Nelson MR User manual

Nelson Irrigation Corp. 848 Airport Rd. Walla Walla, WA 99362-2271 U A Tel: [phone] Fax: [phone] E-mail: [e-mail] Web site: www.nelsonirrigation.com
MINI REGULATOR &
MINI REGULATOR DRAIN CHECK
MRDC APPLICATIONS:
1Portable irrigation systems, to
eliminate crop wash out from
partially pressurized sprinklers
during system start up and shut
down.
2 Overhead cooling of apples
and other crops, to prevent
drainage of the system in between
frequent on and off cycles of the
irrigation system.
3Green house irrigation sys-
tems, where sprinkler dripping or
drainage after shut down cannot
be tolerated.
4 Systems where pressure gains
or losses are high due to
uneven topography or high
friction loss in pipes, to ensure
high uniformity and even flow of
all sprinklers in a system.
12
34
MRDC-2
MR MRDC
MINI REGULATOR (MR)
For accurate Pressure Regulation.
Identified with a Gray Inlet.
MINI REGULATOR
DRAIN CHECK (MRDC)
The patented Mini Regulator
Drain Check (MRDC is a
combination pressure regulator
and check valve that provides a
check feature to prevent system
drain down through the sprinkler.
Identified with a Blue Inlet.
OUTLET
Direct Connection
to Rotator Sprinklers
INLET
1/2 FNPT (1.25 cm)
or Female Acme Inlet
MR & MRDC
PRESSURE OPTIONS:
20 PSI (1.4 BAR); 30 PSI (2.0 BAR)
35 PSI (2.4 BAR); 40 PSI (2.8 BAR)
45 PSI (3.1 BAR); 50 PSI (3.4 BAR)
FLOW RANGE:
0.5 - 5 GPM (1.8-18.9 LPM)
R2000 ROTATOR®
WITH MINI REGULATOR

SPECIAL WARNINGS!
1. Always maintain a minimum of 5 PSI above the nominal pressure rating to
avoid severe distortion of sprinkler distribution patterns and decreased flow.
2. emove the M DC and drain the irrigation system during freezing conditions
to prevent damage to the M DC and the irrigation system. THIS P ODUCT
IS NOT ECOMMENDED FO USE IN F EEZING CONDITIONS.
3. Partial plugging of the M DC inlet can cause severe distortion of distribution
patterns and decreased flow.
4. The maximum inlet pressure is 150 PSI.
5. This product requires flow through it to regulate pressure. IT IS NOT FO
USE IN CONTINUOUSLY STATIC CONDITIONS.
Nelson Irrigation Corp. 848 Airport Rd. Walla Walla, WA 99362-2271 U A Tel: [phone] Fax: [phone] E-mail: [e-mail] Web site: www.nelsonirrigation.com
MINI REGULATOR/MINI REGULATOR DRAIN CHECK
8/03
WARRANTY AND DISCLAIMER: The Nelson Mini Regulator and Mini Regulator Drain Check are warranted for one year from date of original sale to be free of defective materials and
workmanship when used within the working specifications for which the product was designed and under normal use and service. The manufacturer assumes no responsibility for installation,
removal or unauthori ed repair of defective parts. The manufacturers liability under this warranty is limited solely to replacement or repair of defective parts and the manufacturer will not
be liable for any crop or other consequential damages resulting from defects or breach of warranty. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSES AND OF ALL OTHER OBLIGATIONS OR LIABILITIES OF MANUFACTURER. No agent, employee
or representative of the manufacturer has authority to waive, alter or add to the provisions of this warranty, nor to make any representations or warranty not contained herein. The Mini Regulator
Drain Check is covered by the following U.S. Patents: 5875815, 5257646, and other pending US and Foreign Patents.
Use the Nelson Pressure Gauge
Tap assembly to check your system
operating pressures at the inlet of
the MRDC.
HOW THE MINI
REGULATOR (MR) AND
MINI REGULATOR DRAIN
CHECK (MRDC) WORK:
LOW PRESSURE
(neither regulate, the MR is open,
the MRDC is closed to draining)
DRAINING AFTER SHUT OFF
(the MR is open, the MRDC is
closed to draining)
NORMAL PRESSURE
(with adequate pressure
they both regulate)