... international standards ISO5211 and DIN3337(F03-F25).Pneumatic three-piece ball valveModel : ZTQ61(6,8,2)F (N, P, H, Y ... , CF3, CF3M)Seat material: PTFE, PPL, N, H, YMode of action: double-acting, single-acting (spring reposition)Control: Switch , Adjust .Selection ...