STOP COCK HAVING NONRETURN FUNCTION

摘要

THE PRESENT INVENTION PROVIDES A STOP COCK HAVING BACKFLOW PREVENTING FUNCTION. A VALVE SEAT (10) IS PROVIDED AT A SECONDARY SIDE OF A VALVE PORT (6) COMMUNICATING A FLOW PATH (3) AT A PRIMARY SIDE WITH A FLOW PATH (5) AT A SECONDARY SIDE. A VALVE BODY (11) IS DETACHABLY PROVIDED AT THE VALVE SEAT (10). A SPRING (12) IS MOUNTED TO THE VALVE BODY (11) BETWEEN THE VALVE BODY (11) AND A SPINDLE (7) CAPABLE OF ADVANCING OR WITHDRAWING IN AN AXIAL LINE DIRECTION OF THE VALVE PORT (6). THE SPRING (12) IS EXPANDED OR COMPRESSED BETWEEN THE VALVE BODY (11) AND THE SPINDLE (7) IN CORRESPONDENCE WITH THE ADVANCING AND WITHDRAWING MOVEMENTS OF THE SPINDLE (7).