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.
Specifications
Available Models
- 143-80-1: Standard regulator
- 143-80-2: Regulator with internal relief valve (IRV)
- 143-80-6: Regulator with internal relief valve and low-pressure cut-off (LPCO)
- 143-8-2HP: High-Pressure regulator (up to 6 psi outlet pressure)
Construction
- Valve Body: Cast iron (125 psi working pressure)
- Spring & Lower Case: Die-cast aluminum
- Orifice: Aluminum
- Valve Seat: One-piece molded Buna-N
- Valve Stem: Fiberglass-reinforced nylon
- Diaphragm: Nylon fabric-reinforced Buna-N (26 in² effective area)
- Vent: 1" NPT polyethylene vent and valve
- Corrosion Protection: Chromate conversion coating with enamel topcoat
Pressure Ratings
- Maximum Inlet Pressure: Up to 125 psi (model and orifice dependent)
- Maximum Outlet Pressure: Up to 6 psi
- Operating Temperature Range: -20°F to +150°F
- Internal Relief Valve Setting: Relieves at approximately 7–10" w.c. above normal outlet pressure
For detailed capacity tables, spring selections, orifice sizing, and dimensional drawings, refer to the product documents above.
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.
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 COâ‚‚, 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.
Talk to an Industrial Gas Control Expert
Whether you’re specifying industrial gas regulators, selecting industrial relief valves, or upgrading critical gas infrastructure, we can help you identify the right solution for your application.
