Needle valve

needle valve

                   Needle valve 

What is a needle valve?

Needle valve, as a member of huge valve family, has been playing a vital role at gradually and ultimately closing off the flow. Various needle valves are used to regulate the amount of substance released by force, flow, and direction. So, they are indispensable parts of most industrial process. The specific part in the value itself is the richly designed structure, adding the design of the point.

Actually, the design of the many parts of the needle valve has done remarkable favors. At this moment, take parts known as the valve stem and steal for example. No issue what, these fittings are making contributions to the performance of the full equipment.

The needle valve stem is the important part of the valve itself. It is specifically designed to make sure a precise flow control. Different valve stems are generally designed with the think threads. Generally speaking, the most general types are the threads in coarse, fine, non-wetted and wetted style. These 4 types hold their own benefits. For example, fine threads are capable to be spaced closely with the thin look, leading to the exact flow control in the minimal amounts. And coarse threads are the threads which are used to take out the highest flow. Besides, the wetted stem threads and non-wetted threads change on the point whether they are exposed to the fluid or not. All in all, they are capable to provide right flow control.

And the seal is also the indispensable part of the needle control device. If the seal is not best enough, the full equipment would outcome in bad performance, even in failure to work. Actually, there is also some accessible types of the seal. It usually has 3 types. There are the type in plastic to meal, metal to metal and metal to plastic. Each type has its remarkable specs. For example, the plastic to meal seal is pretty famous in gas molecules resulting from its respected scalability and reliable tightness.

How does a needle value work?

The general needle valve working principle is that a needle is withdrawn or depressed from a pipe to either limit or enable the flow of gas or liquid via the tube in question. Let’s take a closer look at how this process works.

The needle value, while it contains of a full host of intricate pieces that fits combine, works primarily because of the 2 big components called as the needle and the seat. The needle is, definitely, the conical-styled that is either depressed into or pull back from the channel to manage flow. The seat is a term for the area where the needle get into the channel via which the liquid or air is flowing. In other words, the seat is the area into which the needle enters.

Seats and needles are designed to be right fits to one another. This means that when the needle is put into location and has been completely depressed, there will be no air gaps at all for any liquid or gas to escape. They are the best size, and this is intentional.

At one end, the needle will generally have what looks like a handle. This is a bar which the user can simply grasp, and this piece is called as the stem. If the needle were to be fully removed, the full piece would look like the capital letter T. in a needle value diagram, this will be the initial piece you can view.

On the other end, the control device fits into the place and is threaded like a screw for simplicity of work. For the needle control device to job, the user will turn around the stem, happily gripping the handle for simplicity of regular change. As the needle rotates, the threaded parts turn, and the needle is also raised out or lowered of the seat. For the reason of the threading, the right change in needle strength for every turn is very minimal. This permits for highest accuracy, as the needle can be lowered or raised by the tiniest of degrees.

Type of needle valve

As manually operated threaded needle control device is the most general type of needle valve. Anyway, 2 additional variants are: angle and motorized.

Motorized needle valve

These needle valves do not have a grip for manual operation, but instead use a pneumatic or electric actuator to link to and start the plunger. These can be slightly managed, used in a blocked loop structure, and/or place on a timer to rightly manage to flow rate slightly.

Angle needle valve

These needle control devices start the output from the cove by ninety degrees instead of in-like. The same operation idea applies, but the ninety degree angle can permit for excellent integration.

Needle valve selection-material-pressure rating-port and orifice size-temperature.


Under the application needs for force in your system is vital for picking the right needle control device. Robust needle control devices can manage force of up to 4,000 to 5,000 psi at 100F. when highest forces are needed, like for high force hydraulic applications, high control performance devices are accessible that can manage up to ten-thousand psi force at 100F. Unique designs are also accessible when you need a vacuum need control device to handle the low force.


Needle control devices are perfect for low or high temperature applications. You need to specify the value housing and sealing/packing material rightly, especially for high temperatures, to make sure it can withstand the needs. The 2 most general sealing materials are PTFE for a temperature range of 65°F to 450°F and PEEK for raised temperature resistance up to 600F.

Port & orifice size

Needle control devices are accessible in a big orifice sizes  and range port. The link ports can also be female or male ends. General thread averages used are NPT, BSP, or metric. The most generally used needle values range from two to twelve mm or 1/8 to 2. Ensuring the right orifice size or port size will make sure efficient flow and system work will less chances of wear and/or leakage.

Specs of KP-LOK needle valves

Material :Carbon steel A105,Stainless steel 304SST,304LSST,316SST,316LSST, Alloy 400 and C-276,DUPLEX

1/8″ to 2″ with high pressure rating 2,000psi to 20,000psi Non-rotating metal stem tip,locking devices anti-tamper

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