Ball Valve Throttling

Among the most common valves, the butterfly valve is the most suitable for throttling. A full quarter turn can open or close the valve.

What is throttling in valves?

A: Throttling valves are a type of valve that can be used to start, stop and regulate the flow of fluid through a rotodynamic pump. When the flow of a pump is regulated using a throttling valve, the system curve is changed. The operating point moves to the left on the Pump curve when the flow is decreased.

Are ball valves good for flow control?

Ball valves are commonly used in flow systems across numerous industries due to their low cost, durability, and excellent shutoff capability. Similar to butterfly valves, they are not as effective for flow control applications that require a high degree of accuracy and control.

Why are ball valves not used for regulation?

Ball valves provide a quick shut-off as the ball rotates as soon as the actuator is turned. For this precise reason, they cannot be used for throttling purposes.

Can you use a gate valve for throttling?

Gate valves are not suitable for throttling volume. The control of flow is difficult because of the valve's design and the flow of fluid slapping against a partially open gate can cause extensive damage to the valve. Except as specifically authorized by the manufacturer, gate valves should not be used for throttling.

Can you use a butterfly valve to throttle?

Unlike gate valves, butterfly valves can be used for throttling or regulating flow as well as in the full open and fully closed position. The pressure loss through a butterfly valve is small in comparison with the gate valve.

Does throttling a valve reduce pressure?

Typically, there will be a higher amount of pressure on one side of the throttle valve with a lower amount of pressure on the opposite end. With a throttling valve, you're able to control the amount of pressure going through. The more restricted a valve is, the more pressure will go through.

What valves can be throttled?

The two main types of valves that we offer for throttling applications are our globe valves and our needle valves. In both these types of valves a stem is raised and lowered into the flow path and can be stopped at any point and left in that position.

What is meant by throttling the flow?

A throttle is the mechanism by which fluid flow is managed by constriction or obstruction.

How does a ball valve control flow rate?

A ball valve is a type of quarter-turn valve with a hollow ball to control flow through it. A 90-degree turn of the valve will position the ball's hole in line with the flow direction, and the reverse will completely shut-off the valve in the closed position.

Which is better ball valve or needle valve?

Applications requiring quick state modifications, such as going from open to shut or from close to open instantaneously, are better suited for ball valves. However, needle valves are a preferable choice when the application requires highly accurate flow control by altering the plunger position.

What is the most common valve used in piping systems to throttle or regulate flow?

A gate valve is the most common type of valve in any process plant. It is a linear motion valve used to start or stop fluid flow. In service, these valves are either fully open or fully closed.

How much pressure can a ball valve handle?

Ball valves are extremely versatile as they can handle pressures up to 1000 bars and temperatures up to 400 degrees. Their sizes range from 0.5 cm to 121 cm and they are easy to operate and repair. Ball valves are designed to allow only a 90-degree rotation for opening and closing the valve.

Which of the following is a disadvantage of ball valves?

Disadvantages of ball valves They are not suitable for slurry type applications due to cavities around the ball and seats. Slurries or other thick liquids tend to solidify or clog inside of the cavities, greatly increasing the operating torque of the valve and in some cases rendering the valve inoperable.

Does a ball valve need to be fully open?

Because of minimal flow restrictions, ball valves cause a low-pressure drop compared to other valve types, which prevents valve damage. Since ball valves only require a one-quarter turn to fully open or shut off, they offer a great way to immediately allow or restrict fluid flow.

Can I use ball valve to throttle flow?

Ball Valves are also designed to be operated fully open or fully closed with any liquid containing particles that could scratch the ball. Many people use them successfully for throttling clear water. Ball valves have low pressure drops, open and close quickly, are simple, and are trouble free.

Can you partially open a ball valve?

Furthermore, a ball valve can be partially open to regulate the flow of gas/liquid. An advantage to the ball valve is that it's relatively easy to tell when it is open or closed.

Can a globe valve be used for throttling?

Globe valves are used for applications where throttling or repeated operation is required. They can provide fine control of flow and are the most common type of valve to use for modulating flow. The three basic globe valve body designs are Wye, Tee and Angle.

What is the difference between ball valve and butterfly valve?

Flow regulation: Both valve types can be used for on/off control and proportional control, but ball valves are typically used for proportional due to better flow regulation. Ports: A butterfly valve can only have two ports, while a ball valve can have more than two ports.

What is butterfly valve not suitable for?

Butterfly valve: working principle Butterfly valves generally provide bi-directional flow and shutoff capability. However, they are not full-bore, which renders them unsuitable for pigging or swabbing. The body material is ductile iron with an epoxy powder coat on both internal and external surfaces.