Pneumatic Valves

Pneumatic valve is one of a series of components, responsible for controlling the pressure and air flow in the pneumatic system. Pneumatic systems rely on the force of compressed air to transmit power, and can be found in many industrial applications such as pneumatic tool and diesel engines. Pneumatic valve can have two definitions:
 
First, a pneumatic valve is a device used to control or regulate the flow of air or gas in a pneumatic system. They do this by controlling the air (or gas) at the source and adjusting the pipes or equipment that leads to the automated pneumatic system as needed.
 
Second, air is used as the control mechanism on the valve, but the medium flowing through the valve port may not be air. The flowing objects can be air, water, oil or some other fluid. In other words, air is a control unit, not necessarily a fluid in the valve body.

Valves concept

Valves have been widely used in our daily lives. In the plumbing and tube sector, valves are generally considered to be designs or devices that regulate, guide or control the flow of fluids by opening, closing or partially blocking various channels of fluids. Generally, valves are accessories in any structure, but due to their complex and diverse types and applications, they are usually discussed as a separate category.
 
In the case of open valve, fluid flows from high pressure to low pressure. The simplest and oldest valve is just a freely hinged flap that drops to prevent fluid flow in a certain direction. The valve with this function is called a check valve, which is used to prevent the flow in one direction. Modern control valves can regulate downstream pressure or flow and achieve multiple purposes under the control of an automated system.

 

Valve structure

The most common type of valve consists of two key parts: the valve body and the bonnet.
The valve body is a casing for containing the fluid flowing through the valve. The valve cover is screwed into the casing and passes through the valve stem as a guide and seal for the valve stem. 
 
The valve body is usually made of metal or plastic, and the structure is strong and firm. Metal materials are usually brass, bronze, gunmetal, cast iron, steel, alloy steel and stainless steel. In some special environments, such as seawater desalination plants, it usually uses duplex valves or super duplex valves. In order to respond to changes in seawater temperature and complex compositions, valve body materials with corrosion resistance must be used.
 
The procedure of assembling the valve is to put the internal parts into the valve body, and then install the bonnet to fix all the internal components together. Some valves do not include a bonnet, but are combined together in different ways, such as plug valves and ball valves.

 

Comparison with air pump

Pneumatic pumps have similar concepts to air pumps used to control air flow. Below we will briefly introduce the application of air to the pump.
 
Air pumps in the pump and valve industry are defined as pumps used to push air. This is a very common device in the industry. Such as bicycle pumps or equipment used to inflate aquariums or ponds. In addition, gas compressors powered by air horns or pipe organs are in this category. All air pumps contain components that drive airflow, such as vanes, pistons, impellers, or diaphragms. The movement of air creates a low-pressure area, which is filled with more air. There are air compressors, bellows, bicycle pumps, diaphragm pumps, engine-driven pumps and many other pumps on the market.
 
Compared with other mechanical parts in the mechanical field (such as mechanical arms, ATC systems, clamps, cylinders, fixtures and other complex parts), the air pump as a pneumatic unit has a relatively simple structure and is easy to produce. These characteristics are critical to the output quality and actual operation of the air pump. 

 

Conclusion

The development and research of valve units has recently become very popular in the pneumatic and hydraulic fields because they can be widely used for various purposes in household and industrial purposes. It is recognized that through various designs on the valve unit, one can use the valve unit to accomplish many things to control many kinds of liquid substances, thereby realizing the idea of intelligent management. Compared with numerical digital systems, the mechanical based valve has relatively few parts, and of course the cost is much lower. In the near future, more valve types with innovative functions will be put on the market. These new functions will bring changes to people's lives.

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