PowerVac G Check Valve Test and Repair
Vacuum pressure keeps valve closed when pump is running. When pump stops, valve opens for liquids and solids to drain. Multiple units have two additional check valves located in the tee assembly.
When installing check valve in horizontal position, confirm the hinge for the flapper is on top of the valve.
The check valve located in the drain allows the separator to drain upon removal of vacuum pressure. When the pump is not running, the valve opens, allowing liquids to drain. If the pump is running, the valve closes to keep air in the drain from back flushing into the system.
Each vacuum pump in a multiple pump installation requires a check valve to be installed into the intake line.
This prevents loss of suction pressure when one pump in the system is turned off. If no check valve is present, flow will be allowed through the “off” pump, creating a loss of suction of the rest of the system.
Check the Check Valve
When working on Twin units, unplug parallel harness.
1.Vacuum 1-2 gallons of fresh water into system through operatory lines.
2.Turn vacuum off and ensure that water drains from separator.
If water does not drain out, remove lid and see if valve is clogged. Flush and clean tank Refer to: Separator Tank to clean valve If not draining replace valve. If water drains out, continue with next step.
3.Turn power off.
4.Allow unit to drain completely.
5.Pull drain hose out of drain. Turn power on and place hand over end of drain hose. If you feel suction, check valve is stuck, replace check valve. If no suction is felt, check valve is good.
