Sanitary ball valves are designed to control product transmission. They are mainly used in chemical pharmaceutical, food and beverage industries. The entire bore design of chamber valves does not result in fluid resistance. This means that the use of ball valves is ideal in operations involving viscous fluids or fluids that contain particulates.
1. Configurations of Sanitary Ball Valves
Some sanitary ball valveshave 3 configurations. Three-piece ball valveshave two flanges, two PTFE valve seats and one valve body. The installation takes place on the threaded ends. You can install valve seat cleaning adaptors to facilitate the cleaning of valve chambers. The drainage hole is responsible for discharging all the drainage.
The second configuration is a three-way ball valve. This has one valve body, PTFE valves seats and valve covers. It has threaded holes for installation.
The third configuration is a two-piece ball valve. It has two PTFE valve seats, valve adaptors and one valve body. The valve has clamped ends for installation. To facilitate cleaning the chamber, it can be fitted with valve seat cleaning adaptors. All the drainage is discharged from the drainage hole.
2. Assembly of Sanitary Ball Valves
Welded Ball valves -The assembly of these types of valves involves complete welding. No leaks are experienced through bolt connection or other joints. These valves cannot be serviced or maintained. Welded ball valves are usually used in applications where no maintenance is expected. These include buried or underground applications like sub-sea applications and gas transmission.
Top entry ball valves - These valves are assembled with the ball part from the top side. They resemble a globe valve with a body and bonnet, only that the on the slim part, a ball valve is used. This valve consists of a single body. Top entry sanitary ball valves are usually made from casting metal. Due to the use of casting metal, additional NDE tests are required to ensure there are no defects resulting from the casting process.
Top entry valves are ideal for applications that need very little disassembly. Minimal in-line maintenance is done on its internal components. It is common in high-temperature applications that don’t need much maintenance like the High Integrity Pressure Protection System (HIPPS). One advantage of the top entry ball valve lies in its construction. This allows very little thread connection which in turn leads to the creation of minimal leakage passages.
Side entry ball valves- These are assembled with the ball from the side. The assembly usually involves two-piece or three-piece body parts. A bolt or a stud is used to assemble each body part in a similar manner as joining two flanges. These valves are usually made from forge metal. Each component is forged separately before being assembled. This type of construction minimizes defects that are common in the casting process. These types of sanitary ball valves are easy to assemble as their trim components easily align together.