When a direct flow of fluid with minimal restriction is required, manual valves are used. By closing or opening the gate, these devices assist in allowing or stopping flow through the valve. Our manual valves have a variety of characteristics, including resistance to large volume flow and extreme pressure/temperature, high flow capacity, chemical resistance, durability, and longer service life.
The types of manual valves used in various industries are listed below:
Different Types of Manual Valves
Ball valves: work well as shut-off valves. The valve is fully opened or closed with a quarter-turn (90°). This feature reduces valve operation time and reduces the risk of leakage caused by gland seal wear.
Reduced bore and full bore manual ball valves are the two types available. Reduced bore valves have a valve opening that is smaller than the piping diameter; full bore valves have a valve opening that is the same size as the piping diameter. Because they reduce pressure drop across the valve, full bore ball valves are popular.
Globe Valves: The globe valve has a number of applications, including flow rate control and open/close operation.
With this sort of valve, the flow rate is controlled by the lift of the valve stopper rather than the size of the hole in the valve seat. Even when used partially open, these valves have the advantage of inflicting less damage to the valve seat or valve plug by the fluid than other types of manual valves. Among the several designs available, needle type globe valves are particularly well suited for flow rate control.
Check Valves: Check valves come in a variety of shapes and sizes, and their placement must be carefully considered. Because turbulence from the pump might cause the valve disc to flutter and damage the bearings, the check valve for pumps should be four or five pipe diameters away from the pump. Vertical lines should not have check valves fitted.
Gate Valves: A gate valve, like a floodgate, regulates flow by raising or lowering the valving element, which is available in three different types: solid (plain), flexible, and split. The latter two types help to prevent valving element and body deformation due to a variety of operating situations.
Like the ball valve, this type of manual valve is rarely used to control flow. One of the reasons for this is that the valving element may be damaged if the valve is half-open. They also reduce pressure loss across the valve when fully open.
Butterfly Valves: The flow is controlled by a disc-like device that is held in place in the valve's centre by a rod in butterfly valves. Because the valving element is twisted a quarter turn (90°) to open or close the passageway, the valve operation time is equivalent to that of ball valves.
Butterfly valves are characterised by their simple design, light weight, and compact size. Butterfly valves have a lower pressure drop than globe valves due to their smaller face-to-face dimensions. The materials used for the valving element and sealing can limit its use at higher temperatures or with specific types of fluids. Butterfly valves are commonly used in water and air applications, as well as in large pipe applications.
For more information visit Jay Steel Corporation, a leading Manual Valves Supplier in Mumbai, India
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