Applications And Comparison Of 3-way Flanged Ball Valve, Electric Globe Valve, And Electric Gate Valve

3 Way Flanged Ball Valve Applications and Comparison of Electric Globe Valves and Electric Gate Valves:

1.3 Way Flanged Ball Valve

3 Way Flanged Ball Valve evolved from the plug valve. They share the same 90-degree rotational action, but differ in that the plug body is spherical with a circular through-hole or channel centered on its axis. The ratio of the spherical surface to the channel opening is such that when the ball is rotated 90 degrees, the entire spherical surface appears at both the inlet and outlet, thereby shutting off the flow. A ball valve achieves a tight shutoff with only a 90-degree rotation and minimal torque. The perfectly flat inner cavity of the valve body provides a direct, low-resistance flow path for the medium. While ball valves are generally considered best suited for direct opening and closing, recent developments have enabled ball valves to be designed for throttling and flow control. The key features of ball valves are their compact design, ease of operation, and maintenance. They are suitable for general working media such as water, solvents, acids, and natural gas, as well as for media with harsh working conditions such as oxygen, hydrogen peroxide, methane, and ethylene. Ball valve bodies can be either one-piece or modular.

2. Electric Globe Valve

The axis of the valve stem of an electric globe valve is perpendicular to the valve seat sealing surface. The valve stem has a relatively short opening and closing stroke, and provides a very reliable shutoff action, making this valve ideal for shutting off, regulating, and throttling media. Once the globe valve disc is open, there is no contact between the valve seat and disc sealing surfaces, resulting in a very reliable shutoff action, making this valve ideal for shutting off, regulating, and throttling media.

Once the globe valve is open, there is no contact between the valve seat and disc sealing surfaces, resulting in less mechanical wear on the sealing surfaces. Since the valve seat and disc of most globe valves are easily repaired or the sealing element replaced without removing the entire valve from the pipeline, this is ideal for applications where the valve and pipeline are welded together. Because the flow direction of the media changes when passing through this type of valve, the flow resistance of a globe valve is higher than that of other valves.

3. Electric Gate Valve

Electric gate valves are used to shut off media. When fully open, the flow is unimpeded, minimizing pressure loss during the flow of the media. Gate valves are generally suitable for applications where frequent opening and closing are not required and the gate disc must be kept fully open or closed. They are not suitable for regulating or throttling. For high-speed media, a partially open gate disc can cause vibration, which can damage the sealing surfaces between the disc and the valve seat. Throttling can also cause erosion of the disc by the media. Structural differences primarily lie in the type of sealing element used. Gate valves are often classified into several different types based on the type of sealing element.

Manual valves are the most basic type of valve actuation. They can be directly actuated using a handwheel, handle, or wrench, or actuated through a transmission mechanism. When the valve's opening torque is high, a gear or worm gear drive can be used to reduce the torque required. Gear drives are classified into spur gears and bevel gear drives. Gears have a small reduction ratio and are suitable for gate and globe valves, while worm gear drives have a large reduction ratio and are suitable for plug and ball valves.