These valves are used to open and close oil paths. Because they are poppet valves leakage is extremely small with no worries about hydraulic lock.
C (cartridge type), T (threaded type), G (gasket type)
None, 03 (3/8 BSP), 03W (1/4 BSP)
D24 (24vdc), A120 (120vac), A240 (240vac), D12 (12vdc), R100 (100vrectified), R200 (200vrectified)