Walla Walla MP RISER, Application Manual

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WARRANTY AND DISCLAIMER: Walla Walla Sprinkler Company MP Rotators® are warranted for one year from date of original
sale to be free of defective materials and workmanship when used within the working specifi cations for which the products
were designed and under normal use and service. The manufacturer assumes no responsibility for installation, removal or
unauthorized 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 fi tness 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 seller undertakes no responsibility for the quality of the goods except
as otherwise provided in this contract, and the seller assumes no responsibility that the goods will be fi t for any particular
purpose for which you may be buying these goods, except as otherwise provided in this contract.
This product may be covered by one or more of the following U.S. Patent Nos. 4842201, 4867379, 4898332, 4967961, 5058806,
5288022, 6244521, 6499672, 6651905, 6688539, 6736332, 7032836 and other U.S. Patents pending or corresponding issued or
pending foreign patents.
A subsidiary of Nelson Irrigation Corporation
(A world leader in water application solutions for agriculture)
848 Airport Road
Walla Walla, WA 99362-2271, U.S.A.
Tel: +1 509-525-7660
Fax: +1 509-525-7907
info@mprotator.com
www.mprotator.com
FLOW LIMITS
Do not exceed 5 GPM (18.9 LPM) fl ow. Inlet
pressure must always be at least 5 PSI (0.4 BAR)
higher than the desired, regulated pressure.
FILTRATION REQUIREMENTS
The regulator has small openings in the
seat and plunger area. Debris smaller than
1/16” (1.58 mm) in diameter may easily pass
through the regulator. Larger material and
stringy fi bers can plug inside the regulator
seat area. Access to remove the plug is
gained through the inlet of the regulator.
MPR / MPRDC DIFFERENCES
The MP Regulator (MPR) is normally open.
This means that water passes through the
regulator and sprinkler as the system pres-
surizes. The MP Regulator Drain Check
(MPRDC) is normally closed. As the system
is pressurized the MPRDC remains closed
until the pressure reaches approximately
13 PSI ( 0.9 BAR) below the labeled pressure.
Example: a 40 PSI (2.8 BAR) MPRDC opens at
27 PSI (1.9 BAR) and provides accurate pres-
sure regulation at 45 PSI (3.1 BAR).
Pressure Regulators
MP Regulators (MPR) are designed to accurately deliver a set
outlet pressure when inlet pressures are higher than desired.
The MP Regulator Drain Check (MPRDC) adds a “check valve”
function that prevents low head drainage but without any
incremental pressure loss. MPRDCs also ensure that when the
valve opens, all sprinklers turn on at once and at full radius.
The
ACME X ACME models are for the MP Riser . The 1/2”
FNPT X ACME
models are for 1/2” PVC Risers.
ACME inlet for MP Riser connection,
1/2” FNPT inlet for PVC Riser connection
(pr5 psi above regulator psi)

Acme Adapter
(required)
MP Rotator
Acme outlet
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OUTLET PRESSURE (PSI & BAR )
IN
LET PRESSURE
(PSI &
B
AR
)
MP REGULATOR PERFORMANCE GRAPH
1 2 3 4 5 6 7
2.1 BAR
2.8 BAR
3.5 BAR
4.1 BAR
MPR (GRAY)
pressure
regulation only
MPRDC (BLACK)
pressure regulation
and drain check
Pressure Options: 30 PSI (2.1 BAR), 40 PSI (2.8 BAR), 50 PSI (3.5 BAR)
Recommended Flow Range: 0.15 GPM (0.6 LPM) to 5 GPM (18.9 LPM)
Maximum Inlet Pressure: 130 PSI
(9.0 BAR)
Minimum Inlet Pressure: 5 PSI (0.4 BAR) above regulator pressure
Opening & Closing Pressures for the MP Rotator Regulator Drain Check :
PRESSURE OPTION PRESSURE TO OPEN PRESSURE TO CLOSE HOLD BACK ELEVATION
30 PSI (2.1 BAR) 23 PSI (1.6 BAR) 15 PSI (1.0 BAR) 35 ft. (10.7 M)
40 PSI (2.8 BAR) 28 PSI (1.9 BAR) 19 PSI (1.3 BAR) 44 ft. (13.4 M)
50 PSI (3.4 BAR) 38 PSI (2.6 BAR) 29 PSI (2.0 BAR) 67 ft. (20.4 M)