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Shand & Jurs 97177 Double Port Pressure Regulator

Modulating Low-Pressure Gas Regulator

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Shand & Jurs 97177 Double Port Pressure Regulator

For biogas engineers, utility-fuel specialists, and burner-train designers, the Shand & Jurs Biogas 97177 Double Port Pressure Regulator delivers steady downstream pressure as demand changes across flares, burners, and fuel-gas equipment at wastewater and landfill sites.

Unlike single-seat regulators that throttle at higher flow and swing pressure when consumption shifts, the 97177 uses opposing balanced seats so outlet pressure stays stable while the valve passes greater capacity at comparable settings.

A large sensing diaphragm responds to actual demand rather than local turbulence, and the regulator can be reconfigured in the field as either a pressure-reducing downstream regulator or a back pressure upstream regulator to suit the application.

Rated for 2 PSIG inlet pressure and up to 20″ W.C. outlet control across 2″–12″ flanged sizes in cast aluminum, the 97177 modulates fuel-gas supply to burners, boilers, heat exchangers, and flare systems without cycling the line.

Shand & Jurs 97177 Double Port Pressure Regulator
Shand & Jurs 97177 Double Port Pressure Regulator
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Features

Dual Balanced Valve Seats

Opposing seats cancel diaphragm forces, passing higher flow at low pressure while holding control accuracy tighter than single-seat regulators at comparable settings.

Large Sensing Diaphragm

Oversized diaphragm responds to true demand changes rather than local turbulence, eliminating pressure oscillation and unstable operation during varying gas production or consumption.

Continuous Modulation

Valve position adjusts smoothly as downstream demand shifts rather than cycling fully open and closed, preventing flame instability and nuisance burner shutdowns.

Reconfigurable Regulator Mode

Configurable in the field as a downstream pressure-reducing regulator or upstream back pressure regulator, matching one body to multiple gas-handling duties on-site.

Adjustable Spring Setpoint

Spring-loaded setpoint allows precise in-service tuning of operating pressure, supporting commissioning and rebalancing without removing the regulator from the gas train.

Serviceable Cast Aluminum Body

Corrosion-resistant cast aluminum with accessible internal assembly enables cleaning and rebuild in wet gas and condensate environments typical of biogas duty.

Applications

  • Fuel Gas Headers: Maintains stable supply pressure across distribution headers feeding multiple burners and utility consumers drawing varying flow from a shared low-pressure network.
  • Burner Trains: Delivers steady fuel gas to process burners and pilots so combustion stays stable under modulation, avoiding relight cycles and incomplete burn during demand swings.
  • Flare Systems: Regulates supply feeding waste gas flares, preventing pressure swings that destabilize the flame or cause nuisance shutdowns during landfill or digester production variation.
  • Digesters: Handles pulsing output from anaerobic digesters, passing higher flow at low pressure while stabilizing downstream header pressure for utilization and treatment equipment.
  • Landfills: Regulates extraction-field output where well-field pressure varies with operations, feeding downstream treatment, flares, and gas-to-energy equipment reliably.
  • Utility Gas Networks: Controls pressure across plant utility fuel distribution where multiple consumers cycle, preserving stable delivery instead of oscillating with header load.
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Specifications

Parameter

Specification

Operating Function

Downstream Pressure Regulator (configurable as back pressure regulator)

Typical Control Range

±3″ W.C. of factory set, up to 20″ W.C. maximum

Maximum Inlet Pressure

2 PSIG

Line Sizes

2″ – 12″

Connection

150 lb. ANSI FF Flange

Body Material

Cast Aluminum

Seat

Aluminum / Stainless (size dependent)

Diaphragm

Reinforced Elastomer

Spring

Stainless Steel

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2026 COST ESTIMATE

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If you have questions not covered here, please contact the Cognesense support team for assistance.

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Why choose a double-port regulator over a single-seat design?

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Opposing balanced seats cancel diaphragm forces, so the 97177 passes greater flow at the same low setpoint without pressure droop. Single-seat regulators begin throttling sooner and swing outlet pressure as demand shifts.

Can the 97177 be used as either a reducing or back pressure regulator?

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Yes. The valve can be configured as a downstream pressure-reducing regulator to maintain constant outlet pressure, or as a backpressure upstream regulator to maintain a controlled feed pressure. Configuration is selected to match the application.

What inlet and outlet pressures does the 97177 handle?

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Maximum inlet pressure is 2 PSIG. Typical control range is ±3″ W.C. of the factory set point with a maximum of 20″ W.C. outlet. Line sizes are 2″–12″ with 150 lb. ANSI FF flange connections.

Is it suitable for wet biogas service?

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Yes. The cast aluminum body, stainless steel spring, and reinforced-elastomer diaphragm handle wet gas and condensate typical of digester and landfill service. The internal assembly is serviceable, so fouling can be cleaned in the field.

Does the 97177 require external control instrumentation?

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No. The regulator is self-contained — the large sensing diaphragm responds directly to downstream demand and modulates the valve continuously. No external transmitter, controller, or power supply is required for steady pressure control.

How does continuous modulation reduce operating cost?

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Continuous modulation prevents cycling between fully open and closed, which keeps burners and flares stable, reduces blower energy consumption, and avoids the fuel waste and nuisance shutdowns that come with oscillating supply pressure.

Summary

With over a century of tank-safety heritage inside Cognesense, the Shand & Jurs Biogas 97177 Double Port Pressure Regulator is chosen where low-pressure gas trains must deliver steady pressure across changing demand. Its balanced opposing seats pass higher capacity than single-seat regulators, its large diaphragm responds to real demand rather than local turbulence, and its continuous modulation keeps burners and flares stable. Used as primary fuel-gas control, it is trusted wherever you need to measure, monitor, and protect what matters most.

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Measure.
Monitor.
Protect.