Measured flow catches up after the target changes.
Response time varies with the circuit.Valve position
Move the slider to turn the ball inside the valve.
How position affects flow
At full opening, the bore lines up with the pipe. The percentage shows the requested valve position.
The actual response also depends on the valve characteristic, the available pressure and the resistance of the connected loop.
Flow management
Control the flow.
Verify the response.
The intended control loop compares measured rack flow with the specified target. The controller adjusts the valve, then reads the flow again. Valve position, actual actuator feedback and measured flow remain separate values.
- The control variable
- Measured rack flow, compared with an agreed flow setpoint within the rack's operating envelope.
- The context
- Supply and return temperatures and pressure at defined points. Differential pressure requires two measurement points.
- The operating policy
- Setpoint source, minimum flow, command limits, response time, override and behaviour on sensor, power or communication loss.
The final specification defines the control logic and interfaces. Rack-level feedback does not establish individual tray flow or automatic branch balancing.
Read the response beside the command.
Keep the commanded position, measured flow and pressure in the same operating record. Confirm whether a position value is the requested setting or feedback from the actuator.
After an adjustment, allow the system to respond using the agreed control procedure. Compare the resulting readings with the expected operating range for the installed rack.
Define the behaviour before integration.
- Command and feedback
- Agree the actuator interface, available feedback and how each value is identified.
- Loss of power or communication
- Document the required valve behaviour and the system response.
- Operating limits
- Agree permitted positions and changes with the cooling-system designer and equipment requirements.
Common questions
Does 50% open mean 50% flow?
No. The relationship depends on the valve characteristic and the hydraulic conditions. Use measured flow to see the result.
Does FluidSensing automatically balance every tray?
The described manifold provides rack-level sensing and integrated valve control. The rack-flow feedback architecture is defined above. Individual branch sensing, actuation and balancing remain separate design decisions.
Which control protocol is used?
The actuator and communication interface are confirmed in the installation specification. Do not assume a protocol or feedback capability from the product illustration.
Product details and rack requirements.
Read the product brief and use the specification guide to define the requirements for your rack.