VALVES INDUSTRY – A DETAILED INFORMATION
Valves are employed in just about any situation involving the flow of liquid or gas. “The valve is one of the most basic and indispensable components of our modern technology society.”
Outside the home, industrial valves are built to handle high pressure, either from fluid or gas, and to last through years of use in harsh environments. Most utilities, from water to oil and gas, wouldn’t be able to function without heavy duty, industrial-strength valves.
Because many components of industrial valves are cast, foundries and machine valve manufacturers often supply valves with the parts they need to assemble finished products.
In general, the body which is the first pressure boundary of a valve resists fluid pressure loads from connecting piping.
Industrial Valves Working
Methodology:
It receives inlet and outlet piping through threaded, bolted, or welded joints. The disc allows, throttles, or stops the flow, depending on its position.
When the seat forms a seal with the disc to stop the flow, the valve stem provides the necessary movement to the disc for opening or closing the valve.
Most common types of industrial valves fall into one of these following main categories based on the mechanical motion of the valve:
Linear Motion Valve: There are two distinct types of linear valves: rising stem (multi-turn) and axial. While both valve types rely on the linear motion of the flow obstructer, they are very different in construction and operation.
Multi-turn (rising stem) valves: move the obstructer by the rotation of a threaded stem (rod) which is attached to the obstructer. Examples of multi-turn valves are gate valves, globe valves, pinch valves, diaphragm valves, and needle valves. These valve types are commonly used for flow control applications.
Axial valves: use pneumatic or electro-magnetic force to slide the obstructer along an axis. Some examples of these are coaxial valves, and angle seat valves. These valves are typically fast-acting and only used for on/off process applications.
Rotary Motion Valve: These types of valves rely on the rotary motion of the flow obstructer in most cases, this rotation is limited to 90 degrees (one quarter-turn), however, some valves operate using a larger degree of rotation and have more than two positions that are used in regular operation. Valves that are quarter-turn are completely closed at 0˚ and completely open at 90˚. Examples of quarter-turn valves are ball valves, plug valves, and butterfly valves.
Self-actuated valve: self-actuated valves use the system fluid to position the valve. Relief valves, safety valves, check valves, and steam traps are examples of self-actuated valves.
The following valve types represent the most commonly seen valves for industrial applications around the world:
• Gate Valves: A gate valve consists of a channel that can be opened or closed by moving a metal gate up and down. When raised, the gate clears the channel and allows flow; when lowered, the gate obstructs the channel.
• Butterfly Valves: A butterfly valve consists of a channel and a paddle affixed to the channel through its central axis. The paddle, which is often disc-shaped, can spin to obstruct or open the channel.
Ball Valves: A ball valve is comprised of a valve housing, which is often a metal casting, and a perforated ball. Actuating the valve turns the ball, increasing the flow as the perforation comes in line with the channel.
Globe Valves: A globe valve is characterized by an S-shaped channel and a horizontally oriented valve member that raises and lowers to control the flow of fluid or gas.
No matter what type of valve is being produced; the manufacturing process takes several steps. Many valve components can be cast, resulting in durable valve bodies and inner parts.
Valve Manufacturing:
In order to finish valve bodies, threads must be machined into any areas that will connect to other valve parts, or to upstream and downstream pipes.
Inner components can be produced using a variety of methods. The ball valves supplier uses the ball of a ball valve often must be machined in order to produce the smoothest, most precise spherical surface possible.
Depending on the surface finish and tolerances required, a variety of metal casting methods can be used to produce valve components. Gate valves supplier prefer valve enclosures, bonnets and other parts through shell mould casting.
Most of the Control valves suppliers use additional components through investment casting. Still more metal casting processes are used by the valve suppliers, like permanent mould casting and greensand casting, to manufacture valve system components for different applications.
Conclusion:
Fevisa being a reputed water valves supplier are dedicated to helping customers select the control valve best suited for the existing service conditions. Frequently several correct choices may be available, thus it is important for customers to provide valve suppliers with a correct set of requirements to help them get the proper valve for their usage.
