Adjustable valve, in particular a recirculation valve for a turbocharger

摘要

An adjustable valve comprises a valve member ( 6 ) for controlling the fluid flow through the valve and a coil spring ( 11 ) acting on the valve member and being supported on an adjustable retainer ( 7 ) threaded into the spring. The spring is threaded on the retainer ( 7 ) by means of a portion ( 12 ) of a reduced diameter so as to adjust a calibrating pre-tension of the spring acting on the valve member ( 6 ).