Types of Valves Used in Piping and How to Classify Them
Valves act as vital parts in piping systems. They appear in many industries like oil and gas, water treatment, chemical processing, and power generation. These devices manage, guide, separate, combine, or adjust the flow and pressure of fluids. They do this by changing the path inside the pipes. When fully open, valves let fluid pass freely from high-pressure zones to low-pressure zones. But when partly or fully closed, they limit or completely stop the flow.
Functions of Valves in Piping Systems
Valves carry out several main jobs. These help improve process work and guard equipment.
- Starting or stopping fluid flow
- Throttling or adjusting flow rates
- Regulating pressure levels
- Controlling fluid temperature
- Redirecting flow paths
- Balancing systems or preventing over-pressurization
- Preventing reverse flow
- Enabling emergency shutdowns during failures
- Enhancing safety by relieving excess pressure or vacuum
Common Types of Valves in Piping
A few valve kinds stand out in industrial use. The most common ones are gate valves, globe valves, ball valves, check valves, and butterfly valves.
Gate Valve
Gate valves stand as the most popular kind in process plants. A gate moves in a straight line. It usually has a wedge shape. This gate either blocks flow or lets it pass.
These valves give very good shutoff ability. They work well in many services. Examples include air, fuel gas, steam, feedwater, slurries, and thick liquids. Fluid faces low resistance. This comes from a straight flow path with almost no change in direction.
Globe Valve
Globe valves have a round body. An inside baffle splits the two halves. A movable plug and a fixed ring seat sit there. Turning the stem with a handwheel pushes the plug toward or away from the seat.
These valves fit both on/off tasks and throttling jobs. They shine where exact flow control and strong shutoff count. Common uses appear in cooling water, feedwater, chemical injection, and fuel or lubricating oil systems.
Ball Valve
Ball valves use a round ball with a hole through it. The ball turns on a handle. A 90-degree turn lines the hole up with the flow path to open fully. Or it blocks the path to close.
Benefits include simple use, large flow ability, good fit for high-pressure spots, long life, and easy seat or seal fixes while in line. Downsides include tough cleaning that can cause pollution risks. They also do not suit steady throttling.
Check Valve (Non-Return Valve)
Check valves stop backflow on their own. No outside power is needed. Forward pressure opens the valve. Reverse pressure closes it tight. Often a flap, disc, or ball does the job.
These valve without handle exists for operation. The valve works just from fluid movement and pressure.
Butterfly Valve
Butterfly valves have a disc that turns on a center shaft. One quarter-turn moves the disc. It sits flat with flow for almost full passage. Or it stands straight across to close.
Small bodies save space. They cut weight and make setup easy. This helps a lot in big sizes. High flow rates and good sealing at low pressure suit many uses.
How Valves in Piping Systems Are Classified
Valve classification helps pick the right one carefully. It looks at many factors beyond just the basic kinds.
Mode of Operation
Manual valves use hand wheels, levers, or chains. Sometimes gears help with force or speed.
Actuated valves add electric motors, pneumatic, hydraulic, or solenoid parts. These allow far-away or automatic control. They fit big systems or precise needs.
Automatic valves react to situations like backflow (check valves) or too much pressure. No human help is needed.
End Connections
Common connections make sure valves fit pipes well:
Flanged ends bolt via rim plates for easy assembly/disassembly
Screwed ends thread directly for smaller sizes
Socket welded ends insert and weld pipes for strength
Butt welded ends bevel for permanent joints
Wafer types sandwich between flanges for space efficiency
Mechanical Motion
Linear motion valves have parts that move in a straight line (gate, globe).
Rotary motion valves turn around (ball, butterfly, plug).
Quarter-turn kinds (ball, butterfly) work fast. Multi-turn kinds (gate, globe) need extra turns.
Conclusion
Valve selection needs thoughtful review of function, fluid features, how often it works, access for maintenance, and safety demands. Many designs guarantee top results in different uses.
FLUIDO, as a leading manufacturer, supplier, and factory specializing in high-quality valves including cast iron gate valves, resilient seated gate valves, stainless steel ball valves, cast iron butterfly valves, globe valves, check valves, and strainers, offers reliable solutions compliant with standards like DIN, BS, MSS, AWWA, and API.
As a trusted valve manufacturer, supplier, and factory, FLUIDO delivers premium cast iron and stainless steel valves tailored to industrial requirements.