Gate valves may not be used as often as they were in the past since ball valves started becoming more and more popular, but for certain applications, gate valves are perfect for the job. Irrigation applications still use gate valves as there are still strong benefits that gate valves can offer that Industry.
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In this post, we will take a look at the difference between gate valves and knife valves and explore why gate valves are still popular in certain applications. Let's get started.
Gate valves and knife valves are linear motion valves, which include a flat closure element called a gate. The gate inside the valve slides up and down by turning a hand wheel counter clockwise to open and clockwise to close. For knife valves, you simply slide the gate by pushing or pulling the handle. Both valves move the gate into the flow stream to stop the flow of fluid completely. To explore what the markings found on gate and ball valves mean, check out our blog post, How to Understand Ball Valve Markings.
Gate and Knife valves are designed to minimize pressure drop across the valve. In the fully opened position, the diameter of the opening that the liquid passes through is equal to that of the pipe and the direction of flow is not changed.
Gate valves can be found anywhere an economical shut off is required. Gate valves are ideal for any application that involves slurries as the gate can cut right through. Gate valves are also common in applications using liquids like heavy oils, light grease, varnish and other non-flammable liquids.
Gate valves are perfect for irrigation systems where high flow rates are required. Gate valves are slow closing as it takes several revolutions to open or close the gate, therefore flow is started and stopped slower than ball valves. Gate valves are extremely common in Irrigation applications because the speed of closing is not as essential as strength to support a high flow rate.
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Most gate valves have metal to metal seats which doesn't create a positive seal and can sometimes cause leaks, whereas ball valves shut tight. Gate valves also have a tendency to seize up if not used over a certain period of time, leading to leaks at the stem packing.
As seen in the picture above, gate valves tend to be bulkier compared to ball valves. They stick out more, which is not ideal for tight spaces. For some applications, ball valves would be the better choice as they can offer a leak free seal. For more information on ball valves, check out our post, What the Heck is a Ball Valve?
Gate valves can be used wherever throttling capabilities are desired however, this is not typically recommended as erosion of the seat and disc occur due to the vibrations of the disc resulting in the valve leaking over time.
Although gate valves might not be the most favoured valve on the market, they are still a suitable option for certain functions. Be aware of location and the situation for which you require a valve to determine which style of valve will work the best for you.
Head over to Boshart's Knowledge Base: technical product information, guidelines, and more.
Gate valves may not be used as often as they were in the past since ball valves started becoming more and more popular, but for certain applications, gate valves are perfect for the job. Irrigation applications still use gate valves as there are still strong benefits that gate valves can offer that Industry.
In this post, we will take a look at the difference between gate valves and knife valves and explore why gate valves are still popular in certain applications. Let's get started.
Gate valves and knife valves are linear motion valves, which include a flat closure element called a gate. The gate inside the valve slides up and down by turning a hand wheel counter clockwise to open and clockwise to close. For knife valves, you simply slide the gate by pushing or pulling the handle. Both valves move the gate into the flow stream to stop the flow of fluid completely. To explore what the markings found on gate and ball valves mean, check out our blog post, How to Understand Ball Valve Markings.
Gate and Knife valves are designed to minimize pressure drop across the valve. In the fully opened position, the diameter of the opening that the liquid passes through is equal to that of the pipe and the direction of flow is not changed.
Gate valves can be found anywhere an economical shut off is required. Gate valves are ideal for any application that involves slurries as the gate can cut right through. Gate valves are also common in applications using liquids like heavy oils, light grease, varnish and other non-flammable liquids.
Gate valves are perfect for irrigation systems where high flow rates are required. Gate valves are slow closing as it takes several revolutions to open or close the gate, therefore flow is started and stopped slower than ball valves. Gate valves are extremely common in Irrigation applications because the speed of closing is not as essential as strength to support a high flow rate.
Most gate valves have metal to metal seats which doesn't create a positive seal and can sometimes cause leaks, whereas ball valves shut tight. Gate valves also have a tendency to seize up if not used over a certain period of time, leading to leaks at the stem packing.
As seen in the picture above, gate valves tend to be bulkier compared to ball valves. They stick out more, which is not ideal for tight spaces. For some applications, ball valves would be the better choice as they can offer a leak free seal. For more information on ball valves, check out our post, What the Heck is a Ball Valve?
Gate valves can be used wherever throttling capabilities are desired however, this is not typically recommended as erosion of the seat and disc occur due to the vibrations of the disc resulting in the valve leaking over time.
Although gate valves might not be the most favoured valve on the market, they are still a suitable option for certain functions. Be aware of location and the situation for which you require a valve to determine which style of valve will work the best for you.
Head over to Boshart's Knowledge Base: technical product information, guidelines, and more.
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