Why are gate valves so widely used?

This post was last edited by ylb913 on 2015-10-5 at 16:16. Butterfly valves have relatively poor sealing performance, and ball valves are very expensive. I once asked others why, when searching for valves on Baidu, all the results are related to ball valves It’s because ball valves are profitable.

Agree with the opinion from floor 3! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

Gate valves have good sealing performance and low fluid resistance; they are suitable for media containing particulate solids and those with high viscosity. The downside is that their sealing surfaces wear out easily and are difficult to repair. But butterfly valves are lighter in weight and smaller in size compared to parallel gate valves of the same pressure rating; they are suitable for oil and water media at pressures up to 1.0 MPa and temperatures below 80 degrees. Their drawback is poor sealing performance. A ball valve is as mentioned above: under the same process conditions and materials, ball valves have a higher price.

Light weight: The body is made of high-grade ductile iron, resulting in a weight that is about 20%~30% lower than that of traditional gate valves, making installation and maintenance easier. Flat-bottomed seat: Traditional gate valves often suffer from leaks due to the accumulation of foreign objects such as stones, wood pieces, cement, iron shavings, and other debris in the grooves at the bottom of the valve after water is used for cleaning. This accumulation makes it difficult for the valve to close tightly. Gate valves with elastic seat seals feature a flat-bottom design similar to that of plumbing fixtures, which prevents the buildup of debris and ensures smooth flow of fluids. Full rubber coating: The gate plates are covered with high-quality rubber on both the inner and outer sides. Europe’s top-tier rubber vulcanization technology ensures that the vulcanized gate plates maintain precise geometric dimensions; moreover, the rubber bonds firmly to the ductile iron gate plates, preventing it from coming loose while also ensuring good elastic memory. Precision-cast valve body: The valve body is manufactured through precision casting, and its precise geometric dimensions ensure that the valve remains sealed without the need for any further machining. Advantages: 1. Low flow resistance. The medium flow channel inside the valve body is straight, allowing the medium to flow in a linear path with low flow resistance. 2. It requires less effort to open and close. Compared to globe valves, this is because whether it is open or closed, the movement direction of the gate is perpendicular to the flow direction of the medium. 3. Large height and long opening/closing time. The opening and closing stroke of the gate plate is large, and the lowering is accomplished via a screw. 4. Water hammer phenomenon is unlikely to occur. The reason is the long shutdown time. 5. The medium can flow in either direction, making installation easy. The channels on both sides of the gate valve are symmetrical. 6. The structural length (the distance between the two connecting end faces of the housing) is relatively small. 7. It has a simple shape, a short structural length, good manufacturability, and a wide range of applications. 8. It features a compact structure, high stiffness of the valves, smooth flow channels, and low flow resistance. The sealing surfaces are made of stainless steel and cemented carbide, ensuring a long service life. PTFE packing is used for reliable sealing, along with easy and flexible operation

Globe valves are relatively inexpensive and are typically used for on/off applications; they cannot regulate flow.