Manual control valves are used for fluid control, ranging from the simplest shut-off valves to various valves used in highly complex automated control systems. They come in a wide variety of types and specifications, with nominal diameters ranging from extremely small instrument valves to industrial pipeline valves with diameters up to 10 meters.
These valves can be used to control the flow of various types of fluids, including water, steam, oil, gas, slurry, various corrosive media, liquid metals, and radioactive fluids. Operating pressures range from 0.0013 MPa to ultra-high pressures of 1000 MPa, and operating temperatures range from ultra-low temperatures of -269°C to high temperatures of 1430°C.
Valves can be controlled using various transmission methods, such as manual, electric, hydraulic, pneumatic, worm gear, electromagnetic, electromagnetic-hydraulic, electro-hydraulic, pneumatic-hydraulic, spur gear, and bevel gear drives. They can operate according to predetermined requirements under the action of pressure, temperature, or other forms of sensor signals, or simply open or close without relying on sensor signals. Valves rely on drive or automatic mechanisms to make the opening and closing parts move up and down, slide, swing, or rotate, thereby changing the size of their flow channel area to achieve their control function.
Manual Control Valve Performance Characteristics:
1. Improved Heating Supply: Branch lines and heating points using manual control valves can adjust flow according to design conditions to achieve optimal temperature operation. This type of valve offers better regulation performance than gate valves and globe valves, exhibiting near-linear regulation. Therefore, uneven heating in various buildings is significantly reduced.
2. Energy Saving: Temperature and pressure imbalances in the heating network can cause excessive flow in some branches, leading to overheating in some buildings and forcing residents to open windows, thus saving energy.
3. Improved Hydraulic Conditions: Manual control valves can control flow according to rated flow, reducing excessive flow in the network and improving the original deterioration of hydraulic conditions.
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