Manufacturer: Nakakita Seisakusho (Japan), marine and process automation components supplier.
Model: NS705-D-A, part of the NS705 intrinsically safe solenoid valve series used on cargo and ballast systems (e.g., BAV7 remote operated valves).
Coil supply: DC 4.5 V, current 55 mA (very low-power intrinsic safety rating).
Object gas: coded as “2G4”, indicating suitability for explosive gas atmospheres with appropriate barrier.
Typical weight: around 6.7–6.8 kg for the complete valve assembly.
Intended for intrinsically safe control circuits in hazardous zones such as tanker cargo areas and marine engine rooms, usually operating remote-operated cargo or ballast valves.
Designed so that under fault conditions, electrical energy in the coil and associated wiring cannot ignite the specified gas atmosphere when used with approved Zener/galvanic barriers.
Label explicitly states that no modification of circuit or construction is allowed, so it must be wired exactly as per Nakakita’s intrinsic safety control diagram using certified barriers.
Replacement units are generally supplied as complete valve bodies with dual solenoid coils (as visible in your photos) and DIN plug connectors, typically for panel or manifold mounting on ship systems.
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