SYMPTOM: 800 Series valve will not pressure regulate.
CHECK ITEMS: bCheck all tube lines and fittings are connected as shown on the diagram and that all
isolation valves are in the open position.
bCheck that the regulating 9358 spool valve inside the 9529 pressure control is not stuck.
This spool valve must be free to move in response to down stream pressure. Inspect the spool
valve by unscrewing the sensitivity bushing assembly as shown in this drawing.
bCheck the filter to assure it can pass adequate water flow. A partially blocked filter will reduce
the valve regulating and closing response time. If little or no flow is present then clean the filter.
SYMPTOM: The regulated pressure is unstable (fluctuating high and then low several times a minute) and
water is discharged from the exhaust port during each low pressure cycle.
CHECK ITEMS: bCheck for trapped air in the pipe system down stream from the 800 Series valve. This
problem is not easily detected. The installation of an automatic air release valve will help rid
the system of trapped air. It is recommended this type of air release valve be installed at high
elevation points on the system where air could accumulate. Typical location for the
accumulated air is shown.
Note: Be sure to drain the system to reduce the potential of winter freeze damage.
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
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800 SERIES CONTROL VALVE — PRESSURE REDUCING MANUAL ON-OFF CONTROL
TROUBLE SHOOTING GUIDE
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