What's the difference between knife gate valve and ordinary gate valve?

The difference between knife gate valve and ordinary gate valve：

Product Description:

Knife gate valves and ordinary gate valves are both types of valves used in pipeline systems. They differ mainly in their opening and closing mechanism, which is more complex than that of other valves. In addition to the medium flow requirements, there are also other factors that determine how suitable a particular valve will be for a particular application.

The main difference between the knife gate valve and an ordinary gate valve is the opening and closing parts of the disc.

Knife gate valves have a wedge-shaped disc with a circular cross-section, which can be rotated around its axis by rotating gears inside it. When the disc is opened, it works like a door that opens vertically; when closed, it works like a door that opens horizontally; when rotating clockwise or counterclockwise at high speed, it can cut off the medium flow.

Ordinary gate valves have a wedge-shaped disc with a rectangular cross-section, which can be rotated by connecting two shafts together through gears in the middle of their respective openings for rotation (rotation).

The knife gate valve is used to cut off the medium and not for regulating the flow of the medium.Ordinary gate valves can be used to regulate the flow of the medium, but cannot be used only for cutting off a medium.

The ordinary gate valve has a wedge-shaped disc with a circular cross-section, so it can also be used for fine adjustment of flow (throttle). Knife gate valves, on the other hand, are used to stop media flow. Knife gate valves have a wedge-shaped structure that fits between two sides of a pipeline. Whereas ordinary gate valves have a round cross-section with a circular opening on both sides and can be used for fine adjustment of flow (throttle).

The knife gate valve does not have the ability to adjust the flow rate and is typically installed in horizontal pipelines; ordinary gates can control the flow rate of mediums and are typically installed in vertical or inclined pipelines.

Knife gate valves are suitable for media containing suspended solids and fiber media; however, ordinary gate valves should be used instead if you need to throttle and cut off such a medium.

A knife gate valve has a smaller opening than an ordinary gate valve. The seat on which the gate rests must have a wedge shape to achieve the opening and closing of the gate. The disc is a flat plate that can be rotated around its axis, which is installed in horizontal pipelines. It is mostly used for flow regulation, and it can also be used to cut off mediums such as gases and fluids when necessary.

Ordinary gates are mostly used for flow regulation and cutting off mediums, but it can be difficult for them to control large quantities of fluid because they cannot fit well into small spaces due to their size (which is why knives were added).

Knife gate valves are usually installed horizontally, with stems in a vertical position while ordinary gate valves can be installed horizontally or vertically depending upon the application.

⑴Knife gate valves are mostly installed in horizontal pipelines, with the stem in a vertical position.

Knife gate valves are mostly used to cut off medium. Knife gate valves are mainly used in horizontal pipelines, with the stem in a vertical position. Ordinary valve gates can be installed horizontally or vertically as well as in inclined positions. The seat on which the gate rests must have a wedge shape to achieve the opening and closing of the gate, but it should not prevent him from falling down when left alone (single-sided). A double-edged seat prevents this from happening by providing support for both sides of the gate at all times (double-sided).

⑵Ordinary gate valves can be installed horizontally, vertically, or inclinedly in pipelines, with the stem being either vertical or inclined.

A knife gate valve is a special type of valve that can be installed horizontally, vertically, or inclinedly in pipelines. It has a stem that can be either vertical or inclined, and it can also be installed horizontally or vertically.

In addition to this flexibility in installing the knife gate valve, there are other advantages of this type of product over ordinary gate valves:

In case you need to close off the flow completely (when you want to stop water completely), you should use a check valve instead of an ordinary gate valve because it will provide better performance when closing off the flow completely.

Different media flow requirements

Knife gate valves are typically used for cutting off the medium. Knife gate valves have a wedge-shaped disc, which makes them ideal for fine adjustment of flow (throttle). The opening and closing parts of an ordinary gate valve are the disc and seat; these two parts can be opened or closed independently. The disc is usually round or rectangular, while the seat is usually square or rectangular. Ordinary gate valves can be installed in horizontal pipelines, with the stem in a vertical position; knife gate valves are mostly installed in horizontal pipelines, with the stem in a vertical position.

Conclusion:

Knife gate valves are mainly used in pipelines with a large diameter and high flow. It is mainly used for sealing or cutting off the media, so it is not suitable for fine adjustment of flow. Ordinary gate valves can be installed horizontally, vertically, or inclinedly in pipelines, with the stem being either vertical or inclined. The knife gate valve has a wedge-shaped disc with a circular cross-section and a seat on which the gate rests must have a wedge shape to achieve the opening and closing of gates.

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