Moving a column of water to create a flow is what a pump actually does. When water passes through a nozzle, pressure results from a restriction on that column of water. What we really mean when we speak of a pump’s ability to develop a certain pressure at a certain flow is that the pump is capable of moving that quantity of water per minute through a restriction or nozzle which will create the specified pressure.
Most pressure washer pumps used in the pressure washing industry rely on a system of cylinders and valves in order to develop a flow of water. The activity of motion of a piston or plunger in the cylinder pulls water through the inlet valve and the upstroke discharges the water through the outlet valve. These valves essentially send the water through the pump by preventing back flow.
The simplest valve design consists of a poppet and a spring which is hydraulically operated by differences in pressure on either side of the valve. The valve opens when the pressure against the valve starts to exceed the ability of the spring to hold closed the poppet. The valve is held closed and prevents flow of the water in the wrong direction on the opposite stroke; This is when the water presses the poppet against its seat.
There are three ways the flow of water through the pump can be controlled: By lengthening or shortening the stroke of the piston or plunger, by increasing or decreasing the speed at which the pump operates or by increasing or decreasing the bore of the cylinder.
Most pressure washer pumps used in the pressure washing industry rely on a system of cylinders and valves in order to develop a flow of water. The activity of motion of a piston or plunger in the cylinder pulls water through the inlet valve and the upstroke discharges the water through the outlet valve. These valves essentially send the water through the pump by preventing back flow.
The simplest valve design consists of a poppet and a spring which is hydraulically operated by differences in pressure on either side of the valve. The valve opens when the pressure against the valve starts to exceed the ability of the spring to hold closed the poppet. The valve is held closed and prevents flow of the water in the wrong direction on the opposite stroke; This is when the water presses the poppet against its seat.
There are three ways the flow of water through the pump can be controlled: By lengthening or shortening the stroke of the piston or plunger, by increasing or decreasing the speed at which the pump operates or by increasing or decreasing the bore of the cylinder.
FAQ
Problem:
Oil leak Between Crankcase and Pumping Section:
Probable Cause: Worn crankcase piston rod seals, O-rings on plunger retainer worn.
Solutions: Replace crankcase piston rod seals, Replace O-rings.
Problem:
Frequent or Premature Failure of the Packing:
Probable Cause: Scored, damaged or worn plunger.
Solutions: Replace plungers.
Oil leak Between Crankcase and Pumping Section:
Probable Cause: Worn crankcase piston rod seals, O-rings on plunger retainer worn.
Solutions: Replace crankcase piston rod seals, Replace O-rings.
Problem:
Frequent or Premature Failure of the Packing:
Probable Cause: Scored, damaged or worn plunger.
Solutions: Replace plungers.
Problem:
Frequent or Premature Failure of the Packing
Probable Cause: Overpressure to inlet manifold
Solutions: Reduce inlet pressure.
Problem:
Frequent or Premature Failure of the Packing
Probable Cause:Abrasive material in the fluid being pumped
Solutions: Install proper filtration on pump inlet plumbing.
Problem:
Frequent or Premature Failure of the Packing
Probable Cause: Escessive pressure and/ or temperature of fluid being pumped.
Solutions: Check pressures and fluid inlet temperature; be sure they are within specified range.
Problem:
Frequent or Premature Failure of the Packing
Probable Cause: Over pressure of pumps, Reduce pressure.
Solutions: Reduce pressure, do not run pump without water.
Problem:
Pump Runs but Produces no flow
Probable Cause: Pump is not primed
Solutions: Flood suction then restart pump.
Problem:
Pump Fails to prime
Probable Cause: Air is trapped inside pump
Solutions: Disconnect discharge hose from pump. Flood suction hose, restartpump and run pump until all air has been evacuated.
Problem:
Pump Loses Prime, Chattering Noise, Pressure Thread Fluctuates
Probable Cause:
*Air leak in suction hose or inlet fittings
*Clogged suction strainer
Solutions:
*Remove suction line and inspect it for a loose liner or debris lodged in hose. Avoid all unnecessary bends. Do not kink hose.
*Clean strainer
Problem:
Low Pressure at Nozzle
Probable Cause:
*Unloader valve is bypassing
*Incorrect or worn nozzle
*Restricted intake
Solutions:
*Make sure unloader is adjusted properly and bypass seat is not leaking
*Make sure nozzle is matched to the flow and pressure of the pump. If th nozzle is worn, replace.
*Refer to above priming information.
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