GESTRA BK45 Steam Trap is a premium industrial valve from the German GESTRA brand, designed for high-pressure steam systems. As a bimetallic thermostatic steam trap, it uses a Thermovit regulator to provide rapid response, condensate discharge without steam loss, and air venting. It is suitable for steam piping and heat exchangers in the chemical, power generation, food processing, and other industries, helping improve system efficiency and reduce energy consumption. The BK45 series offers high-pressure and corrosion resistance, flexible installation, and dependable steam system maintenance.

Product Overview

GESTRA BK45 uses stainless steel bimetallic plates and a staged nozzle mechanism to ensure full-open discharge of condensate and air during startup. As the temperature rises to approximately 15 K below saturation temperature, the valve port closes immediately to prevent steam leakage. The valve complies with the European Pressure Equipment Directive (PED) and ATEX explosion protection standards and is suitable for Group 2 fluids. Compared with conventional steam traps, BK45 provides faster response and tighter shutoff, minimizing energy waste.

• Key advantages:

Fast response: The bimetallic regulator opens and closes rapidly, delivering excellent startup performance.

• High-pressure durability: Withstands a maximum differential pressure of 22 bar and is suitable for demanding conditions such as water hammer.

• Zero steam loss: The tight-shutoff design prevents leakage from the steam system and improves energy utilization.

• Air venting function: Automatically removes air during startup and operation to improve system stability.

• Easy maintenance: Includes an integral strainer that only requires periodic cleaning; no special maintenance is required.

For additional technical details, refer to the GESTRA official product datasheet PDF.

Technical Specifications

The BK45 series offers a comprehensive range of specifications, connection types, and sizes to meet different industrial requirements. Key parameters based on the PN 40 standard are listed below:

Parameter	Specification
Nominal diameter (DN)	15, 20, 25 (1/2”, 3/4”, 1”)
Pressure rating	PN 40 (EN 1092-1 B1); ASME B 16.5 Class 150/300
Maximum differential pressure	22 bar (BK45/BK45-U); suitable for saturated steam temperature
Connections	- Flanged: EN 1092-1 B1 PN 40 / ASME B 16.5 RF - Weld ends: Butt welding (EN 12627/ASME B 16.25) / Socket welding (ASME B 16.11 Class 3000) - Threaded: ISO 228-1 (BSP) / ASME B 16.11 (NPT)
Materials	- Body/cover: 1.0460 / SA 105 (cast steel) - Internal components: Stainless steel bimetallic plates, high-strength steel - BK45-LT variant: SA350 LF2 (low-temperature steel)
Example dimensions (flanged ends, PN 40)	- DN 15: flange Ø 95 mm, length 150 mm, weight 3.7 kg - DN 20: flange Ø 105 mm, length 150 mm, weight 4.3 kg - DN 25: flange Ø 115 mm, length 160 mm, weight 4.8 kg
Operating media	Steam, condensate, air (Group 2 fluids); corrosion-resistant design considering chemical effects

Download detailed specifications: GESTRA BK45 datasheet.

Applications

GESTRA BK45 steam traps are widely used in high-pressure steam systems, including:

• Steam pipeline drainage: Efficiently discharges condensate to prevent water hammer and corrosion.

• Heat exchangers and compressors: Provides real-time air venting to ensure smooth system startup.

• Industrial heating processes: Optimizes energy efficiency in applications such as textile, paper, and pharmaceutical production.

• Special variants: BK45-U is used for applications requiring 30 K subcooling; BK45-LT is suitable for low-temperature environments; BK46 is the reinforced version for higher differential pressure.

When used in potentially explosive areas, ensure electrostatic protection in accordance with the ATEX Directive. See the GESTRA product overview PDF for additional application examples.

Installation and Maintenance Guide

Installation Guidelines

• Position requirements: Can be installed in any position, but the cover should face upward on horizontal piping. Ensure the flow arrow points in the correct direction and that the piping is clean and free of contaminants.

• Preparation: Drain the system, remove sealing plugs, and wear protective equipment, including gloves and safety goggles.

• Connection: Use a torque wrench for fastening. Installing a strainer upstream is recommended to prevent blockage.

• Safety precautions: Operate only when the system is depressurized and cool to avoid overpressure risks.

Download the complete GESTRA BK45 installation and operating instructions PDF.

Maintenance and Troubleshooting

• Routine maintenance: Clean with fresh water and a lint-free cloth. Inspect the strainer and replace the Thermovit regulator annually (torque 90 Nm).

• Common faults:

Steam leakage: Clean or replace the regulator or strainer.

• Insufficient discharge: Check valve opening and pipe slope, or upgrade to a larger valve size.

• Equipment remains cold: Open the isolation valve and clean the piping.

• Recommended accessories: Optional VAPOPHONE® ultrasonic testing equipment or a continuous monitoring module.

For maintenance details, refer to the installation and operating instructions PDF above.

Why Choose GESTRA BK45?

As a global steam control specialist, GESTRA BK45 combines German engineering with an innovative design to provide long-term reliability. Compared with competing products, it delivers faster response and greater durability in high-pressure environments, helping users save 10-20% in energy costs. Contact a professional supplier to optimize your steam system.

Official product page: GESTRA BK45 series details