Fluid valves for industrial use (parts of machines); manually operated valves (parts of machines); pneumatically operable valves; slide valves (parts of machines); valves (mechanical) for regulating fluid flow; valves (parts of machines); valves of metal (electrically operated); valves of metal (parts of machines); valves of metal for industrial installations (parts of machines); valves of metal for piping (parts of machines); valves operated automatically by pneumatic control