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
DESIGN CONSIDERATIONS
7
5.5 DESIGN CONSIDERATIONS
OF PRESSURE REGULATOR CONTROL
You can use the pressure regulator for doing a better job
of irrigation. Examine the design pressure and elevation to
decide if regulators are needed. Look at uneven topography
to decide if there is an advantage in reducing runoff caused
by slope and draining of pipes. Regulators can be used
under any condition but the purpose is gained by regulating
the flow. Notice that if conditions are above the diagonal
line on the graph then be certain to use pressure regulators.
If adequate pressure is available then the regulator works
otherwise it remains open.
Consider the savings for lower demand on pump power
because of the reduced initial start-up flow surge. Some
power rates are based upon the peak power demand.
Keeping the pipe full will reduce the time of pumping to fill
empty lines. The peak power is also reduced resulting in
lower power charges.
5.6 FLOW LIMITS
Don’t use the mini-regulator for more than 5 GPM flow. The maximum flow through the regulator depends
upon the acceptable pressure that can be burned up across the regulator. Always maintain 5 psi above the
nominal pressure and keep the flow rate at 5 GPM or lower.
5.7 FILTRATION REQUIREMENTS
The regulator has small openings in the seat and plunger area. Debris smaller than 0.08” (1/16”) may
easily pass through the regulator. Larger material and stringy fibers (such as snail shells) can plug inside
the regulator seat area. Access to remove the plug is gained through the inlet of the regulator.
