Knife and gate valves are primarily used for on and off service in industries. They are suitable to open and close slowly to protect the device from the effects of a water hammer. Since these shut-off valves are used in applications involving heavy oil, slurries, wastewater, non-flammable viscous fluids, and clean water, people tend to confuse one for the other.
If you want to learn more, please visit our website.
None is suitable for regulating the flow because vibrations occur when fluid pushes against a partially closed gate. It may wear and erode the seat and disk eventually. Due to such a reason, valves bought from a valve manufacturer in China should be either completely open or closed.
Although the applications of a knife and a gate valve are mostly the same, many design features set them apart. It is essential to learn about these variances to be able to pick the right one for a process application. So, let&#;s put the two head-to-head to know everything about knife valve vs. gate valve!
A knife gate valve was initially designed for the pulp and paper industry. When stringy pulp impinges between the wedge and the sand seat to prevent flow shut-off, a knife valve is used to deal with it. It features a sharp edge to cut through the pulp and seal to deal with viscous fluids with a similar impingement risk.
This valve type is typically employed in heavy oil, wastewater, paper and pulp, and sludge and slurry industries. These devices are generally specified in larger sizes to handle viscous flows in several demanding applications.
Despite these advantages, a knife valve may sometimes cause significant inconvenience to the users.
The function of a knife valve diminishes when used in dry bulk applications. Its blade fits into an elastomer seal after it cuts through the media. Over time, the seal becomes abraded and may influence the sealing performance, leading to downtime, decreased production, and negatively impacting revenue streams.
As opposed to flowing regulation operations, a gate valve is often used for shut-off operations as it offers only on and off settings to a user.
A butterfly gate valve operates by lifting a round or a rectangle-shaped gate from the path of the media, typically fluids. The sealing surface lying between the gate and the seats is called planar. It is often suitable for applications requiring a straight flow of fluids with minimal restrictions. It has a flat closure that slides in or out, up or down between the two parallel plates to open or close.
It is widely used in oil and gas, pharmaceuticals, automotive, power plants, mining, offshore, general process manufacturing, and water treatment.
Although a valve bought from gate valve manufacturers is a valuable device in industries, it has some downsides too.
Here is a table to learn about knife valve vs. gate valve available at a reliable industrial valves company:
BASIS OF DIFFERENCEKNIFE VALVEGATE VALVEDESIGNA knife valve features a sharpened disk to sever any stringent solids that may keep it from closing and causing leaks.A gate valve features a flat closure sliding in and out, up and down between parallel plates to open and close it.PACKING GLANDA knife valve has a packing gland to seal around the gate.A gate valve has a v-ring packing set to seal the shaft attached to the gate.DIMENSIONSA knife valve is available in either wafer or lugged body with no flangs.A gate valve is wider, flanged, ANSI pressure-rated, and has API leak tightness.PROFILEIt has a thin profile.It has a bulky profile.STANDARDSIt is built to TAPPI standards.It is built to ANSI standards.DIRECTIONKnife valves are uni-directional.Gate valves are bi-directional.WEIGHTA knife valve weighs far less than a gate valve.A gate valve weighs a lot more than a knife valve.COSTIt is a cost-friendly option compared to its counterpart.It is an expensive option compared to its counterpart.TYPICAL APPLICATIONIt is widely used in sludge and slurry, paper and pulp, wastewater management, and heavy oil industries.It is widely used in oil and gas, automotive, power plants, mining, process manufacturing, offshore, water treatment, and pharmaceuticals.AVAILABILITYIts seat comes in metal to resilient types.It is only available with metal seats.In brief, a knife valve employs a blade to cut through thick fluids, while a gate valve uses a slide plate to shut off the flow of dry bulk material. The sharp and beveled edge of a knife valve makes it ideal for large-sized applications involving varnish, paper pulp, light grease, and wastewater. Its easy actuation and low cost make it perfect for several industries.
