... , Viton , NBR, FPM, which all confirm to standard of FDA. Connection: Weld, clamp, thread, single weld single thread, flange Handle: 2-position handle ... (manual and pneumatic) and adjustable operation as different points. 4. All butterfly valves can be installed sighed-position indicator and switch ... THE PROCESS CHART The more product model for your selection: Thread Stainless Steel Butterfly Valve