What principles should you follow when choosing a Pipeline Valve
2024-12-10
The final control of the pipeline is the valve, the valve opening and closing parts control the flow mode of the medium in the pipeline, the shape of the valve flow path makes the valve have a certain flow characteristics, which must be taken into account when choosing the most suitable valve for installation in the pipeline system.
The following principles should be followed when choosing a Pipeline Valve:
(1) Valves for closing and opening media
The flow channel is a straight-through valve, whose flow resistance is small, and the valve is usually selected as a cut-off and opening medium. Downward closed valves (globe valves, plunger valves) are less used because of their tortuous flow channels and higher flow resistance than other valves. In cases where high flow resistance is allowed, closed valves can be selected.
(2) Valves for controlling flow
Usually choose a valve that is easy to adjust the flow rate as a control flow. Downward closing valves, such as globe valves, are suitable for this purpose because their seat size is proportional to the stroke of the closing member. Rotary valves (plug valves, butterfly valves, ball valves) and flex-body valves (clamp valves, diaphragm valves) can also be used for throttling control, but usually only in a limited range of valve calibers. Gate valve is a disc-shaped gate to the circular seat mouth to do cross-cutting movement, it can only be close to the closed position, in order to better control the flow, so it is usually not used for flow control.
(3) Valve for reversing shunt
The valve may have three or more channels, depending on the need for reversing shunt. Plug and ball valves are more suitable for this purpose, so most valves used for reversing shunt use one of these valves. However, in some cases, other types of valves, as long as two or more valves are properly connected to each other, can also be used for reversing shunt.
(4) Valves for medium with suspended particles
When there are suspended particles in the medium, it is best to use the sliding valve with wiping action along the sealing surface. If the closure is vertical in its back and forth motion against the seat, it may trap particles, so the valve is only suitable for a basically clean medium unless the sealing surface material allows embedding of particles. Ball valves and plug valves have a wiping effect on the sealing surface during opening and closing, so they are suitable for use in media with suspended particles.
The following principles should be followed when choosing a Pipeline Valve:
(1) Valves for closing and opening media
The flow channel is a straight-through valve, whose flow resistance is small, and the valve is usually selected as a cut-off and opening medium. Downward closed valves (globe valves, plunger valves) are less used because of their tortuous flow channels and higher flow resistance than other valves. In cases where high flow resistance is allowed, closed valves can be selected.
(2) Valves for controlling flow
Usually choose a valve that is easy to adjust the flow rate as a control flow. Downward closing valves, such as globe valves, are suitable for this purpose because their seat size is proportional to the stroke of the closing member. Rotary valves (plug valves, butterfly valves, ball valves) and flex-body valves (clamp valves, diaphragm valves) can also be used for throttling control, but usually only in a limited range of valve calibers. Gate valve is a disc-shaped gate to the circular seat mouth to do cross-cutting movement, it can only be close to the closed position, in order to better control the flow, so it is usually not used for flow control.
(3) Valve for reversing shunt
The valve may have three or more channels, depending on the need for reversing shunt. Plug and ball valves are more suitable for this purpose, so most valves used for reversing shunt use one of these valves. However, in some cases, other types of valves, as long as two or more valves are properly connected to each other, can also be used for reversing shunt.
(4) Valves for medium with suspended particles
When there are suspended particles in the medium, it is best to use the sliding valve with wiping action along the sealing surface. If the closure is vertical in its back and forth motion against the seat, it may trap particles, so the valve is only suitable for a basically clean medium unless the sealing surface material allows embedding of particles. Ball valves and plug valves have a wiping effect on the sealing surface during opening and closing, so they are suitable for use in media with suspended particles.