... ,heating,etc. 4.Opening/closing tests:10000 time Features: Ball valve are bottom loaded stem designed, this anti-blow-out stem ... Seat Ring Teflon 5 Stem C37700 6 Packing Rings Teflon 7 Washer C37700 8 Handle Steel & Aluminium 9 Nut Steel Structure ... , Greece, Sri Lanka,Syria,Tunisia,Mauritius,Algeria etc. brass ball valve/Lockable Ball Valves full flow/flat lever Handle/1/4 ...