Wolfgang Mehner GmbH has been an authorized retailer and service partner for the industrial refrigeration program from Parker Hannifin GmbH (Herl + R/S products) since November 26th, 2018 for the regions of Germany, Austria and Switzerland (DACH). Parker products in the field of industrial refrigeration include safety valves, shut-off fittings, protective traps, non-return valves, control valves, solenoid valves and the associated spare parts. The fittings are used in the field of industrial refrigeration, including with the media NH3 and CO2.

PARKER / HERL - Specialist in safety valves in industrial refrigeration systems

The fittings are made of steel and stainless steel with welding ends, flange connections, screw connections and intermediate flanges. A well-assorted storage, according to the requirements of the customers, is a matter of course. Wolfgang Mehner GmbH is a qualified service partner for the repair of safety valves from Parker (Herl).

Quality monitoring is also carried out, if desired, with a TÜV certificate of the response pressure. Here is a small list of the product groups with the associated product names, without claiming to be complete.


Safety valves for industrial refrigeration



Safety valve screwed

  • depending on back pressure
  • Seat 12 mm
  • Connection G1/2" / G1"
  • Valves with weld-on nipples to DN25 available
  • Pressures up to 40 bar


Safety valve flanged

  • depending on back pressure
  • Connection DN15 to DN50
  • Pressures up to 27 bar


Overcurrent safety valve flanged

  • not depending on back pressure
  • with bellows
  • Connection DN25/32
  • Pressures up to 27 bar


Parker/Herl is your specialist for safety valves in industrial refrigeration. The valves are "Made in Germany" and are distributed worldwide.


The Mehner GmbH is a certified service partner for our safety valves in Saxony, Germany. They are authorized to repair our safety valves and to adjust them.

Qualified personnel is guaranteed by regular training.

Customer benefits

  • Valve body in one piece
  • No welds
  • TÜV design
  • GOST certification
  • high relief services
  • available worldwide
  • available also as a safety valve combination
  • TÜV certificate of adjustment
  • 3.1 Material evidence
  • compliance of the directive on pressure equipment 97/23/EG

Product features

  • suitable for gaseous refrigerant according to: EN 378-1 (Appendix E). Bellows also suitable for liquid refrigerant
  • Housing material: Steel or stainless steel
  • Seat seal: Neoprene
  • Temperature: -50 °C to +120 °C
  • Design: According to DIN EN 12284, EN 13136, EN ISO 4126
  • Overall length: EN 558-1 Basic Series 8
  • Flanged valves according to EN 1092 with Groove or according to ANSI 16.5 class 153 or class 300 RF

Valves for industrial refrigeration


Angle shut-off valve



Inlet pressure regulator
Evaporator pressure regulator
Condenser pressure regulator



Automatic air vents



  • Shut-off valves
  • Non-return valves
  • Dirt collector
  • Control valves with actuator
  • Ball valves
  • Butterfly valves

Product features

  • DN15 to DN400
  • Housing made of steel or stainless steel
  • Refrigerant: NH3...
  • TS: -60 °C to +160 °C
  • PS: 28/42/52 bar
  • Conformity PED 97/23/EG

Automatic valves

  • Solenoid valves
  • Inlet pressure regulator
  • Differential pressure regulator
  • Pressure reducer
  • Hot gas bypass regulator
  • connectable non-return valves and dirt collector
  • Float switch

Product features

  • DN15 to DN100
  • Housing GGG40.3
  • Refrigerant: NH3...
  • TS: -50 °C to +105 °C
  • PS: 28 bar
  • Conformity PED 97/23/EG


The automatic purger V200 was developed as unique, energy-saving device in order to remove non-condensable foreign gases of ammonia refrigeration systems efficiently.

Product features

  • plug-and-play
  • compact design
  • corrosion-resistant
  • Only suitable for ammonia
  • Gweight only 34,5 kg
  • Integrated microprocessor
  • Factory calibrated
  • automatic or manual cycle control
  • up to 20 bleeding points
  • automatic pressure adjustment
  • Power-saving mode
  • Voltage 230 V/50 Hz
  • DN15 to DN400
  • Conformity PED 97/23/EG

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