Technical Information
The functioning of a butterfly valve
The function of a butterfly valve is to control the flow of a medium through a pipe. In the cross-section of the flow, a rotatable disc ensures the required flow. If the disc of the butterfly valve is parallel to the flow, it is fully open.
Variants and differences
The butterfly valves from END-Armaturen are versatile valves that are flow-efficient in design and can be easily automated. In addition to long service lives and switching cycles, they impress with their robustness and adaptability.
Manual operated butterfly valves
Manual operation of the butterfly valves is possible with a worm gear or a hand lever. The hand lever can be adjusted in 10 locking positions and use a grid disc to show which position the valve disc is in.
Butterfly valves with pneumatic actuator
Pneumatically operated butterfly valves are used very frequently because they are much safer compared to electrical variants when used in a plant area that is at risk of explosion. Pneumatic actuation can be implemented using two types of actuators.
- Double-acting: The butterfly valve is opened and closed by compressed air.
- Single-acting: With pneumatic single-acting actuators butterfly valves, the valve is only actuated in one direction by compressed air. A package of springs is preloaded. The restoring forces of the springs then cause actuation in the other direction.
Butterfly valve with electric actuator
Both pneumatic and electrically actuated butterfly valves are particularly suitable for applications where the valves are to be operated very frequently or remotely. Pneumatically actuated butterfly valves should be selected in plant areas that are at risk of explosion, as they are then safer
Automatability of a butterfly valve
Butterfly valves can be operated manually or automatically. The automation here is associated with little effort. In order to design a suitable actuator for automation, the following questions must be answered:
- What is the torque of the valve disc?
- Is it a lubricating medium or not?
- Do you want electric, hydraulic or pneumatic actuation?
- How does the actuator work? (regulated or open-loop control mode, "open/closed" mode)
Spare parts for butterfly valves
Depending on the type of medium and the butterfly valve, the built-in sleeve may wear out. Sleeves are particularly stressed by aggressive media, for example due to mechanical or chemical effects. You will find a large selection of sleeves as spare parts for different series and sizes in our shop. Some sleeves have additional reinforcement rings for even greater resistance.