The Heronbank blocks accommodate 700 students, and nearly a thousand Oventrop TRV/lockshield sets have been installed.
Series AV6 TRVs, which can be serviced in line, and Combi 4 lockshield valves are fitted to the radiators. These TRVs have characterised valve ports so that the flow rate can be set to the design figure using a calibrated setting scale.
To limit the differential pressure across the TRVs as they close, which could result in excessive noise and water flow, the system is arranged in subcircuits serving a number of radiators.
Each branch has a double-regulating valve and metering station on the flow and a Hydromat DP direct-actuated differential-pressure-control valve on the return. These valves are linked by a capillary so that the control valve can monitor and control the branch differential pressure. The metering station provides the means to set up the different-pressure control at the design flow to the branch.
