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Different types of Ball Valves

7/2/2015 10:46:40 AM | by Anonymous

Ball Valves

Ball valves are devices with spherical closure unit to provide an ON and flow control. It is a form of quarter-turn valves that use perforated hollow and pivoting ball for controlling the flow. Ball valve is excellent in providing reliable closing process even after many cycles and long period of abandonment in use.

This type of valve is ideal for shut off application and not recommended for application that has high pressure drop across the system for a long period of time. Ball valve is designed to establish a convenient procedure in maintaining controlled and required value for high volume, high pressure and high temperature to any flow of fluid and gas.

It executes an open system when the ball hole is directly aligned with the flow and closed when the valve handle is 90 degrees aligned at the center which is perpendicular in position.

This type of valves can be found in numerous types which are used in various industries such as oil, chemical, allied and pharmaceutical.

Ball valves have four (4) general body types: the fully welded, split body, three piece body and top entry, the difference of this body styles is on the assembly and construction of the ball valve but the operation is still the same.

There are different types of ball valve depending on the ball movement. These are Trunnion Mounted Ball Valve, Floating Ball Valve, and Rising Stem Ball Valve.

• Trunnion Ball Valve – it has an additional mechanical anchoring at the bottom and top of the ball. It is ideal for higher and larger pressure valves.
• Floating Ball Valve – this type of valve is attached and held to the stem, this will cause the ball to float slightly to the downstream and when it occurs, the ball will be pressed against seats that create a positive seal.
• Rising Stem Ball Valve – it integrates the tilt and turn operation which eliminate the primary cause of valve failure, the seal rubbing.

In addition there are three (3) basic bore types for ball valves that have different uses and construction.

• Full Port Ball Valve – has bore internal diameter which is approximately equal to pipeline internal diameter that permits to reduce the pressure loss and friction across the valve.
• Reduced Port Ball Valve – also known as reduced bore, the bore of the ball is reduced up to one or two nominal sizes. This type of ball valve provides a restricted flow path which generally results in higher energy losses.
• V-Port Ball Valve – this type of valve has either V shape seat or V shaped ball, it controls the velocity as required by the application.

Ball valves can support temperature up to 500ºC (752 ºF) and pressure for about 1000 bar depending on the material used and designed. And the typical range size of ball valve is from 0.5 cm to 121 cm (0.2 to 48 inches). It can be made from plastic, metal or metals that consist of ceramic and the floating ball is commonly chrome plated to establish durability and can be actuated by electric and pneumatic actuators.

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