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Because the valve is widely used, so it plays a great role. For example, in power plants, valves can control the operation of boilers and steam turbines; in petroleum and chemical production, valves also play a role in controlling the normal operation of all production equipment and processes. The same is true in other sectors. Nevertheless, valves are often overlooked in comparison with other products.

The Differences between Soft Sealed and Hard Sealed Ball Valves are in structure,in process,and in service conditions,in sealing material,we will find from following features for each type.

Butterfly valve have been around for a long time, and are used for a variety of applications. They made their first appearance during the 1930s, and have been utilized by several industries ever since. Often made out of cast iron, butterfly valve's name is based from the functionality of its disc.

Butterfly valves are like ball valves however have a few focal points. They are small and when activated pneumatically, they open and close rapidly. The plate is lighter than a ball, and the valve requires less structural backing than a ball valve of equivalent distance across.

The check valves on this steam locomotive are located under the small cover between the chimney and the main dome.Check valves are often used with some types of pumps. Piston-driven and diaphragm pumps such as metering pumps and pumps for chromatography commonly use inlet and outlet ball check valve.

A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a ball. In some ball check valves, the ball is spring-loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal.

The valve flap of the swing check valve is disc-shaped and rotates around the shaft of the valve seat passage. The flow passage is streamlined and the flow resistance is smaller than that of the butterfly check valve. It is suitable for low flow rate and irregular flow.

The swing check valve is also called a check valve or a check valve, and its function is to prevent the medium in the pipeline from flowing backward. The valve of the opening and closing member is opened or closed by the medium activity and force to prevent the back flow of the medium.

A swing check valve or tilting disc check valve is a check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow.