A line of single- and double-bellows Clampseal valves allow for zero emissions. They are suitable for applications where packed valves may not reliably contain light gases or hazardous system fluids due to leakage in the stem/packing seal area or stuffing box wall/packing seal area. The valves are available in 0.5 through 4 sizes and in Y, T and angle configurations. Options include electric, pneumatic and hydraulic actuators; open, closed or both locking devices; and single- or dual-limit switches.