BOCK open type vehicle compressors FK40 for mobile applications

Vehicle compressors for mobile cooling

BOCK FK compressors: Market leader with tradition and innovation

BOCK vehicle compressors of the FK series are the result of decades of experience and innovation. Designed for use in bus and rail air conditioning as well as transport refrigeration and market leader in the field of vehicle compressors worldwide. Particularly noteworthy is the BOCK FK40, which looks back on a long career. Since the beginning of its development, it has fulfilled the high quality requirements that are crucial for efficient air conditioning and cooling.

The BOCK FK40 stands for innovation: over the years, the entire series has been constantly further developed and adapted to the requirements of new refrigerants and areas of application.

 Cooling Application

  • Bus and train air conditioning
  • Transport cooling for trucks


vehicle compressor FK

Product Quick-Check

vehicle compressor FK40
  1. Wear-resistant and durable power unit
  2. Forged aluminium connecting rods for maximum stability and robustness
  3. Oil pump lubrication independent of direction of rotation for reliability and durability
  4. Integrated oil collection system with large storage volume
  5. Special valve plate systems for bus and transport cooling



BOCK open type vehicle compressors FK40 for mobile applications

With the most powerful version FK40/755, BOCK offers its customers 15 % more power with the same external dimensions. BOCK vehicle compressors are equipped with the K valve plate system as standard. They are ideally suited for bus air conditioning with increased cooling power requirements in city-, intercity and articulated buses or in areas with very warm ambient temperatures.

Compact lightweight
  • Optimised heat dissipation due to ribbed surface
  • Efficient over the entire speed range


Robust and powerful
  • Robust crankshaft design with roller bearings on both sides: works extremely reliably and with high speed stability
  • Split screwed aluminium connecting rods: stable and robust, thus easy to handle

  • Reliable pressure lubrication with powerful oil pump independent of direction of rotation

  • Extremely low wear, thus extremely durable

  • Valve plate systems specially adapted to the field of application

valve plate K FK 40
Valve plate: K-design

Unique FK valve plate system specially developed for bus air-conditioning

  • Valve plate made of aluminium
  • Working valves made of high-quality, impact-resistant spring steel
  • Extremely robust and reliable in the face of speed and pressure fluctuations as well as exposure to liquids
  • Long service life due to loosely guided annular discs which prevent bending and torsional forces
  • Highest operational safety and efficiency


Valve Plate N FK compressor
Valve plate: N-design

Cost-effective and simple alternative to the K version

  • For universal use in mobile applications
  • Lamellas clamped on one side, which are exposed to bending and torsional forces; therefore limited load-bearing capacity at  high speed and exposure to liquids
Low-temperature valve plate
Low temperature valve plate vehicle compressor

Valve plate TK version for low evaporating temperatures

  • Special version for low-temperature cooling
  • Based on the basic N valve plate concept
  • With additional measures to optimize the degree of delivery at low evaporating temperatures
  • Piston heads provided with grooves in the suction lamella contour: for further minimization of damage space and increased performance in the low-temperature range

vehicle compressor range and performance includes

3 sizes and 11 displacements

Displacements vehicle compressors

BOCK F-Series - new F76 and optimized F88 series

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