The High Pressure Stop Valves are designed to seal the flow on the outlet side of the valve.
Wells High-Pressure Stop Valves
A range of hand operated stop valves for high pressure gases and liquids covering sizes from 6.35mm to 38.1mm (1/4″ to 1.5″) diameter. For the small orifice sizes a simple screw-down unbalanced seat is used. Where the combination of size and pressure would give unacceptable spindle loads a partially balanced, or fully balanced seat is employed