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 PERFORMANCE DETAILS
5.0 TECHNICAL PERFORMANCE DETAILS
5.1 PRESSURE OPTIONS
The regulator pressure options are for outlet pressure of 20 psi, 30 psi, 35 psi, 40 psi, 45 psi and 50 psi. The
regulator pressure output is set by the spring installed at the factory. The regulator is not field adjustable.
5.2 FLOW EFFECT ON OUTLET PRESSURE
The above graph shows that the mini-regulator outlet pressure slightly decreases as the flow increases. This
slight reduction in nozzle flow is typical for pressure regulators and is very small.
5.3 PERFORMANCE CONSIDERATIONS
The MR is always open and creates very little nozzle turbulence. The worst case for turbulence is for the MRDC
or MDC to be in a partially open condition. The problem is avoided by operating above the recommended
minimum pressure
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. Remove the MRDC or MDC and drain the irrigation system during freezing conditions to prevent damage to
the irrigation system. THIS PRODUCT IS NOT RECOMMENDED FOR USE IN FREEZING CONDITIONS.
3. Partial plugging of the MRDC inlet can cause severe distortion of distribution patterns and decreased flow.
4. The maximum recommended inlet pressure is 130 PSI.
5. This product requires flow through it to regulate pressure. IT IS NOT RECOMMENDED FOR USE IN
CONTINUOUSLY STATIC CONDITIONS.
6. If subsurface application is needed then it is OK to bury the MR and MRDC but, consideration should be
given to maintenance access and debris plugging before burying the regulator.
OUTLET PRESSURE
(PSI)
INLET PRESSURE (PSI)
MINI REGULATOR PERFORMANCE GRAPH (30, 40 and 50 PSI model)
5
1 GPM
2 GPM
3 GPM
4 GPM
5 GPM
40 PSI
30 PSI
20 PSI
5 GPM
4 GPM
2 GPM
3 GPM
1 GPM
2 GPM
3 GPM
4 GPM
5 GPM
1 GPM
10
20
30
15
25
35
29
27
25
23
21
45
55
40
50
60
70
80
90
41
43
45
39
37
35
51
49
47
55
53
57
50 PSI
100
31
33
