Castel supplies to its customers the permanent magnet
code 9900/X91 for the normally closed solenoid valves,
shown in this chapter.

This product can be used during brazing of the valve
copper connections to the plant pipes; slipping it on the
armature, instead of the coil, it allows the protective gas
(nitrogen) flowing and avoids any damage to the plunger
gasket and to the diaphragm.

CONSTRUCTION

The main parts of the permanent magnet code 9900/X91
are made with the following materials:

• three rings of anisotropic ferrite
• anodized aluminum for the body