Model 441-S Natural Gas Pressure Regulator

The Model 441-S natural gas pressure regulator is a large-capacity, low-pressure regulator engineered for applications requiring fast response, high sensitivity, and precise pressure control under heavy load conditions. Featuring large, flexible diaphragms and precisely calibrated springs, the 441-S delivers stable outlet pressure across a wide range of flow rates while maintaining excellent control accuracy.

Designed with rugged construction and proven mechanical reliability, the Model 441-S is well suited for distribution systems, industrial facilities, and monitoring applications where speed and accuracy are critical. Its dependable performance and ability to assume control instantly during abnormal conditions make it a trusted solution for both primary regulation and monitor service.

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Product Documents

Model 441-S Features

  • Large-Capacity Regulator Design: Oversized bodies, valves, and diaphragms support high gas demand while maintaining stable pressure control.

  • Fast Response & High Sensitivity: Quickly reacts to load changes, making it ideal for monitoring and emergency pressure control situations.

  • Balanced Valve Construction: Provides accurate pressure regulation and consistent lock-up performance across varying flow conditions.

  • Wide Diaphragm & Spring Selection: Multiple diaphragm sizes and spring ranges allow precise tuning for specific pressure requirements.

  • Monitor-Ready Without Modification: Can be used as a standby monitor regulator without mechanical changes, simplifying system design.

Benefits

  • Exceptional Monitoring Performance: Assumes control immediately if an operating regulator fails or outlet pressure rises above its set point.

  • Reliable Pressure Control Under Heavy Loads: Maintains precise outlet pressure even in large-capacity, high-demand applications.

  • Enhanced System Safety: Fast response minimizes over-pressurization risk in critical gas systems.

  • Field-Proven Durability: Rugged construction and proven design support long service life in utility and industrial environments.

  • Flexible Application Use: Suitable for both primary regulation and monitor service in distribution and industrial systems.

Capability

The Model 441-S regulator supports demanding low-pressure gas regulation and monitoring applications.

  • Application Types: Gas distribution systems, district regulator sets, industrial gas systems, monitoring installations

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

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

  • Monitoring Use: Designed to operate as a monitor regulator upstream or downstream, quickly assuming control during abnormal conditions

Specifications

Available Models

  • Model 441-S
    Low-pressure, large-capacity regulator available in multiple body and diaphragm configurations

Construction

  • Body Materials: Cast iron, ductile iron, or cast steel (model and flange rating dependent)

  • Diaphragm: Buna-N, fabric-reinforced diaphragms available in multiple sizes for optimal performance

  • Valve & Trim Materials:

    •  Brass or stainless steel stems and orifices

    •  Soft-seat valve options in Buna-N or polyurethane

  • Spring Cage & Internal Components: Heavy-duty construction for stable operation and long service life

Pipe Sizes

  • 2", 3", 4"

Threaded and flanged body options are available depending on size and pressure requirements.

Pressure Ratings

  • Outlet Pressure Range: Low-pressure service (inches water column up to several psi, spring and diaphragm dependent)

  • Maximum Inlet Pressure: Varies by body type and flange rating

    •  Up to 125 psi on threaded bodies

    •  Up to 700+ psi on select flanged steel configurations

  • Operating Temperature Range: -20°F to +150°F

For complete pressure limits, spring ranges, capacity tables, and dimensional data, refer to the product documents above.