Sanitary butterfly valve(ISO9001:2000,CE,TUV certified) DN10-DN200,1/2"-8", ... ,SS304L,SS316,SS 1.Description of Stainless steel german butterfly valve (1)Surface treatment: mirror polished 320G,400G or matt polished ... close). Compact appearance, small volume, large torque, small and convenient assembly. 3) Electric: With on-off indicator light, passive contact signal ...