Manual ValveControl components in pipeline fluid transportation systems, used to alter the cross-sectional area of the passage and the direction of medium flow, with functions of guiding the flow.As of now、Adjust、ThrottleCheck valves,分流 valves,or pressure-relief valves, etc. A wide variety of valves for fluid control, ranging from simple valves to highly complex automated systems, with numerous types and specifications.Nominal Bore SizeVarying from ultra-micro instrumentation valves to industrial pipeline valves with a diameter as large as 10 meters. Valves are suitable for controlling the flow of various fluids, including water, steam, sludge, corrosive media, liquid metals, and more. The working pressure of these valves ranges from ultra-high pressures of 0.0013 MPa to 1000 MPa, with operating temperatures spanning from ultra-low temperatures of -269°C to high temperatures of up to 1430°C. Control of the valves can be achieved through multiple transmission methods, such as manual, electric, hydraulic, pneumatic, worm gear, electromagnetic, electromagnetic-hydraulic, electric-hydraulic, gas-hydraulic, spur gear, and bevel gear drives. They can operate under pressure, temperature, or other sensor signals to act according to predetermined requirements or simply open or close without relying on sensor signals. Valves utilize driving or automatic mechanisms to move the operating parts up and down, slide, rotate, or pivot, thereby altering the size of the flow passage to achieve control functions.