Valves are products that are rarely noticed, yet they play a vital role in our daily life. Each time you turn on a water faucet or a gas range, or use your water heater, you operate a valve. Valves help preserve our quality of life by controlling flow of all types. They are essential to our homes and to virtually all manufacturing processes, as well as every industrial plant and system. There are a large variety of valves and valve configurations for a wide variety of purposes and conditions: different uses (on/off, control), different fluids (liquid or gas; combustible, toxic or corrosive), different materials (metal or nonmetal) and different pressure and temperature conditions
(low, medium or high pressure applications and low-, room- or high-temperature applications).
Gate Valves
Gate valves are general service valves that can be made in a broad spectrum of sizes using a variety of different materials. They can meet the demands of a wide range of pressure and temperature conditions.
Globe Valves
Globe valves are named for their appearance. Compared to gate valves, globe valves are designed to open and close more quickly. Their flow characteristics are changed by configuring their discs.
Check Valves
Check valves are designed to prevent backflow by constantly keeping fluid flowing in a single direction
Ball Valves
Because of their excellent operating characteristics, ball valves are used for the broadest spectrum of applications and are available in a wide range of sizes and materials.
Butterfly Valves
Compact and with a simple construction, butterfly valves facilitate easy pipe arrangement.
Λ Port Valves
Lambda port valves are characterized by their specially designed lambda-shaped edged discs. They are primarily used in processes to control slurries, highly viscous fluids and fibrous fluids such as pulp and paper material.
Strainers
Strainers use a screen to filter pipeline debris such as scale, rust and other foreign matter suspended in flowing liquids or gases.
Characteristics of Valve by Type
Item
Gate Valve
Globe Valve
Ball Valve
Butterfly Valve
Disc position when opened completely
Fluid does not remain
in flow passage
Fluid remains in flow passage
Fluid does not remain in flow passage
Fluid remains in flow passage
Disc actuation
Linear
Linear
Rotary
Rotary
Manual mode of operation
Round handle
Round handle
Lever handle
Round handle
Lever handle
Gear operated
Automatic mode of operation
Pneumatic /
Electric actuator
Pneumatic /
Electric actuator
Pneumatic /
Electric actuator
Pneumatic /
Electric actuator
Application
On-Off
On-Off control
Automatic on-off types
can be controlled
Automatic on-off types
can be controlled
Operating temperature range
Wide
Wide
Narrow
Narrowest
Operating pressure range
Wide
Wide
Slightly narrow
Narrow
Face-to-face dimension
Long
Longest
Long
Short
Weight
Heavy
Heavy
Heavy
Light