MAXITROL

The Maxitrol 325-3L and 325-5L series are both lever-acting gas pressure regulators with aluminum bodies and NPT x NPT connections. The primary difference is the gas capacity rating and the orifice size. For example, the 325-3L-44-NG01 has a capacity of 250,000 BtuH, while the 325-5L-66-NG01 is rated for 325,000 BtuH. The 325-5L48-66-NG01 is rated for 515,200 BtuH. The series number generally indicates the body size and flow range. Selection depends on the required flow rate and the allowable pressure drop. Both series use the same lever-acting mechanism, but the internal orifice and spring ranges differ. Always verify the specific model's capacity and outlet pressure range against the application requirements.

The 'NG' suffix on Maxitrol part numbers typically indicates a configuration for natural gas service. It may also denote a specific spring range or outlet pressure setting. For example, the 325-5L-66-NG01 is a lever-acting regulator with a 325,000 BtuH capacity, and the 'NG01' suffix identifies the factory-set outlet pressure range and spring. The exact meaning can vary by model, so the manufacturer's specification sheet should be consulted for the precise outlet pressure range and spring color code. When ordering, provide the full part number to ensure the correct configuration is supplied. 3G Electric lists the complete manufacturer part number for each regulator to avoid ambiguity.

Maxitrol 325 series lever-acting regulators are typically designed for natural gas, but some models can be used with LP gas or propane when equipped with the appropriate spring and orifice. The 'NG' suffix usually indicates natural gas, while other suffixes may indicate LP gas configurations. The body material and diaphragm must be compatible with the gas being used. For LP gas, the higher heating value and different specific gravity affect the flow capacity, so the regulator's BtuH rating for LP gas may differ from the natural gas rating. Consult the manufacturer's literature for the specific model's LP gas capacity. 3G Electric supplies the part numbers as listed; buyers should verify compatibility with their gas type and local codes.

The Maxitrol 325-7AL-1010-NG02 is a lever-acting gas pressure regulator with a rated gas capacity of 2,012,500 BtuH. The maximum inlet pressure depends on the specific model and the outlet pressure setting. For the 325 series, typical maximum inlet pressures are in the range of 2 to 5 psi for low-pressure regulators, but some models can handle higher inlet pressures. The exact maximum inlet pressure for the 325-7AL-1010-NG02 should be obtained from the manufacturer's specification sheet. The regulator's aluminum body and NPT x NPT connections are standard for this series. Do not exceed the manufacturer's stated maximum inlet pressure, as it can damage the diaphragm or cause unsafe operation.

To select a Maxitrol regulator for a 400,000 BtuH load, first determine the required outlet pressure and the available inlet pressure. Then choose a model with a gas capacity rating above the load, such as the 325-3L-33-NG01 (402,500 BtuH) or the 325-5L600-88-NG01 (465,000 BtuH). The regulator should be sized so that the pressure drop at the required flow does not fall below the minimum operating differential. Also consider the connection size to match the pipework. The 325 series offers various capacities, so select the model that provides the required flow with a suitable margin. 3G Electric lists the BtuH capacity for each part number to assist in selection. Final selection should be made by a qualified gas engineer.

Maxitrol 325 series lever-acting gas pressure regulators typically have an aluminum body and NPT x NPT threaded connections. The aluminum construction provides a balance of weight and corrosion resistance for indoor gas distribution systems. The NPT threads are standard for gas piping in many regions. Some models may have different body materials or connection types, but the products listed by 3G Electric, such as the 325-5L-66-NG01 and 325-5L48-66-NG01, specify aluminum bodies and NPT x NPT connections. Always confirm the connection size (e.g., 1/2 inch, 3/4 inch, 1 inch) from the part number or specification sheet. The aluminum body is not suitable for all environments; check compatibility with the surrounding atmosphere.