Electrical Shunt Gate Valves Serie VDE
MAIN CHARACTERISTICS : The VDE valve is designed for use in combined home boilers with instant and semi-rapid production of domestic hot water. It is designed to shunt the flow of water away from the primary boiler circuit to the secondary heat exchanger, excluding the heating circuit (priority to hot water). It can be used in boilers that employ series VDP series VDP/M valves without changing the layout of the boiler fittings and by merely inserting the control unit. |
FUNCTION : VDE valves can be powered by a linear synchronous or step-by-step electric motor. Version VDE/ML does not have a limit microswitch and must be controlled by an external control unit which receives its input signal from a flow switch and/or from a temperature probe. Version VDE/MR is equipped with a limit microswitch. There are two types of valve depending on the type of gate:
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When the valve stem is in its low position and path A is closed the flow is shunted to path B (hot water heater path, Fig.2). When the stem is in its high position and path B is closed the flow is switched to path A (heating plant, Fig.1). A power failure will leave the valve in the position it was in at the time of failure. |