Different Definitions:
A globe valve, also known as a gate valve, is a forced-seal valve. Therefore, when the valve is closed, pressure must be applied to the disc to prevent leakage.
A ball valve is a valve in which the opening and closing member (the ball) is driven by the valve stem and rotates around the valve axis.
Different Operating Principles:
1. When the medium in a globe valve enters the valve from below the disc, the operating force must overcome the friction between the stem and packing and the thrust generated by the medium's pressure. The force required to close the valve is greater than the force required to open it, so the stem diameter must be large to prevent stem bending.
2. Ball valves can be used for regulating and controlling fluids. The hard-sealed V-shaped ball valve, with its strong shear force between the V-shaped ball and the carbide-clad metal seat, is particularly suitable for media containing fibers and fine solid particles. Multi-way ball valves, on the other hand, not only flexibly control the merging, diversion, and direction of flow in pipelines, but also can close any channel and connect the other two. This type of valve should generally be installed horizontally in pipelines.
Differences in Application:
1. Globe valves, as one of the most important shut-off valves, play a crucial role in the aerospace industry. As a critical component of aerospace equipment, globe valves perform functions such as media transfer, shutoff, and regulation. Their sealing performance directly impacts the safe and reliable operation of aerospace equipment.
2. Ball valves are widely used in industries such as oil refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, power generation, municipal engineering, and steel.
Other Differences:
Globe valves:
1. Double sealing design (bellows + packing) prevents bellows failure;
2. External leakage is eliminated, and the valve stem packing also meets international sealing standards;
3. No fluid loss, reducing energy loss and improving plant equipment safety;
4. Long service life, reduced maintenance, and lower operating costs;
5. The durable bellows seal design ensures zero valve stem leakage, providing maintenance-free operation.
6. Bellows-sealed globe valves utilize a bellows-sealed design, completely eliminating the drawbacks of conventional valve stem packing seals, which often age quickly and leak easily. This not only improves energy efficiency and increases production equipment safety, but also reduces maintenance costs and frequent repairs, while providing a clean and safe working environment.
Ball Valve
1. Low fluid resistance, with a resistance coefficient equivalent to that of a pipe section of the same length.
2. Simple structure, compact size, and light weight.
3. Tight and reliable. Ball valves are widely used in vacuum systems, with plastic as the sealing surface material, resulting in excellent sealing.
4. Easy to operate, with quick opening and closing. A simple 90° rotation from fully open to fully closed facilitates remote control.
5. Easy maintenance. Ball valves have a simple structure, and the sealing ring is generally removable, making removal and replacement relatively easy.
6. Widely applicable, with diameters ranging from a few millimeters to several meters, and suitable for both high vacuum and high pressure applications.