My first valve of my trumpet will not go all the way down, I can't

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How do put in the right order mixed up piston valves without any numbers on a trumpet? - Quora

One of my trumpet valves gets stuck on its way up while I blow the horn. Is this a sign of dirt build up or damage to the valve casing? What can

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The Structure of the Trumpet:How does the trumpet generate sound? - Musical Instrument Guide - Yamaha Corporation

First valve clicking? - View topic: Trumpet Herald forum