Dover Wilden Advanced H25, Инженерия, эксплуатация и обслуживание

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SECTION 6F
TROUBLESHOOTING
Pump will not run or runs slowly.
1. Check for pressurized air at the inlet.
2. Check air inlet and filter for debris.
3. Connect a test lamp to the two wires which run to pump
and ensure that the lamp cycles on and off.
4. Make sure that the air valve manual override (small red
knob on front of valve) is switched to the "0" position.
5. Check pilot pressure vent at the top of the operator/coil
assembly to ensure that it is not clogged.
6. Check for a worn out air valve. If air continually blows
out the exhaust in very large quantities, the air valve
seals may be worn beyond their ability to function. In
this case, the valve must be replaced.
NOTE : It is possible that a malfunctioning valve can be
saved by completely disassembling the valve, cleaning
and re-lubricating for proper operation.
7. Disassemble pump and check for obstructions in the air
passageways or objects which would obstruct the
movement of internal parts.
8. Remove shipping plugs.
Pump runs but little or no product flows.
1. Check that the discharge isolation valve is not closed.
2. Check that the electric signal is slow enough that the
pump is able to complete each physical stroke before it
is signaled to change direction. The time required to
complete the stroke is determined by a variety of factors
which include fluid viscosity and head pressure.
3. Check for pump cavitation; slow pump speed down to
match the thickness of the material being pumped.
4. Check for sticking ball and check valves. If the material
being pumped is not compatible with the pump elas-
tomers, swelling may occur. Replace seals with the
proper elastomers.
5. Check to make sure that all suction connections are air
tight, and that the fasteners are properly tightened.
Air bubbles in pump discharge.
1. Check for damaged or worn liquid piston seal.
2. Check tightness of fasteners, and the integrity of the O-
rings, especially at intake manifold plate.
Product comes out air exhaust.
1. Check for damaged or worn power piston seal.
2. Check tightness of liquid piston to liquid piston screw.
Solenoid buzzes or solenoid burnout.
1. Incorrect voltage, faulty or dirty solenoid.
Solenoid valve fails to shift electrically but shifts with
manual override.
1. Incorrect voltage, defective coil or wiring.
Valve shifts but fails to return.
1. Broken spring, mechanical binding.
Excessive leaking from air valve vent.
1. Worn seals in air valve.