Fisher™ 161AY Series Pilot-Operated Pressure Reducing Regulator
Precision Regulation for Gas and Industrial Pressure Control Systems

The Fisher 161AY Series is a compact, high-performance pilot-operated pressure reducing regulator designed to provide accurate and stable downstream pressure control in a wide range of industrial and fuel gas applications. Manufactured by Emerson under the Fisher™ brand, this series is engineered for systems that require tight pressure regulation, even under fluctuating inlet pressures and varying flow rates.

Its pilot-operated mechanism ensures responsive control with minimal offset, making it ideal for demanding service environments such as fuel gas regulation, process control, and instrumentation supply lines. With a variety of body materials and end connection options available, the 161AY can be configured to suit a broad range of system requirements.

Key Features:

• Pilot-operated design ensures superior pressure stability and sensitivity

• Compact size suitable for limited-space installations

• Compatible with both horizontal and vertical mounting orientations

• Available in aluminum, steel, or stainless steel for varied media compatibility

• Certified options available for ATEX and PED compliance

Technical Specifications:

• Manufacturer / Brand: Emerson / Fisher

• Series / Model: 161AY Series

• Type: Pilot-operated pressure reducing regulator

• Connection Size: 1/4" NPT (typical; other sizes available by model)

• Body Materials: Aluminum, Steel, or Stainless Steel (varies by model and application)

• End Connections: Threaded NPT (standard), Flanged (optional on select models)

• Pressure Rating: Up to 300 psig (20.7 bar)

• Outlet Pressure Range: 0.5 to 150 psig (varies based on internal spring selection)

• Temperature Range: –20°F to 150°F (–29°C to 66°C)

• Flow Capacity: Dependent on orifice size and system inlet pressure

• Operation: Pilot-operated, with downstream sensing for feedback control

• Mounting Orientation: Suitable for both horizontal and vertical installations

• Typical Applications:

  • Fuel gas systems

  • Industrial process gas control

  • Instrument air and gas supply lines

• Certifications (model dependent): PED, ATEX (available upon request or specific configuration)