Know about needle check valves & the purpose of using them

Control valves help in regulating pressure and flow rate automatically. It depends on the type of water transmission or distribution systems. The reason for using such valves is to modulate the fluid flow through the plug movement. Controlling or regulating the flow of movements is important in such industries. There are different types of control valves used throughout the globe such as needle control valves. Stay with us and go through this article to explore a lot more about needle control valves.

What are control valves and why are they used?

Water distribution or transmission systems contain loads of control loops that are connected. Every control loop is especially constructed for keeping a few vital procedure variables such as flow, pressure, level etc. in the needed operating range to guarantee the products’ quality. Each loop produces some disturbances which can affect the loop’s interaction and process variable. All this information is then prepared through a controller that decides what has to be done for getting the process variable again. After all these measurements, calculations and comparisons, some kind of last control element needs to be implemented. Control valves are the final common element in various process control sectors. Control valves help in manipulating or regulating the fluid flow which compensates for the load disturbance and thus keeps the whole process regulated.

What are needle valves?

Do you know how needle control valves got their name? The needle control valves have got their names due to the narrow type tapered plug as well as the port arrangement. Needle control valves are usually compact and through this type of valve, you can easily control the flow of fluid accurately. These valves can be used even if the fluid flow rates or pressure heads need to be controlled or reduced safely. Needle control valves have the capacity of controlling the fluid flow and pressure. Needle control valves are also called – “linear motion valves”. Mostly, you can see the usage of needle control valves for the throttling of small fluid volumes in instrument systems. Needle control valves consist of meta-metal seats, due to their small size, these control valves can also be used efficiently for “positive shut-off” operation. Needle control valves can control the fluid volume. You can control the intricate gauge flow which can be easily controlled by the needle control valves otherwise it could have been damaged by surges of fluid flow under pressure. So, the needle control valves are used where precise fluid flow control is required.

What is the construction of needle control valves?

Needle control valves contain a valve body which has a tapered stem as well as an orifice. You can screw in or out the valve body in order to vary the opening of the orifice. In both directions, the fluid flow can be obstructed through the aid of needle control valves. Generally, the preferred direction of fluid flow is shown through an arrow present in the valves’ body & when the fluid flows in this direction, the pressure loss will be much lesser across the needle control valves. Needle control valves come with internal check valves that permit the obstructed fluid flow in one direction but let the fluid flow in another direction. These valves use the stem to change orifices’ size. It will give the ability to compensate for the applied changes in different pressure for maintaining the continuous fluid flow rate via needle check valves & actuator speed. It will allow you to easily establish the needed rate of fluid flow but without removal of the orifice.

The body of needle control valves is generally made of bronze, brass, stainless steel and various other alloy materials. The valves’ seats are constructed with PVC, Plastic, CPVC, thermoplastic materials etc.

Dutco Tennant LLC is going to present a wide range of innovative products ideal for your potable water project needs at the WETEX exhibition 2022. If you are thrilled to know more about needle control valves then come and visit us at Hall: H7, Stand no. 7B12 from 27th September to 29th September.

How do needle control valves work?

The spindle of needle control valves stops in the tapered needle, it will proceed into the valve seat to avoid or restrict the fluid flow. Both in & out motion of the needle control valves from and to the valve seat is controlled through the spindle that is operated via handwheels. The particular fluid turns ninety degrees which move through the needle control valves and passes by an orifice. The plunger (needle-shaped) is present at the screws’ end. When you turn the screw, the plunger is withdrawn, and fluid flow between the seat and plunger is possible. A few stems are threaded properly and have linear movement, so that several turns are required for a complete fluid flow section. It makes the needle control valves best for fluid flow regulation. You can consider needle control valves as tiny globe valves. It is a kind of globe valve which you need to use for low fluid flow.

What are the different types of needle control valves?

There are three types of needle control valves used majorly for multiple applications:

  1. Manual Threaded needle control valves – These types of needle control valves are operated manually.
  2. Motorized Needle Control valves: These types of needle control valves use a pneumatic or an electric actuator to operate.
  3. Angle Needle Valve: angle needle control valves turn the output 90 degrees rather than in-line.

What are the major applications for needle control valves?

Have a glance at the applications for needle control valves:

a) Needle control valves are used on various gas bleeder lines.

b) These valves are used for several sampling lines as well as many other services related to abrasive fluids.

c) They are also used in metering applications.

d) Automatic combustion control systems also use needle control valves where precise fluid flow regulation is required.

e) Needle control valves are also in continuous pressure pump governors to lessen the fluctuation effects.

What are the advantages of using needle control valves?

There are advantages to installing needle control valves. They are:

> Free of corrosion – One of the best features of needle control valves especially of stainless steel is the resistance to corrosion

> Offers leak-free performance – Another biggest advantage of using needle control valves made from stainless steel is a leakage-free hydraulic system.


So, it was all about needle control valves. If you want your potable water system project to regulate the fluid flow then, needle control valves are the ones. The best feature of needle control valves is the inclusion of a plunger which guarantees smooth fluid flow. you can get in touch with one of the trusted suppliers of control valves in the Middle East and GCC region.

Dutco Tennant LLC will be showcasing top-notch solutions perfect for your potable water transmission system needs. Why don’t you come to the WETEX exhibition 2022? If you are interested then meet us at Hall: H7, Stand no. 7B12 from 27th September to 29th September 2022.


Dutco Tennant LLC has been a leader in supplying various kinds of industrial and engineering solutions for diverse industry verticals from construction to networking to electrical and we established a good company profile. Dutco Tennant LLC supplies products to a high-status list of corporate and government projects, and has contributed to the creation of world class private and public infrastructure such as water and wastewater projects, airports, exhibition centers, shopping malls, networking infrastructure, hospitals, hotels, universities and offices around the Middle East and GCC region.

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