The SR Series provides an economical means of flame staging where infinite modulation is not required. Turn down on low fire is from 25% to 75% of high fire — flow rates to 1,000 CFH.

When vented to the outdoors the 325 Series is suitable for multi-poise mounting. When using the vent limiting device, the regulator (325-3, 325-5A) must be mounted in a horizontal upright position.

The R & RS regulators are for main burner and pilot load applications. Ideal for use with infrared heaters and pilot lines on large industrial heaters and bakers. May also be used in residential applications.

Maxitrol's 325 Series regulators are for 2 psi and 5 psi piping systems. Models available for appliance main burner or pilot applications and as line pressure regulators.

The 220 Series, utilizing a servo-operated design rather than the more conventional spring-loaded design, delivers higher outlet pressure than spring loaded models.

The poppet model RV Series is designed primarily for main burner and pilot load applications. They are available from 1/8" to 3/4" pipe size and rated for up to 1/2 psi (35 mbar).

Maxitrol's original straight-thru-flow design regulators are main burner only, non-lockup type. Typical applications include residential, commercial, and industrial gas-fired appliances and equipment used on low pressure gas supply.

Maxitrol Zero Governor model regulators are used for flow control of burners, nozzle mixers, mixing tees and proportional premixers.

BRR - Balanced Ratio Regulators are designed to provide accurate air/fuel ratio control of cross-connected combustion systems. The delivery pressure of the BRR will match that of the cross-connected signal being applied to the upper diaphragm chamber.

Balanced Zero Regulators feature a rugged, large diaphragm actuated valve assembly, sensitively balanced at near zero pressure. Gas flow is initiated by a very small pressure differential across the main diaphragm.

FCR - Flow Control Regulators are double diaphragm spring balanced flow ratio control regulators that offer maximum control and fuel efficiency on gas-fired applications involving preheated air to the burners, or where burners fire against a varying back pressure.

BZR-B is designed with an adjustable compensation spring to bias the regulator providing a smooth transition to excess air operation at low fire, Using a gas adjuster downstream of a negative biased regulator.

PCR - Pilot Control Regulators are the oil or dual-fuel versions of the FCR regulators (Bulletin 5105) and offer maximum control and fuel efficiency on oil or dual-fuel applications involving preheated air to the burners, or where burners fire against a varying back pressure.

BZR-B is designed with an adjustable compensation spring to bias the regulator providing a smooth transition to excess air operation at low fire, Using a gas adjuster downstream of a negative biased regulator.

BRR-300 -- Balanced Ratio Regulators are designed to provide accurate air/fuel ratio control of cross-connected combustion systems. The delivery pressure of the BRR-300 will match that of the cross-connected signal being applied to the upper diaphragm chamber

The SR Series Pressure Reducing Regulator is designed for industrial furnaces and heating applications. These regulators will maintain a constant outlet pressure over a wide range of flows even if the inlet pressure varies.

SB Relief Regulators are versatile - offering fast, positive response service for air, all types of gas fuels, and inert gas applications. They may be used as bypass valves in automatic safety systems.

SRB Combination Reducing - Relief Regulators serve a dual function. They relieve upstream pressure while at the same time controlling downstream pressure.

AR Air Regulators in multiple burner systems hold constant airfuel ratio and mixture pressure with reducing burner port area of up to 90%. Used in the air line, the top main diaphragm chamber is referenced through a bleed loader set for the desired burner mixture pressure.

Pyronics, Inc. Does not recommend field repairs of 5201-SR Regulators. It is extremely difficult to get the same setting in the field as opposed to a factory built or rebuilt unit. In addition, there is a possibility of the regulator being assembled in an improper manner which could create a hazardous condition.

Oil-Air Ratio Regulators are used to proportion fuel flows to modulating oil burners. Combustion air flows produce a proportional pressure signal that is applied to the regulator to set the outlet oil pressure.