with a cut-off member rigid with the spindle, e.g. main valves

Full Title

Lift valves , i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces ( ; diaphragm valves F16K7/00) > with screw-spindle (F16K1/12 - F16K1/28 take precedence; actuating mechanisms with screw-spindles F16K31/50) > with a cut-off member rigid with the spindle, e.g. main valves