Everything You Need To Know About These Valves Before knowing the different types of parts of valves, let us make it clear that what are valves? So, basically, valves are the mechanical devices used to control the flow and pressure in a system. These are crucial parts or components of a piping system that includes the flow of liquids, gases, vapors or slurries, etc. Its basic function is to start or stop, increase or decrease the flow and control the direction of flow, relieve a pipe system of a certain pressure, etc. There are different types of valves listed below: 1. Non-slam check valve: Non-slam check valves are clear by its name; these valves close without slamming, which further means that no excess pressure spikes are created. The disc of a non-slam check valve has an internal spring opposing the opening fluid flow pressure. The swing check valve closes abruptly due to gravity that leads to pressure surge resulting in shockwaves, and further, these waves cause severe stress on the piping system. This can only be sorted by installing a non-slam type check valve. This valve donor relies on gravity. As the upstream velocity of the fluids slows, the spring helps the valve start to close the disc. 2. Next coming to GLOBE VALVES- Globe valves refers to such a valve which is used for regulation of flow in a pipeline consisting of a movable plug or disc elements in a stationary ring seat in a spherical body. It got its name from its shape. Globe valves are widely used in plant piping and are suitable for manual as well as automatic operation. It can also be used for regulating the flow or pressure or complete shutoff of flow. Typically automated globe valve uses smooth stems rather than threaded and is opened and closed by an actuator assembly. 3. Moving on to our next type of valve -the Bellow valve is a gate valve that uses a cylindrical metal bellows to seal the valve against stem the last leakage hermetically. This valve has a complex structure and is a type of control valve stem sealing parts of the bellow seal valves. On the other hand, it prevents fluids from leaking to the air and guarantees zero leakage of pipelines. Besides, in metallurgy, different kinds of bellows are used, box bellows- were traditionally used in east Asia, and Pot bellows- were used in ancient Egypt. 4. Further, it comes to our last type of valve that is a swing check valve. A swing check valve consists of a disc that mounts on its and swings on a hinge or shaft. The disc swings and allows forward flow. When the flow gets stopped, the disc comes back to its place to block reverse flow. Generally, swing check valves are installed where personnel is present. A swing check valve, also known as a tilting disc check valve, is a type of check valve in which the disc moves to block the flow. It swings on a hinge, and it either swings onto the seat to stop the reverse flow or off the seat to allow the forward flow of liquid or gas. Read more - knife valve
