Valves, namely, valves for controlling the movement of gas, liquid, air or other media via trim motion, dump valves, motor valves, throttle valves, control valves, shut-off valves, back pressure valves and pressure reducing valves; level controllers, namely, instruments for maintaining and controlling liquid level or interface level in a vessel, automatic liquid-level control machines and instruments, and safety level valves for liquids; pressure relays, namely, pressure measuring apparatus, pressure controllers for controlling the pressure of liquid, semi-liquid and gaseous substances in industrial processes, pressure test connectors for testing pressure of fluids in hydraulic or pneumatic systems, high and low pressure shut-ins, and instruments for sending pressure signals to valves for controlling or providing a pressure signal in use with gas, air and liquids; pressure regulators, namely, pressure measuring apparatus, pressure controllers for controlling the pressure of liquid, semi-liquid and gaseous substances in industrial processes, and instruments used for maintaining a constant upstream or downstream pressure and for regulating pressures for gas, air and liquids; level switches for monitoring and controlling liquids and tanks and vessels.;