Valve bonnets provides a housing and guide for the trim. The bonnet also carries the trim packing and mounts the actuator.
Selection of the bonnet will depend on the type of packing, the medium and the operating temperature of the control valve. For high temperatures a cooling fin or extended cooling fin bonnet is available. For low temperature cryogenic applications, a 14” extended bonnet will be required. For leak-free pressure or vacuum applications a bellows bonnet is available.