Pressure Reducing Valves

The valve maintains a preset downstream pressure, regardless of upstream pressure or flow rate fluctuation. The main valve is controlled by a 3-way pilot, allowing full opening when the pressure drops below a downstream pressure set-point.

Features & Benefits

  • Accurate, stable control from no-flow to full-flow.
  • Exceptionally low head losses at high flows.
  • High resistance to corrosive water and other acid media (including 3-way pilot).
  • Simple to install - manufactured with threaded or socket (slip) connections.
  • Simple and reliable design - diaphragm is the only moving component.
    Shaft, seals or bearings are not located within the water's passage way.

Purchase Specifications

  • Hydraulic valve with direct sealing flexible diaphragm.
  • Inline maintenance.
  • Stem, shaft or guide bearing are not located within the water passage.
  • Activated by the line pressure or by an external hydraulic or pneumatic
  • Operated by a pressure reducing pilot valve to achieve constant outlet
    pressure, regardless of upstream pressure or flow variations.
  • Valve and the controls are Netafim Series 61PRXPLS (X is used to signify size
    of valve - 3", 4", 6", etc.).

Quick Sizing

  • Valve size same a line size or one size smaller.
  • Maximum flow speed for continuous operation of 18 ft/sec.

Design Considerations

  • The valve should be suited for the maximal flow and allowed headloss.
  • Large pressure differentials may cause cavitation damage. Consult with Netafim if such conditions are expected.


D[mm] ≤ √(250 x Flow[m3/hr] / √Pressure [mwc])