Valves operated automatically by hydraulic control; Valves for regulating fluid flow; Valves operated automatically by changes in physical conditions or by electric or electronic controllers; Valves for use with fluids, including liquids and gases for regulating flow; Valves operated automatically by changes in temperature; Magnetic and pneumatic valves, in particular for regulating the flow of fluids; Apparatus and instruments for conducting, switching, transforming, accumulating, regulating...