Nelson Irrigation Corp. 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: 509.525.7660 Fax: 509.525.7907 E-mail: info@nelsonirrigation.com Web site: www.nelsonirrigation.com
VALVE CONTROL FUNCTION:
The PRESSURE REDUCING MANUAL ON-OFF model of the 800 Series Control
Valve is a hydraulically operated sleeve type valve with a pressure
reducing pressure control kit and a manual on-off. The flow through
the valve is controlled by a rubber sleeve which is actuated by
hydraulic pressure. When the selector is pointed to the "AUTO" position
then the valve will automatically reduce a higher inlet pressure to a
constant lower downstream pressure. The pressure reducing control
is adjustable to give a constant down stream pressure even with
fluctuating upstream pressure. The manual selector is used to
manually open or close the valve. Pointing the manual selector
handle to "OPEN" or "CLOSE" will override the "AUTO" control. Pointing the
Manual Selector handle mid way between "OPEN" and "CLOSE" will
hold the valve partly open.
The information on this sheet is for the
PRESSURE REDUCING MANUAL ON-
OFF control function with plastic tubing and internal or external filter
option (items D2 - D4, D12-D13, E1, H2 - H3 control function on
the VALVE SELECTION GUIDE apply to this sheet).
800PR5
800 SERIES CONTROL VALVE — CONTROL FUNCTION and MAINTENANCE
PRESSURE REDUCING MANUAL ON-OFF
D
MANUAL
SELECTOR
INTERNAL
FILTER
PRESSURE
REDUCING
CONTROL
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