Control Valve
Application
Guide
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
FLOW PATHS AND PORTS FOR CONTROL COMPONENTS
Solenoids
Solenoid valves control the automatic switching which, when electrically energized or de-energized, either
shutoff or allow flow in the control tube.
When power is off the
Normally Open (NO)
port is is connected to
common. The NO port
is generally attached
to upstream.
Manual selector valve Remote hydraulic relay
Reducing Pressure Control Sustaining Pressure Control
The same pressure control is used for both the reducing and sustaining. Only the port label and hook up of the tubing varies.
Conversion from reducing to sustaining is made easy by using the #9519 label.
APPENDIX C
When power is on the
Normally Closed (NC)
is connected to common.
The NC port is attached
to the auto port of
manual selector valve.
19
