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Ball valves and gate valves both belong to the same family: shut-off valves. When inside a hydraulic system, these mechanical devices interrupt or regulate the flow, depending on whether the valves are fully open or closed, or if they are used in intermediate positions.
It is important to specify that ball valves, given their fast opening and closing mechanism, are not used to regulate the flow but only to stop or interrupt it.
Gate valves, instead, can be partially open during use, even if it should be remembered that in this case the liquid can become disturbed and friction losses can occur.
Gate valves are used to isolate specific areas of the water supply network: during maintenance, in order to do maintenance, with new installations, or for deviating the flow through the conduit. A completely free passage and minimum pressure drop are the strong points of gate valves. If used in an intermediate position, these valves choke the flow in the conduits.
Gate valves get their name from the shape of their closing disc, which can be straight, like a guillotine, or inclined (wedge). The first solution is preferable above all for high delivery capacities, but in both cases it is always the closing disc that determines valve closing or opening according to whether it is raised or lowered. The valve is opened and closed by the rotary movement of a threaded stem connected to the closing disc. To move from closed to open and vice versa, the handwheel needs to be turned a few times. It is therefore a slow operation, which has the advantage of avoiding dangerous hydraulic shocks.
Commonly used in civil and industrial applications, ball valves get their name from their round closing disc; the disc has a bore that is coaxial to the flow. When the valve is open, the hollow ball becomes a part of the conduit and allows the fluid to flow; when it is closed, the flow is completely blocked. To open or close a ball valve, just give it a quarter turn, making the ball rotate along the same axis as the fluid flow, and as such the piping. Even though this quick movement can be made manually (think about taps in a home), it can just as easily be automated, for example using a pneumatic actuator, in the case of industrial systems.
(read also Motorised valves with pre-assembled pneumatica actuator: the advantages of a perfect combination)
As anticipated, the quick movement can cause hydraulic shock; the wave generated by the movement of the fluid when stopped quickly can damage the piping, a problem that is solvable by installing check valves along the piping.
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(read also How to prevent water hammer consequences and avoid damages)
In conclusion, here is an outline of the strong points, and differences between, these two types of valve:
A gate valve is a device used to stop and start the flow of liquid and isolate sections of a water supply as required. Sometimes referred to as a sluice valve, there are many different types of gate valves suitable for various applications in utility distribution, industrial and HVAC pipeline settings. Let&#;s take a look at what a gate valve is used for, the differences between the most common types, and the things to consider when specifying a gate valve.
A gate valve is a type of linear valve used to isolate areas of a water supply. As the name suggests, it acts like a gate that shuts off the flow and opens it again when needed.
Gate valves work via a gate or wedge that lifts (opens) or lowers (closes) into the path of the flowing liquid. Motion is produced by an actuator that is connected to the stem of the gate, which may be manual, electrically, pneumatically or hydraulically powered. They may have a rising stem, meaning it is fixed to the gate, or a non-rising stem, where it is fixed to the actuator and remains within the valve body. The latter is most commonly used in the waterworks industry and is suitable for underground applications where there is limited vertical space.
Gate valves may also sometimes be referred to as stop valves, line valves, wedge gate valves and sluice valves, but they are not to be confused with sluice gates or penstocks. These are altogether larger devices used to severe the flow of sewage and water in treatment plants and drainage systems, etc.
A gate valve is commonly used for isolation duties within potable water, wastewater, sewage and fire main applications. They may be used during maintenance tasks and repair works, as well as being deployed in new installations.
There are many different types of gate valves to suit different applications. Some of the most common designs include wedge gate valves, parallel gate valves, knife gate valves, and rising/non-rising stem gate valves. Generally speaking, you can classify gate valves in three different ways:
The best type to deploy will very much depend on what the gate valve is used for. For example, metal seat valves use a non-ferrous metal face, making them ideally suited to wastewater and sewage applications. When isolating water and clean neutral fluids, resilient seated gate valves provide the ideal solution and work using a rubber encapsulated wedge. Meanwhile, knife gate valves are ideal for handling dense fluids and dry bulk solids. Most gate valves deployed in the waterworks industry have non-rising stems, also referred to as inside screw, meaning the stem remains within the body of the valve.
T-T Flow offers a wide variety of gate valves designed to British and European Standard, with many different options to suit differing applications.
For more information or to discuss your requirements, speak to our expert team on +44 (0) .
