Nelson Irrigation Corp. 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: 509.525.7660 Fax: 509.525.7907 E-mail: [email protected] Web site: www.nelsonirrigation.com
MR/MRDC
MDC Guide
TYPICAL APPLICATIONS
4
4.0 TYPICAL APPLICATIONS
4.1 ROTATOR ORCHARD SPRINKLER.
Orchards are commonly planted on
sloping terrain. The MR and MRDC are
useful to deliver equal water top and
bottom. The MRDC is additionally useful
to keep the water in the pipe from draining
to the low area to reduce wet spots in the
low end of the field. The MDC is useful
where pressure regulation is not required
but holding the pipes full of water is
necessary.
4.2 OVERTREE COOLING
The spray of water over apples and other orchard crops is a common practice that can prevent damage
due to heat and sunburn. The check feature of MRDC and the MDC prevents drainage of the system pipes
in-between frequent on-and-off cycles of the cooling irrigation system. The result is more efficient on-off
cooling cycles. Growers like the quick start-up of the sprinklers to rapidly wet the fruit.
4.3 DRIP LINES
The low pressure operation of drip lines requires exact pressure control. Slight variations caused by pump
pressure or elevation can cause undesirable irrigation uniformity. The MR is very useful in controlling the
pressure on the drip line. The MRDC and MDC are useful in keeping the submains full of water.
4.4 ROTATOR FOR WHEEL LINES
The adequate pressure on Rotator sprinklers is essential for uniform irrigation. Wheel lines are commonly
put on undulating land. The pressure can also vary as adjacent wheel lines are turned on and off. In this
condition, the regulator will keep the flow rate the same from each sprinkler (it is essential the minimum
pressure is available).
Save power and water by being accurate in the amount of water out of each device. Caution: The drain-
check feature of the MRDC or MDC is not good for wheel lines because the pipes must be empty in order
to move the wheel lines. Use only the MR on wheel lines because pipe drainage is needed.
4.5 GREEN HOUSE IRRIGATION
The drain check will keep the sprinklers from dripping or draining after shut off and quick start-up.
Same flow top
to bottom
