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Measurement and Control Technology

Pressure control valves

Our pressure control valves made from PVC, PP or PVDF (other materials available on request) reduce system pressure to a specified level and are available with a nominal diameter of DN10 to DN100. By utilizing the differential pressure, the pressure regulator adjusts to the set operating pressure. The outlet pressure is not directly related to the inlet pressure. The output point acts on the diaphragm surface via a control bore and presses against the set spring force. Once the forces are balanced, the valve closes and therefore keeps the operating pressure constant. If the pressure on the output side drops, it means that the set spring force is greater, in which case the valve opens until the forces are once again balanced.


  • All wetted parts are made from highly resistant plastics
  • Adjusting mechanism is hermetically sealed off from the medium
  • Excellent control properties on account of optimization of pistons, springs and control area
  • No auxiliary power required
  • Largely maintenance-free and easily installed anywhere
  • Diaphragm-protected mechanical or electronic manometer for reading the output pressure
  • Valve can also be adjusted under operating pressure
  • Platform construction with an innovative FCR design
  • Internal areas optimized in terms of fluid power
  • Unbeatably low particle emissions in ultra-pure water

Pressure retention valves and overflow valves

Pressure retention valves are generally used where a constant pressure needs to be maintained in a system. The valve controls the upstream pressure to the set target value. The set spring force presses the piston on to the seal seat. If the system pressure exceeds the value of the operating pressure, the valve opens.

Overflow valves protect pipe systems from overpressure and pressure peaks. There is only minimal pressure loss in the channel on account of the streamlined design of the bottom section with virtually zero dead space. The set spring force presses the diaphragm on to the seal seat. If the system pressure exceeds the value of the operating pressure, the valve opens.

Flow meters

Our flow meters operate on the variable area (rotameter) principle and are used to measure the flow rates in closed pipes. The medium flows through the flow meter vertically; as a result, the float is lifted and shows the flow rate on the attached scale. The reading edge corresponds to the largest diameter of the float.

Our flow meters come equipped as standard with a scale for water (scales for many other media can be supplied) and 2 mechanical target value indicators (electronic transmitters can be supplied).

Special fittings

Röchling Medical Waldachtal AG supplies special fittings such as

  • Diaphragm seals for decoupling the working fluid and the pressure meter
  • Water jet pumps for mixing and withdrawing fluids
  • Restrictor sleeves for manually adjusting fluid volumes
  • Venting and bleeding valves for automatically venting and bleeding pipes
  • Float valves for automatically controlling the flow into tanks and containers

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System solutions and components for Diagnostics, Fluid Management, Pharma and Surgery