OPENING AND CLOSING VALVE OF CONNECTING PASSAGE FOR DIFFERENTIAL PRESSURE DETECTOR

摘要

PROBLEM TO BE SOLVED: To provide an opening and closing valve of a connecting passage for a differential pressure detector capable of being easily operated with a simple structure at a low cost. SOLUTION: A high pressure side connecting passage 2 and a low pressure side connecting passage 3 are formed in inside a valve casing 1. A first introduction and communication hole 9 and a second introduction and communication hole 10 are provided in parallel along a radial direction. A columnar cock body 8 crossing the high pressure side connecting passage and the low pressure side connecting passage is provided rotatably around an axis. The cock body usually closes the high pressure side connecting passage and the low pressure side connecting passage with a side surface thereof. When the cock body is rotated to a predetermined angle position, the high pressure side connecting passage and the low pressure side connecting passage simultaneously communicate with the first introduction and communication hole and the second introduction and communication hole respectively. Further, and equalizing passage 12 for communicating the high pressure side connecting passage and the low pressure side connecting passage is provided between the cock body and respective introduction outlets halfway the high pressure side connecting passage and the low pressure side connecting passage. An equalizing valve 13 for opening and closing the equalizing passage is provided on the equalizing passage.