PNEUMATIC VALVE FOR HEAVY-CURRENT SWITCH APPARATUS Russian patent published in 1994 - IPC

FIELD: electrical engineering. SUBSTANCE: pneumatic valve has ring made from flexible material with radial incisions for membrane both sides fastening between them to provide better valve workability and grater operating life. Membrane fastening in ring incisions without pinching makes material strength lower owing to incisions self-crossing so it leads to valve operating life-time growing up too. EFFECT: three times higher valve workability and grater operating life for 50% . 2 dwg