Model 143 Natural Gas Pressure Regulator

The Model 143 natural gas pressure regulator is a compact, high-performance service regulator designed to deliver precise, dependable pressure control for residential and small commercial gas applications. Built with rugged materials and proven internal components, the Model 143 provides stable outlet pressure and long-term reliability in a wide range of operating conditions.

Frequently used for residential gas service, as well as light commercial and industrial applications, the Model 143 is well suited for burners, furnaces, ovens, heaters, and gas engines. With multiple body sizes, spring ranges, and orifice options available, this regulator delivers the flexibility and capacity expected from a 6" service diaphragm regulator while maintaining a compact footprint and simple installation.

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Model 143 Features

• Precise Pressure Control: Designed to deliver stable, repeatable outlet pressure across a wide range of residential and light commercial gas loads.

• Compact 6" Diaphragm Design: Provides excellent capacity and control in a small, service-friendly form factor.

• Multiple Safety Configurations Available: Offered in standard models, versions with an internal relief valve (IRV), and models with low-pressure cut-off (LPCO) for added protection.

• Flexible Mounting Positions: Union-nut style connection allows installation in virtually any orientation, improving field versatility.

• Durable Construction: Cast iron valve body and die-cast aluminum components provide corrosion resistance and long service life.

• Wide Range of Springs & Orifices: Seven outlet pressure ranges and multiple orifice sizes support a broad range of applications.

Benefits

• Reliable Residential & Light Commercial Service: Ideal for downstream regulation where consistent pressure is critical to safe appliance operation.

• Improved Installation Flexibility: Union connection simplifies installation and servicing without bolts or screws.

• Enhanced Safety Options: Internal relief valve and low-pressure cut-off configurations provide additional protection against abnormal operating conditions.

• Accurate Performance in a Compact Regulator: Delivers precise control without requiring oversized equipment.

• Proven, Field-Tested Design: Widely used across residential and small commercial gas systems with a strong track record of dependability.

Capability

The Model 143 regulator family supports a wide range of residential and small commercial gas service requirements.

• Application Types: Residential gas service, burners, furnaces, ovens, heaters, gas engines

• Gas Compatibility: Natural gas, propane vapor (LPG), air, nitrogen, dry CO₂, and other non-corrosive gases

• Installation: Indoor or outdoor (not suitable for buried service)

• Pipe Sizes: ¾", 1", and 1¼" body sizes available

• Outlet Pressure Ranges: From inches water column to up to 6 psi (spring dependent)
   

Optional low-pressure cut-off (LPCO) models automatically shut off gas flow when inlet pressure drops below acceptable levels and require manual reset for added safety.

Specifications