What does a gas pressure regulator do?
A gas pressure regulator reduces upstream gas supply pressure from the utility line to a lower, stable outlet pressure suitable for the appliance. Most commercial gas appliances require outlet pressure in the range of 3.5" to 14" W.C., while supply line pressure may be much higher. The regulator maintains consistent outlet pressure regardless of variations in supply pressure or downstream demand — ensuring safe and efficient combustion in boilers, unit heaters, commercial cooking equipment, and industrial burners.
What is the Maxitrol 325 series used for?
The Maxitrol 325 series is the most common lever-acting gas pressure regulator for commercial and light industrial heating equipment — unit heaters, rooftop heating units, commercial boilers, and commercial cooking equipment. Available in 3/8" through 2" NPT with inlet pressures up to 10 PSIG (Maxitrol-rated) and outlet pressure ranges depending on the spring selected. Capacities range from 140,000 BTU (325-3 in 3/8" and 1/2") up to 2,250,000 BTU (325-9 in 2" NPT).
What is the difference between the Maxitrol 325 and 210 series?
The 325 series is a lever-acting regulator for smaller commercial applications in 3/8" to 1" NPT pipe sizes. The 210 series is a heavy-duty gas appliance regulator for larger commercial and industrial applications in 1" to 3" NPT, with capacities up to 26,000,000 BTU (210G-3). The 220 series is a pilot-loaded version of the 210 for applications requiring more precise pressure control. Use the 325 series for most commercial heating; use the 210/220 series for large boilers, industrial burners, and high-BTU commercial equipment.
What is a Maxitrol Pakstat?
A Maxitrol Pakstat is a discharge air temperature sensing control used in Maxitrol modulating gas valve systems on gas-fired unit heaters and rooftop heating equipment. The Pakstat senses discharge air temperature and modulates the gas valve to maintain a setpoint temperature — improving fuel efficiency over simple on/off control. The P14 Pakstat covers 150–550°F; the P64 covers 50–250°F. They work with TS114 and TD114 discharge air sensors.
How do I select the right Maxitrol gas regulator?
You need four pieces of information: (1) pipe size — the NPT connection size at the regulator location; (2) inlet pressure — the gas supply pressure upstream of the regulator in PSIG or inches W.C.; (3) required outlet pressure — typically 3.5" to 14" W.C., specified on the appliance nameplate; (4) BTU capacity — the maximum gas flow in BTU/hr the regulator must pass. Call us at (901) 458-2000 with these details and we'll identify the right Maxitrol model.
Do you carry Sensus Gas Division regulators?
Yes — Memphis Control Center sources Sensus Gas Division gas pressure regulators by request. Key Sensus series include the 143-80 (domestic and small commercial service regulator, 3/4"–1-1/4" NPT, for burners, unit heaters, and boilers), the 243 (large capacity commercial and industrial regulator, 1-1/4"–2" NPT, for boilers, burners, furnaces, restaurants, hospitals, and gas distribution), the 122 (high capacity industrial combustion regulator, 1"–2-1/2" NPT), and the 121 series for commercial and industrial service line applications. Call us at (901) 458-2000 with your Sensus model number and we'll confirm availability and pricing.
