Model 461-S Natural Gas Pressure Regulator

The Model 461-S natural gas pressure regulator is a balanced-valve, spring-operated regulator designed for distribution and industrial applications that require higher capacity than single-seat regulators, without stepping up to large 2″ balanced-valve designs. With a simple, rugged construction and fast response characteristics, the 461-S delivers stable, sensitive pressure control across a wide range of load conditions.

Featuring contoured internal flow passages and large exit areas, the 461-S minimizes turbulence while maximizing capacity. Its dependable performance, ease of adjustment, and proven mechanical design make it a trusted solution for both primary regulation and monitoring service in utility and industrial gas systems.

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Product Documents

Model 461-S Features

  • Balanced-Valve Design: Permits higher inlet pressures while maintaining stable, accurate outlet pressure control.

  • Large-Capacity Flow Paths: Contoured body passages and large exit areas reduce turbulence and support higher flow rates.

  • Fast, Stable Response: Sensitive diaphragm and calibrated springs provide quick reaction to changing load conditions.

  • Interchangeable Valve Assemblies: Single-seat or double-seat balanced valve options allow flexibility in performance and turndown.

  • Rugged Construction: Available with cast iron or aluminum diaphragm cases and heavy-duty internal components for long service life.

  • Service-Friendly Design: Side inspection plates and accessible internals simplify inspection, adjustment, and maintenance.

Benefits

  • Reliable Pressure Control Across Varying Loads: Maintains consistent outlet pressure in distribution and industrial environments.

  • Ideal Mid-Range Capacity Solution: Bridges the gap between small single-seat regulators and larger balanced-valve designs.

  • Enhanced System Safety: Balanced valve construction reduces sensitivity to inlet pressure changes.

  • Reduced Downtime: Simple mechanical design and interchangeable components streamline field servicing.

  • Versatile Operating Modes: Suitable for primary regulation, monitoring service, and zero-governor applications.

Capability

The Model 461-S regulator family supports a wide range of low-pressure gas regulation applications.

  • Inlet Pressure: Up to 175 psi (model, diaphragm size, and configuration dependent)

  • Outlet Pressure Range: 0 to 10 psi (spring dependent)

  • Pipe Size: 2" NPT or flanged configurations

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

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

The 461-S is especially effective as a monitor regulator, quickly assuming control if an upstream regulator fails and outlet pressure exceeds its set point.

Specifications

Available Models

  • 461-S – Cast iron diaphragm case

  • 461-8S – Aluminum diaphragm case with 8½″ diaphragm

  • 461-12S – Aluminum diaphragm case with 12″ diaphragm

All models share common internal valve assemblies and operating principles.

Construction

  • Body Materials: Cast iron, ductile iron, or cast steel (threaded or flanged)

  • Diaphragm: Buna-N with nylon fabric reinforcement

  • Diaphragm Case: Cast iron or aluminum (model dependent)

  • Valve Trim Options:

    •  Buna-N or polyurethane soft seats

    •  Brass or stainless steel stems and orifices

Pressure Ratings

  • Maximum Inlet Pressure: Up to 175 psi (configuration dependent)

  • Maximum Body Working Pressure: Up to 720 psi (flanged steel bodies)

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

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