Pressure-reducing valves

Product information

Pressure-reducing valves or pressure-regulating valves continuously reduce or increase the process pressure in relation to the pre-set value. The aim is to keep the pressure as constant as possible. We supply pressure-reducing valves that are activated by a control line and valves that are fully self-steering. The valve opens and closes linearly once the maximum or minimum pressure level is exceeded. These valves are suitable for steam, compressed air, water and neutral gases. 

The self-steering valves (types PRV and VD) are fitted with a spring that reacts directly to pressure differences within the valve. The valves with control line (type M) react indirectly, because the medium exerts pressure on the diaphragm via the control line. The diaphragm reacts to these pressure differences by opening or closing in response to a change in pressure.  



  • Range: DN8 to DN200 
  • Pressure: 0 barg to 40 barg (PN10-PN40 / 150 lbs. – 300 lbs.)  
  • Temperature: -30⁰C to 250⁰C 
  • Design: 1-piece or 2-piece casing 
  • Tightness: bi-directional tightness, bubble tight (EN 12266-A) 
  • Casing material: cast iron, steel, stainless steel  
  • Sealing material: EPDM, NBR, PEEK, PTFE, PTFE graphite  
  • Exotic materials possible: yes 
  • Operated by external control line (type M) or fully self-regulating (types PRV and VD) 


When the downstream demand increases, the downstream pressure will decrease. This will decrease the pressure on the diaphragm or on the valve spring and opens the regulator further to allow more flow. When the downstream demand decreases, the downstream pressure will increase. In that case, the regulating element allows less flow to pass in order to lower the pressure in the system. When the line is completely filled and the pressure exceeds the pre-set value, the valve will close to maintain the pressure. 

Product request

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