Controlling the flow of fluids and liquids is essential in a number of industries. Thus, flow control valves play a crucial role in these industries.
FREMONT, CA: Valves are essential across a variety of industries and applications, and there are numerous types of valves. The types of valves range from simple to sophisticate when it comes to flow control valves. Few valves automatically adjust to pressure and temperature variations depending on their complexity. The flow control valves’ primary function is to regulate the flow or pressure of fluids and valves react to signals generated by temperature gauges or flow meters. Here are a few valves.
1. Gate Valves
Gate valves are generally used for on/off, non-throttling service. Explicitly speaking, gate valves are used in applications were a straight-line flow of fluid with minimum restrictions are required. When the user rotates the stem in a clockwise to close (CTC) motion or a clockwise to open (CTO) motion, the gate valve starts functioning. It is a multi-turn valve as the gate moves up or down on the threaded step when the operator moves the stem. It needs to be turned several times to close it. When a minimum pressure loss and a free bore are required, engineers use gate valves. Gate valves are utilized for clean water, wastewater, and neutral liquids; in temperatures within -20 and 70 degrees Celsius; and up to 16 bar differential pressure; maximum 5 meters/second flow velocity.
2. Pinch Valves
When it comes to slurries or liquids containing significant amounts of suspended solids, a pinch valve is ideal. Pinch valves use rubber tubes that become pinched to turn off the flow. The rubber sleeves and their flexibility allow pinch valves to close tightly around entrapped solids. To actuate pinch valves, air or hydraulic pressure is placed directly on the elastomer sleeve. A pinch valve’s body eliminates pneumatic, hydraulic, and electric operators, which results in cost-effectiveness.
3. Needle Valves
Needle valves restrict the flow in small lines. Moving through the valve, the fluid turns 90 degrees and runs through the orifice that serves as the seat for a cone-shaped-tipped rod. When the user set the cone according to the seat the size of the orifice changes. Needle valves share a few design features with globe valves and have similar benefits. Needle valves provide positive shutoff to allow gauges and other measurement instrument installation.
4. Globe Valves
A globe valve is a linear motion valve which helps in stopping, starting, and regulating the flow. The procedure begins with a plug featuring a flat or convex bottom that is lowered onto a horizontal seat situated in the middle of the valve. Globe valves are used for on/off, and throttling applications as the disk of the valve is removable. While globe valves create somewhat more powerful pressure drops, they are appropriate in situations where the pressure drop is not a controlling agent. As the whole system pressure exercised on the disc changes to the valve stem, the effective size limit for the globe valve is NPS 12 (DN 300).
5. Diaphragm Valves
Diaphragm valves are identified as a flexible disc that touches a seat at the top of the valve body and forms a seal. The diaphragm is pressure-responsive and flexible. It applies force to open, close, or control a valve. Rather than using an elastomeric liner in the valve body, these valves use an elastomeric diaphragm. To separate the flow stream from the closure element, the elastomeric diaphragm is attached to a compressor. These valves are perfect for handling erosive, corrosive, and dirty services.
Flow control valves are essential in a number of industries as they regulate the flow of expensive fluids. However, it is critical to determine which flow control valve type is suitable according to the needs. It also depends on a host of criteria.