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
The sleeve exhaust is a special valve used to exhaust water from the sleeve chamber and allow fast opening response on the
valve. The sleeve exhaust is most often used with turbine well pumps. During start-up a column of water begins moving at high
velocity. When the water contacts the valve, quick opening is required to prevent damage.
Special on/off mode valves are used where standard valves don't work due to system requirements. An example
of this is the hydraulic remote control which eliminates the need for wires in the field. See section 2.4.2 for more information
on the hydraulic remote function. Contact the factory for specific details on the special function valve control. See Appendix
D for a quick lookup table.
2.2 TYPICAL VALVE APPLICATIONS
Typical valve applications in agriculture are shown in Figure 2 on the following page labeled TYPICAL CONTROL APPLICATION.
The sketch indicates where the different valves could be applied. Not every valve control type is required on most systems.
The sketch is for demonstration purposes only.
2.3 800 SERIES SLEEVE VALVE PARTS TERMINOLOGY
It is necessary to know the name of the parts of the basic sleeve valve to understand how the valve functions. The cross section
drawing (Figure 1) shows the general parts of the Nelson 800 series valve.
SELECTING THE RIGHT VALVE
Figure 1
3
