The VPO electric motor driven rotary vane primer is mounted directly on a Waterous midship pump transmission. A separately mounted model VPOS is also available. With the priming valve, it forms a complete, dependable, factory installed priming system.
Vacuum Activated Priming Valve (VAP):
This valve consists of a stainless steel valve stem, spring and pressure disk in a plastic valve body. A rubber disk forms the seat for the valve stem and also forms a seal between the priming valve inlet and the pump body. A rubber diaphragm forms a seal which allows the valve to open and close while isolating the interior of the priming valve from atmospheric pressure
Optional Priming Lubricant:
Lubricant may be used to help seal and lubricate the priming pump.
Optional AUTO-PRIME FEATURE:
Consists of a Pressure Switch which is installed in the pump and connected to the priming pump motor.
When the switch detects a drop of 10 psi in pressure, the priming pump is activated.