Nelson 800 Series Quick Start Manual

VALVE CONTROL FUNCTION:
The
PRESSURE REDUCING ELECTRIC RATE
with a pressure reducing pressure control, an electric solenoid for on/off and a Rate-Of-Flow control. The flow through the
valve is controlled by a rubber sleeve which is actuated by hydraulic pressure responding to the controls as listed here:
· When the selector is pointed to the "
The 3-way electric solenoid must be energized to open the valve and de-energized to close the valve. Pointing the manual
selector handle to "
OPEN
selector valve to "
CLOSE
· The Rate-Of-Flow control senses the flow by means of a paddle. The Rate-Of-Flow function depends on flow rate and not
on pressure. The Rate-Of-Flow adjustment screw is normally set to 120% of design flow to limit the flow during system start
up. After the system is filled and back pressure is available then the pressure reducing control takes over to control the
downstream pressure. If the Rate-Of-Flow setting is less than design flow rate then the Rate-Of-Flow retains control to hold
the flow rate down and keep the valve from fully opening. The pressure reducing control serves no function if the Rate-
Of-Flow is set less than design flow rate.
· The pressure reducing pilot controls the valve to automatically reduce a higher inlet pressure to a constant lower
downstream pressure. The pressure reducing control is adjustable to give the desired constant down stream pressure even
with fluctuating upstream pressure.
· When the selector is pointed to "
no effect.
· Pointing the Manual Selector handle mid way between "
The information on this sheet is for the
filter options (items D2 through D4, D18, E20 - E70, H2 & H3 control function on the
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
800 SERIES CONTROL VALVE — CONTROL FUNCTION and MAINTENANCE
PRESSURE REDUCING ELECTRIC RATE-OF-FLOW
- - model of the 800 Series Control Valve is a hydraulically operated sleeve type valve
OF FLOW
" position then the electric solenoid is used to automatically open or close the valve.
AUTO
" will override the " " control and bypass the electric solenoid functions. Pointing the manual
AUTO
" will always close the valve.
" the pressure reducing and Rate-Of-Flow controls still function but the solenoid has
OPEN
PRESSURE REDUCING ELECTRIC RATE
" and " " will lock the valve sleeve in position.
OPEN CLOSE
- - control function with both internal and external
OF FLOW
VALVE SELECTION GUIDE
D
800REFC4
E
apply to this sheet).