Nelson 800 Series Handleiding

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Nelson Irrigation Corporation848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: 509.525.7660 Fax: 509.525.7907 info@nelsonirrigation.com www.nelsonirrigation.com

12/8/20

RATE OF FLOW INSTALLATION

PLUMBING REQUIREMENTS

REMOTE MOUNT INSTALLATION

• A straight length of pipe five pipe diameters long helps take out turbulence and will improve

valve performance. See Figure 1. Excessive turbulence caused by fittings, pipe size changes,

flow meters, and/or pumps immediately upstream of the valve can have a negative impact

on valve performance or even damage the flow-sensing paddle.

• Do not mount the pilot downstream of the valve.

• For applications where the pilot will not fit upstream of the valve, an after-market, in-valve

model is available (6” and 8” valves only). Contact factory for details.

• The rate-of-flow pilot is intended to be installed in steel pipe. If attempting to install in PVC

pipe, be cautious of saddles or fittings that will prevent the paddle from moving freely or be-

ing entirely inserted into the flow path. This may cause the valve to regulate at a flow rate

that is dierent than the indicated value on the pilot calibration stem.

• The rate-of-flow pilot is not intended to replace a flowmeter; having a flowmeter nearby will

assist in setting the pilot.

• Install continuous acting air vents upstream of the rate-of-flow valve to prevent air entrap-

ment and water hammer.

5D

1/3

2/3

VALVE

FLOW

Figure 1. Five pipe diameters upstream are required for best perfomance.

Product specificaties