Needle valves

Needle valves

What are needle valves?

Pipe systems need to regulate the flow of fluids as necessary. There are different piping components that help to achieve this. Valves are essentially the most efficient components in doing so. Out of the different valves, this valves are some of the best for accurate flow control. The valves come in sizes ranging from ⅛ inches to 2 inches normally. According to the requirement of the piping system and the fluid in the flow, the sizes may vary. The plunger in the needle valve, or the needles is raised and lowered using a stem. The needles sits in a seat to close the flow and rises to open the flow. With the minimal area of the needles, the flow control can be very accurate.

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Needle Valves Specification

Needle Valves Material

Hydraulic needle valve suppliers in UAE

Do needle valves affect pressure?

However, the needle valves still have to sit in the middle of the flow. When they are halfway open, they are susceptible to the pressure of the flow. The Hydraulic needle valve has to absorb the stress and force and stand in place. If the plunger is exposed to too much force, it can bend over time. In pressure fluid flows, the needles has a very minimal surface to impact the pressure of the fluid. The surface area is also cylindrical, which has a very minimal impact on the pressure. Therefore, they can be used in gas systems as well. The propane needle valve is an example of needle valve application in high precision systems.

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How do you test a needle valve?

As needle valves are used mostly in engines and fuel systems, valves failure can be seen in overflow systems. If the Industrial needle valves don’t function properly, then the overflow pipes will have more fluids than expected. The best way to test a needle valve is to apply air pressure to the pipeline and see if the air leaks. But you have to be careful not to apply high pressure to the Needle control valve. 3-5 psi of pressure is enough to test most valves. As you apply pressure, move the stem to raise and lower the needles. You can inspect at the closed position if the valve is leaking air or not.

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Do needle valves have a flow direction?

Yes, the High pressure needle valve has a desired flow direction. Although the valve can facilitate flow in both directions at lower pressures, there is always a preferred direction of flow for needle valves. This is because, inside the orifice, the valve plug sits inside the body with a tapered end. The flow inside the Pneumatic needle valve or any other needle valve is usually upright through the seat. This would allow the pressure to not damage the needle. If the flow is in the opposite direction, the tapered shape will have pressure applied from the other direction which can cause turbulence at high pressures.

High pressure needle valve manufacturer & supplier in middle east countries, propane needle valves are manufactured in forged & cast methods in custom sizes

Can a needle valve stop flow?

Yes, the needle valve can stop the flow better than most other valves. The Angle needle valve and other types of needle valves have their valve tips shaped in a way that it can accurately shut down the flow by tightening with the valve seat. Therefore the Motorized needle valve is designed to shut down the system perfectly if needed or to regulate the flow as desired. In fuel injection systems, the needle valve has to shut down and open in perfect timing with high precision in shutting down and opening up.

Needle control valve as per ISO10434, API603, API6D, API602, API600 Testing criteria, check specification and price list

What is the advantage of needle valve?

A needle valve is used in metering devices because they have high accuracy. It can be used in vacuum systems where the needle valve sits in between a vacuum and a gas atmosphere and can release the gases without much pressure. Due to their high efficiency, the valves can be used in monitoring fluid flow, like in the propane gas transmission lines. There are customized valves such as the 3 way needle valve which can be used to direct the flow in multiple directions or to regulate the flow within multiple lines of fluid flow.