A China actuated gate valve is perfect for handling dry bulk powders, pellets, and granules. It has a flat, rectangular slide plate to shut off or permit dry material flow. It actuates between two compressed-loaded, rigid polymer plates reinforced by a compressed, hard rubber.
When the gate experiences frictional wear to the rugged polymer seals from several actuators over time, its rubber backing ensures the seal constantly forces against the slide plate. But sometimes, the hard polymer seals may wear and lose their effectiveness. When it happens, the bolts may loosen, and remove shim along each lateral aspect of the gate to re-tighten the bolts. It will help restore the compression load of the gate.
Yaxing Valve contains other products and information you need, so please check it out.
Hopefully, this article helps everyone learn about knife valve vs. gate valve to pick a suitable option according to the application.
When quoting the ideal valve for a facility, it is vital to consult a reliable manufacturer who offers these valves at an affordable price. Depending on the media flowing through the device, valve quality, and application, a user must select the correct valve. It will help save replacement costs for the future. To buy these valves in high-quality and at an affordable range, please contact us.
In this article, you can read about the difference between knife gate valves and gate valves. Both the wedge-type gate valves and the knife gate valves are primarily designed for on-off services where the valve is completely opened or completely closed. It is not recommended to use either of these to regulate flow because when fluid pushes against a partially closed gate, vibration occurs, and cavitation will eventually damage the seat and the body. Also, both valve types are designed to open and close slowly to reduce the risk of water hammer.
Gate and knife gate valves are primarily for on/off service. Using these types of valves to regulate flow is not recommended because when fluid pushes against a partially closed gate vibration occurs, eventually wearing and eroding the seat and disk. For that reason, these types of valves should be either completely opened or completely closed.
These valves are also designed to open and close slowly to protect from the effects of water hammer.
One of the differences between the gate and the knife gate valves is that the knife gate valve often has a sharpened disc to better cut through slurry/viscous media. Also, the knife gate valve has a short face-to-face length compared to a gate valve, which is dimensionally wider. As a consequence, a knife gate valve is lightweight compared to a gate valve. These are the main differences and probably two of the biggest advantages of the knife gate valve.
Knife gate valves are typically found in wastewater treatment plants, chemical plants, mining, and cement plants as well as in many other industrial applications while gate valves are typically found in drinking water mains, distribution networks, and drinking water pump stations.
The differences between them are vast. First off, yes, the knife gate valve DOES have a sharpened disk (thank you very much). This is meant to sever any stringent solids that may keep the valve from closing and causing it to leak. But there&#;s more that makes their designs quite different.
That gate valves are built to ANSI standards while knife gate valves adhere to TAPPI standards. Therefore, dimensionally the gate valve is wider, flanged, and ANSI pressure-rated. It also has API leak tightness standards that must be met. They&#;re bi-directional, and commonly used in steam applications as well as fluid applications. The gate valve is only available with metal seats.
Another significant difference between an ANSI gate valve and a knife gate valve is in the packing gland area. A gate valve will have a v-ring packing set that seals the shaft attached to the gate, while a knife gate valve has a packing gland that seals around the gate.
A knife gate has a very thin profile compared to its bulkier counterpart. It&#;s also uni-directional (though bi-directional is an option on some), and comes in either a wafer or lugged body, with no flanges. The seats on the knife gate valve come in everything from metal to resilient types.
Two of the knife gate&#;s biggest advantages knife are weight and expense. A 16&#; knife gate valve will typically weigh less than 300# while an ANSI gate valve will be in excess of #. The cost of the valve is similar to the weight difference as well.
A knife gate valve was initially designed for the pulp and paper industry. When stringy pulp impinges between the wedge and the sand seat to prevent flow shut-off, a knife valve is used to deal with it. It features a sharp edge to cut through the pulp and seal to deal with viscous fluids with a similar impingement risk.
This valve type is typically employed in heavy oil, wastewater, paper and pulp, and sludge and slurry industries. These devices are generally specified in larger sizes to handle viscous flows in several demanding applications.
The company is the world’s best Socket Resilient Seated Gate Valve supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.