A high-pressure pump is only ever as good as the system around it. Inlet supply, protection and pipework determine whether the pump works at its design point – or permanently under conditions that wear out seals and valves early.
You will find the matching components under accessories, including safety and relief valves, pressure regulating valves and pulsation dampeners.
What inlet conditions does a high-pressure pump require?
The pump must always be supplied with sufficient fluid on the suction side. Ideal is a flooded inlet with slight positive pressure from an adequately sized, settled tank. The inlet line should be at least one nominal size larger than the pump inlet, kept short and routed with as few bends as possible. Inadequate inlet supply is the most common cause of cavitation and premature wear.
Why is a safety valve mandatory and how is it set?
A positive-displacement pump keeps delivering against any resistance – if the discharge line is blocked, pressure rises uncontrolled without protection. The safety valve limits pressure and typically opens 10 to 20 percent above the operating pressure. Example: 320 bar operating pressure gives a set pressure of approximately 380 bar.
How do I select the right pressure gauge?
Full-scale value should be roughly twice the operating pressure so the pointer works in the easily readable middle range. Example: at 320 bar operating pressure, a scale of 0 to 600 bar. Stainless steel is the standard version.
What is a pulsation dampener for?
It smooths the pump's residual pulsation and protects lines, fittings and instruments from pressure surges. Important: nitrogen pre-charge must be about 60 percent of the operating pressure and should be checked regularly – a dampener without pre-charge has no effect.
What happens in bypass operation and why is it time-limited?
When demand stops – for example when the gun is closed – the pump circulates through the pressure-regulating or bypass valve. The water heats up with every pass. Prolonged bypass operation leads to overheating, vapour formation and seal damage. Remedies: route the bypass line back to the tank, fit a thermal valve, or switch the system off on demand using a pressure switch or controller.
How do I size the suction and discharge lines correctly?
Size the suction line generously – at least one nominal size larger than the pump inlet – short and with few changes of direction: every bend and every metre costs inlet pressure. The discharge line must be rated for the maximum system pressure including a safety margin. Undersized lines cause pressure losses, pulsation and cavitation.