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Gate valves, also known as knife valves or slide valves, are linear motion valves that provide shut-off by sliding a flat closure element into the flow stream. They are one of the most widely used valves. Gate valves are available in a wide range of designs, each of which employs a different technology to meet the needs of different applications. The closure element, which slides into the flow stream to provide shutoff and thus acts as a gate, is the name given to gate valves.
A gate valve controls the flow of media by raising (opening) and lowering (closing) the gate (closed). The straight-through, unobstructed passageway of a gate valve is its distinguishing feature, resulting in minimal pressure loss across the valve. The slow operation also prevents water hammer effects because the valve has to turn multiple times to go from open to closed position.
Because of its simple design and ability to be used in a variety of low-pressure-drop applications, the gate valve is one of the most commonly used valves today. Gate valves are designed to be full-port valves. This means that the valve port is the same size as the inner diameter of the connecting pipe. A full-bore gate valve allows fluid to flow through the pipeline without being obstructed or causing a pressure drop.
Gate valves can be used in extreme conditions, such as high-temperature and high-pressure situations. They’re frequently used in: –
Some valves, such as ball valves, globe valves, and needle valves, are named after their shapes. Other valves are named after their movement and function, such as gate valves, plug valves, pinch valves, life valves, slide valves, and other valves. The movement of a butterfly control valve is also named after it.
Butterfly valves are a type of valve that can control or isolate flow. The closing mechanism is shaped like a disc. The mechanism works similarly to a ball valve, allowing for quick shutoff. Butterfly valves are a type of quarter-turn valve that works in a similar way to a ball valve. The butterfly is made up of a disc attached to a rod. The disc closes when the rod rotates it a quarter turn perpendicular to the flow direction.
Butterfly valves are popular because of their lightweight, small installation footprint, lower costs, quick operation, and availability in very large sizes. These valves can be controlled by a variety of methods, including handles, gears, and automatic actuators.
Benefits of Butterfly valve are: –
Let us discuss the difference between the two Gate valves & Butterfly valves.
When compared to the butterfly valve, gate valves perform better under pressure. Its construction and use can go on indefinitely without causing excessive pressure fluctuations. Gate valves are more durable than butterfly valves in terms of longevity. Even though butterfly valves have a higher pressure tolerance, their design ensures a higher rate of wear. In contrast to the gate valve, the seal on the valve is always exposed to flow velocity, regardless of whether it is open or closed. Parts of the gate valve are visible to flow for very short bursts of time once activated. In terms of size, butterfly valves are smaller and more compact. As a result, they are more versatile in their application than gate valves. Butterfly valves are less expensive than gate valves in terms of cost. Both valves are intended to act as a flow conduit rather than a regulator. Neither is intended to be used regularly. The flow is uncontrolled once they are released.
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