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.
Product Documents
Specifications
Available Models
- 461-S – Cast iron diaphragm case, available with a 8½″ or 12" diaphragm
- 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.
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.
Talk to an Industrial Gas Control Expert
Whether you’re specifying industrial gas regulators, selecting industrial relief valves, or upgrading critical gas infrastructure, we can help you identify the right solution for your application.
