Bently Nevada 18639-04 (کد: )

AC LVDT Valve Position Transducer

A complete Turbine Supervisory Instrumentation System (TSI) should include measurement of governor valves on the steam turbine. By measuring the opening of these valves, you can monitor and adjust the amount of steam that flows to the individual valves in the group to provide the highest machine operating efficiency.The 18639 Valve Position Transducer consists of an AC Linear Variable Differential Transformer (LVDT) that connects to the governor valve and measures valve opening. The LVDT has an internal nickel-iron core that moves in and out of a stainless steel casing. This casing contains primary and secondary coils that provide an electrical output based on the position of the core.The AC LVDT Valve Position Transducer system must be attached to the 3500/45 Position Monitor or the 3300/70 Dual Valve Position Indicator to measure valve position. The 1-, 2-, and 4-inch models can also measure steam turbine case expansion for high temperature applications when used with the 3500/45 monitor.The transducer may require a core connecting rod to link up with a flange on the governor valve. This rod is made of aluminum and is available in six lengths.