Butterfly valves are one of the most commonly used sanitary valve that is available in many different brands as well as sizes. They can also be actuated with different methods. Some of these valves can be operated manually by using handles while some of them can be operated automatically with the help of remote switch. There are number of applications for such valves right from drainage flow control to laboratory production process. Valve seats for these valves are made from materials like Silicon, Viton and EPDM. Surfaces of these valves are made from different grades of stainless steel and few other hygienic materials.
Some of the different types of butterfly sanitary valves are as follows:
- BV6 sanitary butterfly valves
These types of butterfly valves are meant for number of applications that use stainless steel pipes. The actuators for BV6 are available in 3 standard variants which are either normally closed or normally open or activated by air. The actuator will work by transforming the piston’s axial movement into rotation at 90 degree to the shaft of valve.
As the valve disc is located near the body of valve, it makes a contact with butterfly valve seal, so the torque of actuator is increased to close the valve. By choosing different position of hand grips, like open, close, central and any other position, it is possible to lock mechanically in number of positions. With these positions, it is possible to regulate the flow rate.
- Split sanitary butterfly valves
These types of valves are designed in order to eliminate any atmosphere contamination during the time when powders are transferred. In the production or laboratory environment, it is expected that charge or discharge must take place in dust free condition. With the help of these valves, it is possible to get high containment during loading/unloading or sampling process. These valves have both active and passive half. Active half drives are in fact is driving half while the passive half is half driven part. Two halves are fitted together in their axis of rotation. Sealing of disc is done on outside with metal seal.
With these valves, not only the operator and the product get the protection but also the environment. There is no chance of any cross contamination. Over a long period, they offer a sustained confinement level.
- Dixon sanitary butterfly calves of steel
These types of valves can be utilized as any throttling valves for controlling flow or as stop valve with off/on service. It can be operated either pneumatically or electrically.