... 6A. Gate valves manufactured by our company are available in pressure ratings from 2000psi, 3000psi, 5000psi, 10000psi and 15000psi, ... available in 2000psi, 3000psi, 5000psi, 10000psi and 15000psi working pressure, material classes from AA through FF, product specification levels ( ... open of the valves is completely known .Note:Under pressure, the valve is forbidden to be semi-opened, for it will ...