Valve having diameter-reducible joint part, joint for diameter reduction, and plumbing system using these

摘要

A valve having a diameter-reducible joint includes a diameter-reducible housing having a flow path therein and accommodating a seal sleeve formed of rubber, a valve mechanism provided with a valve element and built in the housing to enable switching of the flow path and controlling of a flow rate, and a junction pipe having a junction end joined with the seal sleeve to the diameter-contracted joint in a tightly sealed fashion through diameter reduction of the housing. A plumbing system comprising a pipe that has a terminal and a valve which comprises a diameter-reducible joint part having diameter-enlarging and -reducing functions, a housing having one or both joint portions enlarged and reduced in diameter to join the pipe thereto and a disc disposed within the housing and which is attached to the terminal of the pipe.