Needle Valves

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What is A Needle Valve ?

- Needle valve is specialized valves used for metering fluid flow. Their use is primarily limited to small systems such as instrumentation or fuel regulation where the ability to control the flow of fluid precisely and repeatably is highly desirable. Needle valve is available in two main body configurations.

- Needle Valve with name of Vietnamese is Van Kim ( Van Kim Là Gì ) it is a gate valve style has gate (disc) is piston with screw. A Needle Valve allows precise flow regulation, suitable for low flow requirements.

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Technical Needle Valve

- Product Name: Needle Valve

- Size for piping: DN3, DN4, DN5, DN6, DN8, DN10, DN15, DN20, DN25, DN32, DN40, DN50

- Pressure range: 0.6MPa - 16MPa

- Materials of Needle valve: SS 201, SS 304, SS 316 / 316L, A105, WCB, 0Cr18Ni9, 1Cr18Ni9Ti, 06Cr19Ni10, etc.

- O-ring and Gasket: Soft metal, PTFE Gasket

- Working temperature range: 250 độ C

- Media Working: Water, Oil, Gas, Acidic and alkaline media such as liquid, etc.

- Size of Needle Valve : 1 inch = DN25, 6 points =3/4=DN20, 4 points =1/2=DN15, 3 points =3/8=DN10, 2 points =1/4=DN6

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Operations of Needle Valve

Operations of Needle Valve

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Advantages of Angle Seat Valve

- The needle valve advantage is from the vernier effect of the ratio between the length of the needle and the diameter of the needle, or the difference in diameter between the needle and the seat. A long vertical stroke (control input) produces a very small and precise change (affects the resulting flow).

- Needle valves can also be used in vacuum systems, where precise control of gas flow is required, at low pressures, [1] such as when filling vacuum tubes filled with gas, gas lasers and other equipment. similar.

- Automatic liquid needle valve on a liquid handling system.

- Needle valves are commonly used in flow measurement applications, especially when maintaining a steady, calibrated, low flow rate for a period of time, such as idle fuel flow in a carburetor.

Defect of Angle Seat Valve

- Since the flow rate is low and many turns of the valve body are required to open or close completely, needle valves are not used for simple shut-off applications.

- Unlike ball valves or float valves. It is difficult for the needle valve to recognize the opening and closing status through the position of the handle.

- Note that the carburetor float valve (which controls the fuel level in the carburetor) is not a needle valve, although it is often described as one. It uses a blunt conical needle, but it sits on a square chair rather than a matching cone. The intention here is to get a well-defined seat between two narrow mating surfaces, creating a steady flow from only a slight buoyant pressure.

- Needle valves are also commonly used to shut off power to pressure gauges or on nozzles to shut off the supply of NH3 to the knife in anhydrous ammonia (NH3) applications.

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Mua Van Kim VINDEC

- VINDEC là địa chỉ phân phối VAN KIM uy tín tại Việt nam có thể làm hài lòng khách hàng với năng lực đội ngũ nhân viên có kỹ thuật trình độ kỹ thuật cao, được đào tạo chuyên nghiệp bài bản của hãng.

- Quý khách hàng có thể tìm kiếm hoặc Download về máy Catalogue của hãng tại Website của chúng tôi với thông số kỹ thuật rõ ràng chính xác nhất của hãng tại: VAN KIM

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