Bürkert SYST 5281 AFFNM86 Solenoid Valve 12VDC

Bürkert Type 5281 servo-assisted 2/2-way diaphragm valve (SYST 5281) is a compact, servo-diaphragm solenoid valve designed to shut off or dose neutral media with a push-over actuation and a damped closing action. It offers NC or NO circuits and is available with brass or grey cast iron bodies, with port sizes up to DN 50, making it suitable for medium-pressure process plumbing and instrumentation tasks. In Bürkert's catalog the Type 5281 family is documented as discontinued since March 31, 2016, with the 6281 series listed as the modern successor; older article numbers such as 139322 and 501867 are shown as not available, though spare parts kits may remain. The valve can be integrated into automation setups with accessories such as Timer Unit Type 1078 and Cable Plug Form A Type 2508. Ex variants exist for hazardous environments and the 5281 is specified for neutral media, reinforcing its role in precise dosing and shut-off in industrial water, air, or chemical handling circuits. As a legacy design, it remains a reference point for compact, servo-assisted control where reliability and repeatability are required across installation sizes and mounting configurations.