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800 Series Flow Control Valves

Prevent water hammer and protect system pipes.

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Control Valves

800 Series Flow Control Valves

800 Series Flow Control Valves
Features

Flow control valves are most commonly used to slow-fill pipelines to prevent water hammer, especially at center pivot points on large pipe networks. They can also be used to limit the flow rate of a valve discharging into a pond, canal, or reservoir.

A Nelson Rate-of-Flow pilot uses a velocity-sensing paddle to limit the system flow rate. The paddle and pilot are installed in the pipe upstream of the valve. For slow-fill applications, the pilot should be set to 110-120% of the design flow. When the valve is first opened, the pilot throttles the valve to prevent high flow water hammer. When the pipeline is full and the design flow is reached, the pilot allows the valve to go fully open.

Available for the following pipe sizes and flow rates:

  • 3" Pipe: 120-400 gpm
  • 4" Pipe: 200-550 gpm
  • 6" Pipe: 350-1,000 gpm / 500-2,000 gpm
  • 8" Pipe: 500-1,550 gpm / 900-3,800 gpm

Can be combined with other control functions, including solenoid on/off, pressure reducing, and pressure sustaining.

Two additional flow control devices are:

  • Shuttle Check: used to prevent flow reversal.
  • Sleeve Exhaust: makes the valve fully open below 10 or 30 psi inlet pressure, used in surge anticipating valves and in deep well applications to divert the initial surge of water from causing a pressure spike in the mainline.
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Please read our Warranty information.

Sprinkler performance data have been obtained under ideal test conditions and may be adversely affected by wind, poor hydraulic entrance conditions, or other factors. Published radius and diameter of throw performance are at nozzle pressure when tested at 1,250 feet above sea level. Your results may differ from the test data results obtained by Nelson Irrigation Corporation and Nelson Irrigation Corporation makes no representation regarding droplet conditions, uniformity, application rate, or fitness for a particular purpose.