The spherical lateral expansion joints are constructed with multi-layer bellows made of stainless steel AISI 316 or 321, with different number of walls depending on the nominal pressure PN and connected in standard execution, with welded sleeve (SM) or fixed flanges (SF) painted carbon steel (on request with intermediate tube and terminals in stainless steel). These expansion joints are designed to absorb lateral races on all floors, being the equivalent of two cardan joints working in synergy. We can provide certified compensators in category P.E.D