Air delivery valves; Air switching valves; Compressed air pilot valves; Control valves (parts of machines); Control valves being pneumatic apparatus; Electric valves (other than thermionic); Electromagnetic valves; Mechanical control valves; Motorised valves; Pneumatic actuators for control valves; Pneumatic control valves; Pressure valves (parts of machines); Regulating valves (parts of machines); Stop valves of metal (parts of machines); Stop valves of plastic (parts of machines); Valve actuators; Valve diaphragms; Valves (parts of machines); Valves for compressors; Valves for measuring fluid flow; Valves of metal (electrically operated); Valves of metal (parts of machines); Valves operated automatically by pneumatic control; Valves operated by changes in pressure