The Edwards Speedivalve (sp25k) is a diaphragm sealed in-line, isolation valve. The construction consists essentially of a flexible elastomeric dia­phragm which is sealed onto a lightly polished seat by a screw thread mechanism. The valve terminates in NW flanges and can be pipeline supported or panel mounted. Fits on all your KF25 flanges. Summit recommends these KF25 parts for this item:

Easy to operate with visual indication of valve open (SP10K to SP25K). Leak tight to better than 10-6 mbar ls-1 / 8 x 10-7 Torr ls-1. Diaphragm completely isolates mechanism from vacuum system. Will withstand 9 bar overpressure (SP10K to SP40K, with Co-Seal)