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Views: 44 Author: Amy Xiong Publish Time: 2024-11-15 Origin: www.wktipvf.com
Are you looking for butterfly valves for your ship or marine applications? Welcome aboard. Butterfly valves are used as a crucial component in many municipal, industrial, and commercial systems to control the flow of gases and liquids. In any shipboard system, be it liquid or gas, the proper functioning of the system depends on the shut-off valve. It may not seem like much, but selecting the right one can really make all the difference.
A butterfly valve is rather simply built, with fluid flow being managed by disc rotation. In the closed position, the disc blocks the flow through the valve bore while in the open position, it pivots perpendicular to the direction of flow. Butterfly valves are usually designed for bidirectional flow and shutoff capable. There isn't full bore on them; this makes them unsuitable for pigging or swabbing. The body material is ductile iron with an epoxy powder coat on both internal and external surfaces. Typically, these valves are operated manually with handwheels, gears or actuators — or some combination of these — based on what is needed for a specific application according to technical specifications.
The most common body arrangements for a butterfly valve are wafer and lug; the bodies can fit between two pipe flanges. Protruding lugs in the lug's body provide bolt holes that match those in the pipe flange. On the other hand, the wafer's body has no protruding lugs. Rather, it is surrounded by flange bolts and sandwiched by pipe flanges. Butterfly valves' materials for the flange type are selected based on what kind of liquid needs to be stopped moving, the pressure and temperature of the current application.
The disc is the part that revolves 90 degrees or a quarter turn and is movable which governs flow through the valve. It is the counterpart of flow closure in a butterfly valve. In a plug valve, it is the counterpart of a ball. A gate valve is counterpart of a gate.
One surface in the body referred to as the seat makes contact with the disc and effects a tight shut-off. It can be a metal seat, a resilient seat, or a fire-safe seat that isolates the pressurized fluids and combustion gasses from the manifold.
The stem of the butterfly valve may have a single or double-piece shaft structure. In most resilient sitting designs it is shielded from most media, on the flip side with high-performance butterfly valve designs the stem is in contact with the media.
Butterfly Valve is suitable for large valve applications due to its compact, lightweight design that requires considerably less space as compared to other valves.
Due to a quick operation, it needs less time to open or close
The maintenance costs are usually low compared to other valve types
A pressure drop across a butterfly valve is small
Valve with Non-metallic seating can be used in chemical or corrosive media.
Throttling is limited to low differential pressure services and that too with a 30- to 80-degree disc opening.
There is a chance for cavitation and choking as the disk is always in the flow Turbulence flow can affect the disc movement.
A Butterfly valve is a quarter-turn rotary motion valve that is used to stop, regulate, and start the flow. Butterfly valves are a quick open type. A 90° rotation of the handle can completely close or open the valve. Normally, they are used in systems where a positive shut-off is not required. In this article, you will learn about the following types of Valve.
Wafer Type
Lug Style Type
Flanged Type
Butt Welded Ends Types
Zero offset
Double Offset
Triple Offset
Butterfly valves can be easily fitted and operated for simple open/close operations when paired with various actuators. The disc, a metal ring in the middle of the pipe and connected to an external actuator by a rod, is the central part of a butterfly valve. They are quite popular in the valve industry.
Large butterfly valves frequently use an actuator of the gearbox type, in which the hand wheel is linked to the stem by a gearbox.This will lessen the force, but it will also slow down the process. Installing this kind of valve in the open position is recommended. During installation, if the valve is closed, the rubber seat will jam up on the valve disc and be challenging to open. In contrast to a ball valve, a butterfly valve’s disc is constantly in touch with the fluid being transported by the pipeline, resulting in a pressure drop.
The number of butterfly valve manufacturers has risen in China these years.China is improving its manufacturing methods, though its ranking is increasing. Butterfly valves will use different materials within their construction. The reason is to gain the best combination of operationality and cost. A butterfly valve regulates or isolates the flow of fluid.
