... ,10000PSI API6A ,Material Classes from AA through FF, PSL1-PSL3 SLAB GATE VALVE (NON-RISING STEM) The Non-rising stem ... slab gatevalves available in temperature classes L, P, R, S, T, ... valve and great reduce the service life of the valve. Slab gate valve,Wellheads,API6A valves, (NON-RISING STEM)