• Dutco Tennant LLC, PO Box 233, Dubai, U.A.E.
Pilot Operated - Ductile Iron Plumbing Products


A compactly designed steam system produces clean dry steam in the boiler house that is ready for delivering high pressure through the distribution network. The potential for generating and supplying high quality saturated steam at the lowest overall cost gets maximized by this. The needs are different at point of use, however. Low steam can offer a wide range of advantages here as the design of the equipment and its construction can because of lower pressure rating cost less to buy, as the flash steam loss is reduced can cost less to operate, suffer fewer scaling problems due to lower steam temperature.

The pilot operated a reducing valve, works in a way such that it balances the downstream pressures against a control spring. A small valve plug over a seat (the pilot) gets modulated by this. In turn to the main valve diaphragm, where it modulates the main valve, the flow through this seat is directed. Under steady load conditions, the force set on the adjustment spring gets balanced by the pressure under the pilot diaphragm. The pilot valve thus gets sets and makes way for a constant flow across the main diaphragm. It is also ensured that the main valve is also settled to make way for stable downstream pressure. The pilot valve closes, and pressure is released from the main valve diaphragm through the control orifice, when the downstream pressure rises, to close the main valve. The pilot diaphragm immediately senses any variations in load or pressure which act as to adjust the position of the main valve and ensures a constant downstream pressure. The use of an external pressure sensing pipe is recommended for achieving the stable operating conditions, importantly when the valve is nearly used in its maximum capacity or under critical flow conditions.

Benefits -

  • Reduced installation costs as no external power source are required
  • Reduces total control investment  - Pressure and temperature control valve combinations
  • Accurate control of pressure for constant process temperatures improves process efficiency and product quality
  • Reduces spares stocking costs due to interchangeability of many spares
  • Intrinsically safe as standard, for use in hazardous areas

From Dutco Tennant LLC get the most advanced range of Pilot Operated Pressure Reducing Valves for all your plumbing projects.

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  • Automatic Control Valve
  • Suitable for potable water applications
  • Pressure Adjusted by Integral Pilot Valve
  • Conforms to BS EN 558-1 Series 10
  • Flange Conforms to BS EN 1092 PN16
  • Available flanged PN25
Max Pressure 16 Bar
Working Temperature 0°C to +80°C

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