A control valve consists of various components that contribute to achieving the desired flow rate. However, almost all the flow control valves have the same components. They work collaboratively inside an electronic controlled air valve to deliver the expected results. Let’s take a look at the following components of a flow control valve.


The body of the valve is also known as the shell. It is the main part of the valve because it is responsible for holding all the parts together. The body of the air flow control valve also serves as the first resistance in reducing pressure. The pipes are connected to the inlet and outlet ports of the regulator. Today, valves come in various shapes. But a sphere or a cylinder shape is more effective in controlling the flow and pressure.  


The cover that opens and closes the valve body is called the bonnet. The body is split into two sections and both of these sections are bolted together. In some valves, the bonnet only works as a cover but in some, it functions to support the other parts of the valve to perform better. The bonnet is the second pressure boundary of the electronic controlled air valve. 


All the internal components of a valve are considered as valve trim collectively. The trim of the flow valve consists of a disk, stem, seat and sleeves. The performance of a valve depends upon the disk and seat. It can be easily determined by seeing the relationship between the position of the disk and the seat of the valve. In a rotational trim, the disk of the valve slides slowly from near the seat so that a change can happen in the flow of the fluid. But in the case of the motion trim, the disk goes perpendicularly away from the seat to form an annular orifice. 

Disk and Seat

The disk is an essential component of the pneumatic flow control valve that has the ability to permit and restrict the flow. When the disk is closed the full pressure is applied on the disk. Meanwhile, the disk is the main pressure-retaining component. It’s crucial to have a fine surface for the seating of the disk so that good sealing can be achieved after closing the valve. The main purpose of the seat and seal rings is to provide a good seating area for the disk. 


The stem of an electronic controlled air valve connects the actuator and the disk and is responsible for the accurate positioning of the disk. It’s crucial for the stem to be flexible so that the disk can easily position itself. 


The actuator is responsible for operating the stem and disk. An actuator can be a hand wheel, manual lever, motor-operated etc. In some of the proportional air valves, the bonnet supports the actuator and in some, the yoke supports the actuator which is mounted on the bonnet in some designs. 

Valve Packing

In most of the valves, packing is used to prevent the chances of leakages. A fibrous material is used for the packing of the valve that can form a good seal between the components of the air flow valve. It’s necessary for the packing to be compressed to avoid leaks, loss and damage. If the packing will be loose then the valve will start leaking and if it will be too tight, then it will make the movement difficult for the internal components and will raise the chance of getting the stem damage.

Final Words

The efficient and collaborative working of valve components has made them an ideal choice for various pneumatic systems and equipment. The above-listed components work accurately and contribute to enhancing the performance of the electronic controlled air valve.