NOVA SWISS needle valves afford a maximum of safety and reliability, even under adverse operating conditions. The valves can be installed in either direction and will effectively seal both gaseous and liquid media. The heart of the valve is the specially shaped seat and the two-piece non-rotating stem. The longevity and dependability of the valves are increased by the fact that the stem will not seize against the seat. Pressure-containing parts are made of high-grade corrosion- resistant stainless steel.