GESTRA BW 31 / 31A

BW 31, BW 31A PN 40 / Class 150, DN 15 – 25 PN 25 / Class 150, DN 40
Return-Temperature Control Valve

GESTRA BW 31 / 31A Return-Temperature Control Valve
GESTRA BW 31 / 31A Return-Temperature Control Valve
GESTRA BW 31 / 31A Return-Temperature Control Valve

GESTRA BW 31 / 31A Return-Temperature Control Valve

BW 31, BW 31A PN 40 / Class 150, DN 15 – 25 PN 25 / Class 150, DN 40

The GESTRA BW series (Kalorimat) are self‑acting return temperature control valves that regulate the return temperature of a heating circuit.

The valve ensures that fluid (hot water or thermal oil) returns from consumers only when it has cooled below a predetermined “closing temperature.” Above that threshold, the valve restricts the return flow, thereby maintaining a stable return temperature and protecting upstream equipment.

There are two principal variants:

  • BW 31: optimized for hot water heating systems

  • BW 31A: for thermal oil applications, capable of higher operating temperatures

  • Easy and stable extension of heating systems
  • Prevents overheating or under heating
  • Integral quick acting thermostatic regulator, no external sensor required
  • Directly controlled, pilot flow operated
  • Compact design, standard face-to-face dimensions
Parameter BW 31 BW 31A
Medium handled Hot water systems Thermal oil systems
Nominal diameters (DN) DN 15 – DN 40 DN 15 – DN 40
Pressure ratings PN 25 / PN 40 (Class 150) Similar ranges, able for higher temperature operation
Temperature range Adjustable ~20 °C to ~130 °C (depending on DN) Adjustable ~100 °C to ~270 °C (depending on DN)
Differential pressure (ΔP) allowable ~6 bar in many sizes Similar pressure limits
Material Steel body (EN 1.0460 / ASTM equivalent) Same material base
Connection types Flangings (DIN PN, ANSI) / screwed sockets Same types

GESTRA BW 31 / 31A

BW 31, BW 31A PN 40 / Class 150, DN 15 – 25 PN 25 / Class 150, DN 40
Return-Temperature Control Valve

GESTRA: The Ultimate Solution for Industrial Steam & Fluid Control Systems

The GESTRA BW 31 and BW 31A Return-Temperature Control Valves are specifically designed to control condensate return temperature in steam and condensate systems, ensuring energy efficiency, system protection, and stable operation.

With German engineering precision, GESTRA BW control valves automatically regulate condensate temperature before it returns to the boiler, preventing thermal stress, cavitation, and system damage.

For industrial facilities focused on efficiency, safety, and long-term reliability, GESTRA BW 31 / BW 31A are the proven industry standard.

✅ Optimized Condensate Temperature Control

The BW 31 and BW 31A valves ensure precise temperature regulation, protecting boilers and downstream equipment from excessive thermal shock.

✅ Improved Energy Efficiency

By controlling condensate return temperature, these valves help maximize heat recovery and reduce overall energy consumption.

✅ Robust Industrial Design

Manufactured from high-quality materials, GESTRA BW valves offer long service life even in demanding steam applications.

✅ Maintenance-Friendly Operation

Simple construction and reliable performance result in low maintenance requirements and reduced downtime.

The GESTRA BW 31 is designed for standard condensate return systems, delivering stable and reliable temperature control.

Key Features:

  • Automatic condensate temperature regulation

  • Protects boilers from thermal stress

  • Enhances system efficiency

  • Suitable for industrial steam systems

Typical Applications:

  • Steam and condensate return lines

  • Boiler feedwater systems

  • Heat exchanger installations

The GESTRA BW 31A offers enhanced performance for applications requiring greater durability and higher operational demands.

Key Advantages:

  • Improved resistance to pressure and temperature fluctuations

  • Reliable performance in heavy-duty applications

  • Long operational lifespan

  • Optimized for continuous industrial use

  • Industrial steam systems

  • Condensate return networks

  • Power generation plants

  • Oil & gas facilities

  • Chemical and petrochemical industries

  • Food & beverage processing plants

  • Precise temperature regulation

  • Increased boiler protection

  • Reduced risk of cavitation and corrosion

  • Enhanced heat recovery

  • Low operating and maintenance costs

  • Proven GESTRA quality and reliability

Choosing original GESTRA BW 31 / BW 31A Return-Temperature Control Valves ensures:

✔ Manufacturer-certified quality
✔ Compliance with international industrial standards
✔ Reliable and safe system operation
✔ Long-term cost efficiency

⚠️ Non-original valves may compromise temperature control accuracy and system safety.

What is the function of the GESTRA BW 31 / BW 31A?

They control the temperature of condensate returning to the boiler, ensuring safe and efficient system operation.

What is the difference between BW 31 and BW 31A?

The BW 31A is designed for more demanding industrial conditions, offering enhanced durability and performance.

Are these valves suitable for continuous operation?

Yes. Both BW 31 and BW 31A are engineered for continuous industrial use.

Can GESTRA BW valves improve energy efficiency?

Absolutely. Proper condensate temperature control helps maximize heat recovery and reduce energy losses.

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