Butterfly Valve Parts
Butterfly valve parts
The components of butterfly valves are made up of four main parts: the body, disk, stem, and the seat. In today's post, we'll take a closer look at how each of these parts allows the butterfly valve to perform in industrial applications.
What is the function of butterfly valve?
Butterfly valves are used where space is limited. Unlike gate valves, butterfly valves can be used for throttling or regulating flow as well as in the full open and fully closed position. The pressure loss through a butterfly valve is small in comparison with the gate valve.
What is butterfly valve types?
There are 3 main categories of butterfly valves: Rubber-lined, Plastic-lined, and Metal.
What controls the butterfly valve?
Butterfly valve actuation Electric: Uses an electric actuator for controlling the valve with a 4-20mA control signal and are typically used for high precision regulation and time-sensitive application. Pneumatic: Also used for high precision application and uses compressed air for actuation.
What is a butterfly valve actuator?
A butterfly valve actuator controls the flow of gas or liquid by means of a disk, which turns on a diametrical axis inside a pipe or by two semicircular plates hinged on a common spindle, which permits flow in only one direction.
Why is it called butterfly valve?
The butterfly valve gets its name from how the movement is similar to a wing for flight. The rod is analogous to a butterfly's body, while the disc moves like a butterfly wing. A butterfly valve's motion is similar to that of a butterfly that has landed with the wings moved up and down with a 90-degree motion.
What can go wrong with a butterfly valve?
The most common failure of a high performance butterfly valve is the rubber elastomer inside the butterfly valve. It can tear, wear, wear or perforate and even fall off after continuous use. The conventional thermal vulcanization procedure is not able to meet the repairs on-site.
Is a butterfly valve a control valve?
Indeed, butterfly valves are a type of control valve because they deal with controlling and regulating the flow of materials in a process.
How does a butterfly valve seal?
A butterfly valve is a quick opening, rotational motion valve that uses a metal, circular disc (vane) to start, stop or regulate flow in a pipe. Typically, a simple 90° rotation of the valves handle either opens or completely closes the valve as the vane seals itself against the seats in the valve housing.
What does API 600 mean?
API Standard 600, from the American Petroleum Institute, describes the criteria for valve design/construction and the material/trim designations for steel gate valves. The most recent version of this standard was published in January 2015, effective as of July 15, 2015.
What does API 598 mean?
API Standard 598, from the American Petroleum Institute, provides industry standards for valve ratings and valve leakage. The standard is currently in the 9th edition, which was released in 2009.
What is valve used for?
A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category.
How do butterfly valves allow water flow?
At the center of a butterfly valve is a rotating disc. Like ball valves, this movable element is controlled by the quarter-turn of a handle. When the handle is turned, this disc flares open, allowing fluid to pass through the pipe.
Do butterfly valves have a flow direction?
Butterfly valves can be bi-directional but do have a preferred flow direction, indicated on the body of the valve, It's however strongly recommended to install the valves in the preferred flow direction, as it will extend the valve's life span and will also lower the torque required to operator the valve.
What is stem in butterfly valve?
Butterfly valve Stem: The stem of the butterfly valve may be a one-piece shaft or a two-piece (split-stem) design. The stem in most resilient seated designs is protected from the media, thus allowing an efficient selection of material with respect to cost and mechanical properties.
How many types of valves are there?
All of the most common types of automated valves fall into one of three main categories. They are linear, rotary, and self-actuated. There are a variety of valve types within each of these categories each having its own benefits. This training course is focused on rotary and linear actuated valves.
What is the work of actuator?
An actuator is a device that produces a motion by converting energy and signals going into the system. The motion it produces can be either rotary or linear. An actuator is a device that produces a motion by converting energy and signals going into the system. The motion it produces can be either rotary or linear.
Is butterfly valve a non return valve?
The butterfly non-return valve is a typical non-return valve for water systems. In size classes greater than DN 100, the flow resistance is clearly lower than in the case of the RK model.
Do butterfly valves require gaskets?
The seat in a resilient-seated Butterfly valve usually extends around to both faces of the valve. As a result, no gaskets are required as these seats serve the function of a gasket. The seat material which extends past the face is compressed during installation and flows toward the centre of the valve seat.
What are the advantages and disadvantages of butterfly valve?
ADVANTAGES OF BUTTERFLY VALVES
- Lightweight and Compact.
- Simple and Cost Effective. ...
- Quick and Efficient. ...
- Pressure Control. ...
- Corrosion and Viscous Fluids. ...
- Cavitation and Choked Flow. ...
- No High-Pressure Throttling.
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