SAMSON's large-sized self-operated regulators are also used in district heating and cooling applications to control the temperature, pressure, differential pressure and flow rate as well as to monitor the pressure and temperature for safety reasons. They provide a high dynamic response and small system deviations.
The principle of operation of the self-operated regulators manufactured at SAMSON is based on a comparison of forces. Friction forces or forces created by the pressure drop at the valve plug impair the valves' control behavior. Consequently, the pressure-balancing mechanism plays a key role in the valves. Pressure balancing counterbalances forces acting on the valve plug, which are created by the medium flowing through the valve. As a result, the regulators work without being influenced by changes in the pressure drop across the valve, they can shut off tightly even at high differential pressures and they can be manufactured in large valve sizes as well.
The requirements placed on the modern electric valves can also be met by self-operated regulators in sizes up to DN 400 fitted with a pilot valve to work as a control unit. Specially engineered control units are used in heating and cooling circuits, which combine pressure reducing valves, excess pressure valves and regulators for differential pressure and/or flow rate control together with electric pilot valves on which TROVIS 5824-8 Electric Actuators with Process Controller are mounted. As a result, the functions provided by self-operated regulators are stretched even further, for example: