Selection criteria for water control valves
For most engineers the criteria for selecting control valves is confusing. Usually they end up specifying…
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- Control ValvesControl valves are used to control conditions such as flow, pressure, temperature and liquid level by fully or partially opening or closing in response to signals received from controllers. Control valves can also work with the line media and controlled by Pilots. These types of valves are also known as Self Actuated Automatic Control Valves. The Pilots will respond to changes of pressure or flow and will open/close the valve. These valves do not require an external power source, meaning that the fluid pressure is enough to open and close the valve. Self Actuated Automatic control valves include: pressure reducing valves, flow control valves, back-pressure sustaining valves, level control valves, relief valves and solenoid valves, or a combination of these functions. An altitude valve controls the level of a tank. The altitude valve will remain open while the tank is not full and it will close when the tanks reaches its maximum level. The opening and closing of the valve requires no external power source (electric, pneumatic, or man power), it is done automatically, hence the name, automatic control valve. If you would like more information on automatic control valves or want to know which kind of valve best suits…
- Air Release ValvesAir release valves are used to release the air from pockets that are formed in pipelines. Due to the basic nature of fluid phases, air pockets will form at the high points of a fully pressurized pipeline. Air release valves are necessary for pipeline efficiency and to protect against water hammer. Air in the water lines can cause many problems, the main one speeding up the process of corrosion (Causing high costs in the maintenance of the pipeline). A reduction of flow is also created by air that has been trapped at the bends, tees and other fittings in the system. Flow can even stop due to an “air lock” in the water line. This often happens in chemical feed lines at a water plant. If air release valves are not installed, uncontrolled air releases may occur, causing pressure surges in the system, which can increase the chances of hazards from cavitation. Alternatively, if air is left in a water main, it will eventually cause customers’ meters to read improperly, thus charging the customer for air that is going through the meter, and not water. The “universal” type of Air release valves are designed to allow the automatic discharge of…
- Butterfly ValvesButterfly valves are used for isolating or regulating flow. The closing mechanism takes the form of a disk, situated in the valve body itself. Operation is similar to that of a ball valve, which allows for a quick shut off. Butterfly valves, however, are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support for installation is required. The disc is positioned in the center of the body, passing through the disc is a shaft connected to an actuator on the outside of the valve. This actuator could be a Lever, Gearbox, Electric, Pneumatic or Hydraulic actuator. Unlike a ball valve, the disc is always present within the flow, therefore a pressure drop is always induced in the flow, regardless of valve position. There are different kinds of butterfly valves, each adapted for different pressures and different usage. The rubberlined butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating, and is the most commonly used for many low pressure applications. The Double Eccentric butterfly valve, used in slightly higher-pressure and larger pipe systems, features an offset in the way the disc is positioned, which…
- Check ValvesA check valve or one-way valve is a valve that allows fluid (liquid or gas) to flow through it in only one direction. Check valve designs have evolved drastically over the last 20 years, and the aim of designers has revolved around increasing the speed of closure under its own power. In the case where pump control valves failure mode is not enough (Or no failure mode at all), a fast acting check valve can provide the solution. Different designs are available, listed below. If you need more information about check valves or want to know specifically what solutions you require, get in touch through our contact page.
- Gate ValvesThe gate valve, alternatively known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is that the sealing surfaces between the gate and seats are planar. The gate faces can form a wedge shape or they can be parallel. Gate valves are primarily used to permit or prevent the flow of liquids, but typical gate valves shouldn’t be used for regulating flow, unless they are specifically designed for that purpose. For very viscous fluids, or with abrasive particles and properties a specialty valve known as a knife valve is used and which can cut through these particles. On opening the gate valve, the flow path is enlarged in a highly nonlinear manner with respect to percent of opening. This means that flow rate does not change evenly with stem travel. Also, a partially open gate disk tends to vibrate from the fluid flow. Most of the flow change occurs near shutoff with a relatively high fluid velocity causing disk and seat wear and eventual leakage if used to regulate flow. Typical gate valves are designed to be fully opened…
- Ball ValvesA ball valve is a valve with a specifically designed spherical disc, the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle or lever will be inline with the port position letting you examine the valve’s position. The ball valve, along with the butterfly valve, are part of the family of quarter turn valves. Ball valves are durable and usually work to achieve perfect shutoff. They are therefore an excellent choice for shutoff applications (and are often preferred to gate valves for this purpose). They do not offer the fine control that may be necessary in throttling applications but are sometimes used for this purpose. Listed below are the different types of ball valves that we specialize in. If you would like to know more or want to know which one suits your system specifically, get in touch through our contact page.
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- Control ValvesControl valves are used to control conditions such as flow, pressure, temperature and liquid level by fully or partially opening or closing in response to signals received from controllers. Control valves can also work with the line media and controlled by Pilots. These types of valves are also known as Self Actuated Automatic Control Valves. The Pilots will respond to changes of pressure or flow and will open/close the valve. These valves do not require an external power source, meaning that the fluid pressure is enough to open and close the valve. Self Actuated Automatic control valves include: pressure reducing valves, flow control valves, back-pressure sustaining valves, level control valves, relief valves and solenoid valves, or a combination of these functions. An altitude valve controls the level of a tank. The altitude valve will remain open while the tank is not full and it will close when the tanks reaches its maximum level. The opening and closing of the valve requires no external power source (electric, pneumatic, or man power), it is done automatically, hence the name, automatic control valve. If you would like more information on automatic control valves or want to know which kind of valve best suits…
- Air Release ValvesAir release valves are used to release the air from pockets that are formed in pipelines. Due to the basic nature of fluid phases, air pockets will form at the high points of a fully pressurized pipeline. Air release valves are necessary for pipeline efficiency and to protect against water hammer. Air in the water lines can cause many problems, the main one speeding up the process of corrosion (Causing high costs in the maintenance of the pipeline). A reduction of flow is also created by air that has been trapped at the bends, tees and other fittings in the system. Flow can even stop due to an “air lock” in the water line. This often happens in chemical feed lines at a water plant. If air release valves are not installed, uncontrolled air releases may occur, causing pressure surges in the system, which can increase the chances of hazards from cavitation. Alternatively, if air is left in a water main, it will eventually cause customers’ meters to read improperly, thus charging the customer for air that is going through the meter, and not water. The “universal” type of Air release valves are designed to allow the automatic discharge of…
- Butterfly ValvesButterfly valves are used for isolating or regulating flow. The closing mechanism takes the form of a disk, situated in the valve body itself. Operation is similar to that of a ball valve, which allows for a quick shut off. Butterfly valves, however, are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support for installation is required. The disc is positioned in the center of the body, passing through the disc is a shaft connected to an actuator on the outside of the valve. This actuator could be a Lever, Gearbox, Electric, Pneumatic or Hydraulic actuator. Unlike a ball valve, the disc is always present within the flow, therefore a pressure drop is always induced in the flow, regardless of valve position. There are different kinds of butterfly valves, each adapted for different pressures and different usage. The rubberlined butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating, and is the most commonly used for many low pressure applications. The Double Eccentric butterfly valve, used in slightly higher-pressure and larger pipe systems, features an offset in the way the disc is positioned, which…
- Check ValvesA check valve or one-way valve is a valve that allows fluid (liquid or gas) to flow through it in only one direction. Check valve designs have evolved drastically over the last 20 years, and the aim of designers has revolved around increasing the speed of closure under its own power. In the case where pump control valves failure mode is not enough (Or no failure mode at all), a fast acting check valve can provide the solution. Different designs are available, listed below. If you need more information about check valves or want to know specifically what solutions you require, get in touch through our contact page.
- Gate ValvesThe gate valve, alternatively known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is that the sealing surfaces between the gate and seats are planar. The gate faces can form a wedge shape or they can be parallel. Gate valves are primarily used to permit or prevent the flow of liquids, but typical gate valves shouldn’t be used for regulating flow, unless they are specifically designed for that purpose. For very viscous fluids, or with abrasive particles and properties a specialty valve known as a knife valve is used and which can cut through these particles. On opening the gate valve, the flow path is enlarged in a highly nonlinear manner with respect to percent of opening. This means that flow rate does not change evenly with stem travel. Also, a partially open gate disk tends to vibrate from the fluid flow. Most of the flow change occurs near shutoff with a relatively high fluid velocity causing disk and seat wear and eventual leakage if used to regulate flow. Typical gate valves are designed to be fully opened…
- Ball ValvesA ball valve is a valve with a specifically designed spherical disc, the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle or lever will be inline with the port position letting you examine the valve’s position. The ball valve, along with the butterfly valve, are part of the family of quarter turn valves. Ball valves are durable and usually work to achieve perfect shutoff. They are therefore an excellent choice for shutoff applications (and are often preferred to gate valves for this purpose). They do not offer the fine control that may be necessary in throttling applications but are sometimes used for this purpose. Listed below are the different types of ball valves that we specialize in. If you would like to know more or want to know which one suits your system specifically, get in touch through our contact page.
- Pete’s Valves & Hydraulics
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