Mode of operation: The final controlling device is comprised of four components: characterised control valve (CCV), measuring pipe with volumetric flow sensor, temperature sensors and the actuator itself. The adjusted maximum flow (Vmax) is assigned to the maximum positioning signal (typically 10 V / 100%). Alternatively, the positioning signal can be assigned to the valve opening angle or to the power required on the heat exchanger (see power control). The final controlling device can be controlled communicative or analogue. The medium is detected by the sensor in the measuring pipe and is applied as the flow value. The measured value is balanced with the setpoint. The actuator corrects the deviation by changing the valve position. The angle of rotation α varies according to the differential pressure through the final controlling element (see flow rate curves).
Transmission behaviour: HE Heat exchanger transmission behaviour Depending on the construction, temperature spread, medium and hydraulic circuit, the power Q is not proportional to the water volumetric flow V (Curve 1). With the classical type of temperature control, an attempt is made to maintain the control signal Y proportional to the power Q (Curve 2). This is achieved by means of an equalpercentage valve characteristic curve (Curve 3).
Power control: Alternatively, the positioning signal Y can be assigned to the output power required on the heat exchanger. Depending on the water temperature and air conditions, the Energy Valve ensures the amount of water required V to achieve the desired power
Control characteristics: The specially configured control parameters in connection with the precise velocity sensor ensure a stable quality of control. They are however not suitable for rapid control processes, i.e. for domestic water control.
Definition: Vnom is the maximum possible flow. Vmax is the maximum flow rate which has been set with the greatest positioning signal, e.g. 10 V. Vmax can be set to between 30% and 100% of Vnom.
Definition: Qmax is the set maximum power output on the heat exchanger (in power control mode)
Creep flow suppression: Given the very low flow speed in the opening point, this can no longer be measured by the sensor within the required tolerance. This range is overridden electronically. Opening valve The valve remains closed until the volumetric flow required by the positioning signal Y corresponds to 1% of Vnom. The control along the valve characteristic curve is active after this value has been exceeded. Closing valve The control along the valve characteristic curve is active up to the required flow rate of 1% of Vnom. Once the level falls below this value, the flow rate is maintained at 1% of Vnom. If the level falls below the flow rate of 0.5% of Vnom required by the reference variable Y, then the valve will close.
Communication: The parameterisation can be carried out through the integrated web server (RJ45 connection to the web browser) or by communicative means. Additional information regarding the integrated web server can be found in the separate documentation.
Positioning signal inversion: This can be inverted in cases of control with an analogue positioning signal. The inversion causes the reversal of the standard behaviour, i.e. at a positioning signal of 0%, regulation is to max or Qmax, and the valve is closed at a positioning signal of 100%.
Hydraulic balancing: Via the integrated web server, the maximum flow rate (equivalent to 100% requirement) can be adjusted on the device itself, simply and reliably, in a few steps. If the device is integrated in the management system, then the balancing can be handled directly by the management system.
Delta-T manager: If a heating or cooling register is operated with a differential temperature that is too low and thus with a flow rate that is too high, this will not result in an increased power output. Nevertheless, heating or cooling machines must provide the energy at a lower degree of effectiveness. Pumps circulate too much water and increase energy consumption unnecessarily. With the aid of the Energy Valve, it is simple to discover that operation is being carried out at a differential temperature that is too low, resulting in the inefficient use of energy. Necessary setting adjustments can now be carried out quickly and easily at any time. The integrated differential temperature control offers the user in addition the possibility of defining a low limit value. The Energy Valve limits the flow rate automatically to prevent the level from falling below this value.
Combination analogue - communicative: The integrated web server, BACnet IP, BACnet MS/TP or MP-Bus can be used for the communicative position feedback with conventional control by means of an analogue positioning signal. When the combination of positioning signal Y and communicative position feedback is used, it is imperative to ensure that the communicative path is used solely for data transfer from the Energy Valve to the higher-level management system. If the setpoint value is transferred communicatively via bus to the Energy Valve, then the analogue control will be automatically deactivated. This deactivation can be reversed by disconnecting the Energy Valve from the power supply.
Power and energy monitoring function: The final controlling device is equipped with two temperature sensors. A sensor (T2) must be installed at the valve and the second sensor (T1) must be installed on-site on the other side of the water circulation. The two sensors are enclosed with the system already wired. The sensors are used to record the medium temperature of the supply and return lines of the consumer (heating/cooling coil). As the water quantity is also known, thanks to the volumetric flow measurement integrated in the system, the power released from the consumer can be calculated. Furthermore, the heating/cooling energy is also determined automatically by means of the evaluation of the power over time. The current data, e.g. temperatures, volumetric flow volumes, exchanger energy consumption, etc. can be recorded and accessed at any time by means of web browsers or communication (BACnet or MP-Bus).
Data recording: The recorded data (integrated data recording for 13 months) can be used for the optimisation of the overall system and for the determination of the performance of the consumer. Download csv files through web browser.
Manual override: Manual override with push-button possible (the gear is disengaged for as long as the button is pressed or remains locked).
High functional reliability: The actuator is overload protected, requires no limit switches and automatically stops when the end stop is reached.
Home position: The first time the supply voltage is switched on, i.e. at the time of commissioning, the actuator carries out an adaption, which is when the operating range and position feedback adjust themselves to the mechanical setting range. After this process the actuator moves into the required position in order to ensure the flow rate defined by the positioning signal.