Needle type valve used for controlling velocity accurately. They will serve as a reliable shut-off valve. The common specifications from 1/8 & quot; To 2 & quot; 。 Adjustment is a gradual and smooth. One drawback is in relatively large pressure drop needle valve. Product features 1, needle valve used for precise control of flow rate, but also can be used as a reliable shut-off valve. 2, the most generally, needle valve is a manual operation, but they can be mobile, to allow for automation. 3, the main selection criteria are: pressure, volume, temperature, and materials. 4, a fault is in relatively large pressure drop needle valve. The function of the needle valve type needle valve has needle thread plunger shape cone tip. The tapered end can locate in the conical seat. Through the rotating screw plunger tapered end just stay away from the conical seat. Thus, the valve open and so the velocity can be accurately controlled in maximum and zero. In most cases, the inlet and outlet port is coaxial to each other. However, different valve structure. They are often manually or motor allows automated. Selection criteria pressure: pressure is an important factor, choosing the appropriate needle Industrial Valves. Can handle up to 4000 - solid 5000 pounds per square inch ( 413 bar) 275 - 100° F( 38° C) 。 Still need to high pressure, the valve can be configured performance is high, able to handle up to 10000 psi ( 689 bar) In 100 & deg; F( 38° C) 。 Size: needle valve is a wide range of size and end connection. Male/female connection metric thread per inch. The most commonly used valve size from 2 to 12 mm or 1/8 & quot; To 2 & quot; 。 Use the correct valve in promoting the efficient operation of the small size and flow system of the wear and leakage. Temperature: the needle valve can operate at high or low temperature. In extreme temperature/seal when using special related packing. The two most commonly used packing materials are PTFE ( Ptfe) Temperature range for - 65° F - 450 & deg; F ( - 54° C - 232 & deg; C) And PEEK ( Poly (ether ether ketone) The resistance of the temperature rise to 600 & deg; F( 315℃) 。 Materials: the structure of the many different materials used in the valve. In the presence of commonly used materials include brass, 304 or 316 stainless steel, carbon steel and alloy, nickel base alloy, 400). 。 Stainless steel is widely used corrosion resistance, high chemical stability and heat resistance. High temperature applications in use brass hydraulic system, and the gas pipeline. Alloy 400 is the use of its high strength, corrosion resistance, mainly used in Marine and chemical processing applications.
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