Geschraubte Krone mit Ventil oder integriertem Druckschalter

摘要

The crown has a cylindrical head (2) integrated with a central rod (3). The head is equipped with a threaded part (2.1) at its internal circumference. An auxiliary rod (5) is housed in a fixed tube (1) in a sliding and rotative manner, and partially surrounds the central rod. The central rod is housed in the auxiliary rod in a sliding manner. A pretensioning spring (6) is arranged in a hollow space formed in the cylindrical head to apply pretensioning force on the auxiliary rod.