These NEW Edwards PV25MKS Manual Right Angle Lever Operation Bellows Isolation Valves are very quick acting. The lever, connected to a self lubricating plastic cam piston, actuates the valve stem and valve plate through PTFE bearings. The valve plate 0-ring groove is vented to prevent gas bursts. This valve is designed to operate down to 10-9 mbar / 7.5 x 10-10 Torr and up to a pressure of 2100 mbar / 1575 Torr (30 psi). Leak rate of < 10- 9 mbar l s- 1 / < 7.5 x 10-10 Torr l s-1. The O-Ring is Fluoroelastomer. The molecular Conductance is 0.2 l/s and the baking temperature is 100 degrees Celcius. These right angle valves function reliably in applications ranging from semiconductor manufacturing to plasma physics research to nuclear accelerators. These right angle bellows valves are primarily for vacuum processes. They are brand new and made of AISI 304 grade stainless steel.