English to Italian Tech/Engineering Other

The shell-body adopt aluminum alloy die-casting, **machinery types** seal device, and the material of moving ring is ceramics, and the material of static ring is graphite, so this machine is compact in structure, light in weight, small in size and beautiful in appearance, convenience for operation, easy maintenance, and able to stand wear and tear.

Si parla di motopompe.
Trovo varie volte "machinery-type" come aggettivo, ad esempio in questo caso riferito al dispositivo di tenuta, ma non so come renderlo...
GIA