Fisher 133 Series Pressure Reducing Regulators｜High-Performance Direct-Operated Gas Regulators

Key Benefits and Advantages

• Precision Balancing System: Minimizes the effects of varying inlet pressures, allowing the regulator to provide a constant outlet pressure for optimized burner performance and fuel economy.

• Excellent Shock Characteristics: Engineered to handle the rapid “on/off” cycles of industrial burners without causing pressure spikes or system instability.

• Fast Speed of Response: Responds immediately to changes in downstream demand, ensuring that high-performance combustion equipment receives a steady supply of gas.

• Wide Pressure Range Capability: A single regulator platform can cover a broad spectrum of outlet pressures, reducing the need for extensive spare parts inventory.

• Bubble-Tight Shutoff: Provides a positive seal when the system is idle, preventing pressure build-up in downstream piping and protecting sensitive equipment.

• Minimized Spring and Diaphragm Effects: The design reduces the traditional “droop” found in many direct-operated regulators, resulting in a flatter and more accurate control curve.

• Simplified Maintenance: Features easy access to internal trim parts without removing the entire body from the line. Furthermore, no seat-to-seat adjustment is required, which streamlines the reassembly process.

• Robust Material Options: Available with steel bodies to meet specific safety requirements for high-temperature environments or industrial site standards.

Technical Properties

• Body Sizes: Typically available in NPS 2 / DN 50.

• End Connections: Offered in NPT threaded or flanged (ANSI 125 FF, 150 RF) configurations.

• Specialized Models:

  1. Type 133L: Designed for low-pressure requirements.

  2. Type 133H: Suitable for medium to high-pressure ranges.

  3. Type 133HP: Engineered for the highest pressure settings within the series.

• Monitoring Capability: All models are suitable for use in monitoring systems to provide secondary overpressure protection.

• Inlet Pressure Rating: Capable of handling significant upstream pressures while maintaining sensitive control.

Field of Application

The 133 Series is widely used in facilities where large gas-fired equipment requires high volumes of fuel at a very steady pressure. Its reliability makes it a staple in heat-treating and manufacturing processes.

Primary Industries and Uses:

• Industrial Manufacturing: Gas supply for furnaces, kilns, and ovens.

• Commercial Heating: High-capacity boilers for hospitals, schools, and large office buildings.

• Power Generation: Pilot gas supply and small-scale fuel gas conditioning.

• Metals and Minerals: Smelting and foundry burner control.