What do throttling valves do?
Throttling valves are valves that allow you to adjust the amount of flow by being able to adjust the size of the flow path through the valve. The two main types of valves that we offer for throttling applications are our globe valves and our needle valves.
What is throttling in flow?
[′thräd·əld ′flō] (fluid mechanics) Flow which is forced to pass through a restricted area, where the velocity must increase.
What is throttling process in valves?
Throttling is a process where a high-pressure fluid is converted into low-pressure by using a throttle valve. In a throttling process, the enthalpy remains constant and the work done is zero.
What type of valve is used for 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. For throttling to happen, it only needs to open a bit for the media to pass.
Can you use a butterfly valve for throttling?
Butterfly valves, like ball valves, operarte with a 1/4 turn. They are generally used for handling large flows of gases or liquids, including slurries, but should not be used for throttling for extended periods of time.
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.
How does entropy increase throttling?
Because of the viscous heat generation in the throttling operation, the temperature change is small, and so the decrease in pressure (increase in volume) will result in an increase in entropy.
What remains constant during throttling?
4.2. Some properties of throttling processes are: In an ideal gas, enthalpy is a function of temperature only, and temperature remains constant. Temperature decreases for most real gases.
Is a valve a throttling device?
How Throttling Devices Work? The throttling devise can be the valve or the copper tubing that allows the flow of the refrigerant through very small opening also called as the orifice. The throttling devices allow restricted flow of the refrigerant.
What is constant during throttling process?
A throttling process is a thermodynamic process, in which the enthalpy of the gas or medium remains constant (h = const). During the throttling process no work is done by or on the system (dW = 0), and usually there is no heat tranfer (adiabatic) from or into the system (dQ = 0).
What is an advantage of a butterfly valve?
Advantages of a Butterfly Valve The disc is lighter than a ball, and the valve requires less structural support than a ball valve of comparable diameter. Butterfly valves are very precise, which makes them advantageous in industrial applications. They are quite reliable and require very little maintenance.