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Frequently Asked Questions
How does it hold a constant flow?
With a spring-loaded cartridge inside.
Rising pressure pushes it further closed.
Reducing the aperture to match.
Falling pressure lets it open again.
Flow stays at its rated figure.
What does that remove from commissioning?
The measurement exercise, entirely.
No differential readings or flow charts.
No sequence to follow between branches.
Each valve is specified and fitted.
And the errors go with the exercise.
Why does it suit variable-flow systems?
Because it absorbs the pressure changes.
Control valves throttling shift the pressures.
A static setting drifts when that happens.
This cartridge closes to compensate.
So the branch keeps its design flow.
What is the control band?
The differential range it works across.
Stated by the manufacturer for each valve.
Below the minimum it cannot limit flow.
So the pump must deliver enough head.
Check it against the system, not just the flow.
Does it cost anything hydraulically?
Yes - permanent pressure loss.
The control band has to be absorbed.
Which the pump has to provide.
It is the price of self-regulation.
Account for it in the pump duty.