Ball valves and gate valves both belong to the same family: shut-off valves. When inside a hydraulic system, these mechanical devices interrupt or regulate the flow, depending on whether the valves are fully open or closed, or if they are used in intermediate positions.
It is important to specify that ball valves, given their fast opening and closing mechanism, are not used to regulate the flow but only to stop or interrupt it.
Gate valves, instead, can be partially open during use, even if it should be remembered that in this case the liquid can become disturbed and friction losses can occur.
Gate valves are used to isolate specific areas of the water supply network: during maintenance, in order to do maintenance, with new installations, or for deviating the flow through the conduit. A completely free passage and minimum pressure drop are the strong points of gate valves. If used in an intermediate position, these valves choke the flow in the conduits.
Gate valves get their name from the shape of their closing disc, which can be straight, like a guillotine, or inclined (wedge). The first solution is preferable above all for high delivery capacities, but in both cases it is always the closing disc that determines valve closing or opening according to whether it is raised or lowered. The valve is opened and closed by the rotary movement of a threaded stem connected to the closing disc. To move from closed to open and vice versa, the handwheel needs to be turned a few times. It is therefore a slow operation, which has the advantage of avoiding dangerous hydraulic shocks.
Commonly used in civil and industrial applications, ball valves get their name from their round closing disc; the disc has a bore that is coaxial to the flow. When the valve is open, the hollow ball becomes a part of the conduit and allows the fluid to flow; when it is closed, the flow is completely blocked. To open or close a ball valve, just give it a quarter turn, making the ball rotate along the same axis as the fluid flow, and as such the piping. Even though this quick movement can be made manually (think about taps in a home), it can just as easily be automated, for example using a pneumatic actuator, in the case of industrial systems.
(read also Motorised valves with pre-assembled pneumatica actuator: the advantages of a perfect combination)
As anticipated, the quick movement can cause hydraulic shock; the wave generated by the movement of the fluid when stopped quickly can damage the piping, a problem that is solvable by installing check valves along the piping.
(read also How to prevent water hammer consequences and avoid damages)
In conclusion, here is an outline of the strong points, and differences between, these two types of valve:
A gate valve is a device used to stop and start the flow of liquid and isolate sections of a water supply as required. Sometimes referred to as a sluice valve, there are many different types of gate valves suitable for various applications in utility distribution, industrial and HVAC pipeline settings. Let&#;s take a look at what a gate valve is used for, the differences between the most common types, and the things to consider when specifying a gate valve.
A gate valve is a type of linear valve used to isolate areas of a water supply. As the name suggests, it acts like a gate that shuts off the flow and opens it again when needed.
Gate valves work via a gate or wedge that lifts (opens) or lowers (closes) into the path of the flowing liquid. Motion is produced by an actuator that is connected to the stem of the gate, which may be manual, electrically, pneumatically or hydraulically powered. They may have a rising stem, meaning it is fixed to the gate, or a non-rising stem, where it is fixed to the actuator and remains within the valve body. The latter is most commonly used in the waterworks industry and is suitable for underground applications where there is limited vertical space.
Gate valves may also sometimes be referred to as stop valves, line valves, wedge gate valves and sluice valves, but they are not to be confused with sluice gates or penstocks. These are altogether larger devices used to severe the flow of sewage and water in treatment plants and drainage systems, etc.
A gate valve is commonly used for isolation duties within potable water, wastewater, sewage and fire main applications. They may be used during maintenance tasks and repair works, as well as being deployed in new installations.
There are many different types of gate valves to suit different applications. Some of the most common designs include wedge gate valves, parallel gate valves, knife gate valves, and rising/non-rising stem gate valves. Generally speaking, you can classify gate valves in three different ways:
The best type to deploy will very much depend on what the gate valve is used for. For example, metal seat valves use a non-ferrous metal face, making them ideally suited to wastewater and sewage applications. When isolating water and clean neutral fluids, resilient seated gate valves provide the ideal solution and work using a rubber encapsulated wedge. Meanwhile, knife gate valves are ideal for handling dense fluids and dry bulk solids. Most gate valves deployed in the waterworks industry have non-rising stems, also referred to as inside screw, meaning the stem remains within the body of the valve.
T-T Flow offers a wide variety of gate valves designed to British and European Standard, with many different options to suit differing applications.
For more information or to discuss your requirements, speak to our expert team on +44 (0) .