According to pressure and temperature, how many types of the valves

Valves are classified by pressure vacuum valves - Valves whose working pressure is lower than standard atmospheric pressure. Low pressure valve - valve with nominal pressure PN less than 1.6Mpa. Medium pressure valve - valve with nominal pressure PN 2.5~6.4mpa. High pressure valve - valve with nominal pressure of pn10.0~80.0mpa. Ultra high pressure valve - a valve with a nominal pressure PN greater than 100MPa. High temperature valves classified by medium temperature - Valves greater than 450'c. Medium temperature valve - 120'c ≤ t ≤ 450'c valve. Normal temperature valve - -40'c ≤ t ≤ 120'c valve. Low temperature valve - -100'c ≤ t ≤ -40'c valve. Ultra low temperature valve - valve less than -100'C.