The BelGAS P143 Series relieving gas pressure regulator is engineered for precise control in residential, commercial, and light industrial gas systems. Designed to regulate natural gas, propane, and air, the P143 features an internal relief mechanism, offering both regulation and overpressure protection in one compact unit.

With a cast iron body and aluminum bonnet, this rugged and versatile regulator is commonly used in applications such as burners, unit heaters, and HVAC systems. The P143 provides dependable performance in environments requiring low-pressure gas delivery and integral safety relief

Key Features:

• Integrated internal relief function for added safety

• Compact design ideal for limited-space installations

• Wide pressure range adjustment via color-coded spring

• Reliable performance in natural gas, propane, and air systems

• Suitable for residential and light industrial use

Technical Specifications:

• Manufacturer / Brand: BelGAS, a division of Marsh Bellofram

• Model: P143S0806063F00

• Series: P143 Series

• Function: Relieving gas pressure regulator (Standard, Non-LPCO)

• Connection Size: 1" x 1" NPT female ports

• Spring Type & Range: Orange spring, 12" – 28" water column (WC)

• Orifice Size: 3/8 inch

• Body Material: Cast iron

• Bonnet Material: Aluminum

• Diaphragm Material: Nitrile (NBR)

• Spring Material: Zinc-plated steel

• Diaphragm Assembly: Zinc/Nitrile

• Gasket Material: Non-asbestos (CGR 2750)

• Temperature Range: –20°F to 150°F (–29°C to 66°C)

• Maximum Inlet Pressure: 40 PSIG (based on standard 3/8" orifice rating)

• Relief Feature: Internal self-relieving mechanism

• Mounting Orientation:

  • Body: Downward (code 2)

  • Vent: 9 o'clock position (code F)

• Approximate Weight: 5.63 lb (2.6 kg)

• Typical Applications:

  • Natural gas and propane regulation

  • Gas burners and unit heaters

  • HVAC systems and other low-pressure gas control setups