2-way and 3-way characterised control valves Notes for project planning
2021-10-15
●Relevant information
■The data, information and limit values listed on the "Characterised control valves" data sheets are to be taken into account and/or complied with, respectively.
●Closing and differential pressures
■The maximum permissible closing and differential pressures can be found in the data sheets.
●Pipeline clearances
■The minimum clearances between the pipelines and the walls and ceilings required for project planning depend not only on the valve dimensions but also on the selected actuator and can be found in the data sheets of the valves and actuators.
●2-way characterised control valves
■Characterised control valves are to be installed in the return as throttling devices. This leads to lower thermal loads on the sealing elements in the valve. The prescribed flow direction must be observed.
●3-way characterised control valves
■3-way characterised control valves are mixing devices. The flow direction must be observed for all pressure levels. Installation in the supply or return is dependent on the selected hydraulic circuit.
The 3-way characterised control valve may not be used as a diverting valve.
●Diverting circuit
■Thanks to the reduced flow rate in the bypass, no balancing valve in the bypass line is necessary with the diverting circuit.
●Water quality
■The water quality requirements specified in VDI 2035 must be adhered to.
●Dirt filter
■Characterised control valves are regulating devices The use of dirt filters is recommended in order to prolong their service life as modulating instruments.
●Shut-off devices
■Care must be taken to ensure that sufficient numbers of shut-off devices are installed.
■The data, information and limit values listed on the "Characterised control valves" data sheets are to be taken into account and/or complied with, respectively.
●Closing and differential pressures
■The maximum permissible closing and differential pressures can be found in the data sheets.
●Pipeline clearances
■The minimum clearances between the pipelines and the walls and ceilings required for project planning depend not only on the valve dimensions but also on the selected actuator and can be found in the data sheets of the valves and actuators.
●2-way characterised control valves
■Characterised control valves are to be installed in the return as throttling devices. This leads to lower thermal loads on the sealing elements in the valve. The prescribed flow direction must be observed.
●3-way characterised control valves
■3-way characterised control valves are mixing devices. The flow direction must be observed for all pressure levels. Installation in the supply or return is dependent on the selected hydraulic circuit.
The 3-way characterised control valve may not be used as a diverting valve.
●Diverting circuit
■Thanks to the reduced flow rate in the bypass, no balancing valve in the bypass line is necessary with the diverting circuit.
●Water quality
■The water quality requirements specified in VDI 2035 must be adhered to.
●Dirt filter
■Characterised control valves are regulating devices The use of dirt filters is recommended in order to prolong their service life as modulating instruments.
●Shut-off devices
■Care must be taken to ensure that sufficient numbers of shut-off devices are installed.
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