4-port, spool type, solenoid operated, directional control valves with wet armature AC or DC coils and wide variety of spool types with spring centered and spring-offset arrangements. Five chamber body and spool design to facilitate high flow. Conforms to ISO4401-5, NFPA T3.5.1M R1 and ANSI B93-7 D 05 interface. Available in 52 standard, interchangeable spool configurations. Removable wet-armature AC and DC solenoids for quick replacement and conversions. Moulded solenoid coils to protect against moisture and ingress of dust. Individual solenoid plug-in connectors with indicator lights to ISO 4400 and DIN 43650. Special R-rings for high extrusion resistance. Increased stability under high dynamic condition. Override for operation of valve without electrical power. Note on solenoid identification : Solenoid "a" is close to Port "A" and Solenoid "b" is close to Port "B" for a direct operated valve.