OPENING AND CLOSING DEVICE OF MODULATING VALVE FOR TESTING RELIEF VALVE OF NUCLEAR POWER PLANT

摘要

PURPOSE: A device of opening and closing a control valve for testing a valve performance of a safety valve of a nuclear power plant is provided to open and close a control valve rapidly by installing an additional high speed valve opening and closing controller. CONSTITUTION: A valve unit comprises a valve (120), and a valve actuator (110). A high speed valve opening and closing controller (200) performs an initial opening and closing operation of the valve for a fast time. The high speed valve opening and closing controller provides an air pressure to the valve actuator rapidly. The speed setting unit controls a switching speed of the valve actuator. The switch (220) blocks an operation of the high speed valve opening and closing controller.