus 143 Installation Instructions
• Precursory Equimeter 143-80 Installation Instructions and Parts List
• Sensus Regulator Orifice Removal Procedure
• Sensus 143 Approval
• Sensus UL/ANSI/CSA Testing Notice