A long pattern flange concentric butterfly valve is a type of valve used in piping systems for regulating or isolating the flow of fluids. Let's break down what each term means:
Butterfly Valve: This is a type of quarter-turn valve that uses a circular disc or vane with its pivot axis at right angles to the direction of flow in the pipe. When the valve is fully open, the disc is turned parallel to the direction of the flow, allowing for minimal obstruction and low-pressure drop.
Concentric: In the context of butterfly valves, this typically refers to the configuration where the center of the disc is positioned in the centerline of the pipe bore when the valve is fully closed. This design offers uniform sealing around the disc perimeter and minimizes pressure drop.
Long Pattern: This indicates that the valve has an elongated body or neck, providing extra clearance between the valve disc and the pipe bore. Long pattern valves are often used in applications where there are space constraints or where insulation thickness requires additional clearance.
Flange: This refers to the end connection of the valve. Flanges are typically used to connect valves to piping systems. A long pattern flange concentric butterfly valve would have flanged ends for bolting to the corresponding flanges on the pipe.
In summary, a long pattern flange concentric butterfly valve is a valve with an elongated body, flanged ends, and a concentric disc design used for regulating or isolating fluid flow in piping systems, offering minimal pressure drop and uniform sealing.
The difference between a U-type butterfly valve and a long pattern butterfly valve lies mainly in their design and application:
Design:
U-Type Butterfly Valve: A U-type butterfly valve is characterized by its distinctive U-shaped body. This design often features a short face-to-face dimension, making it compact and suitable for applications where space is limited.
Long Pattern Butterfly Valve: On the other hand, a long pattern butterfly valve has an elongated body or neck, providing extra clearance between the valve disc and the pipe bore. This design is particularly useful in applications where there are space constraints or where insulation thickness requires additional clearance.
Application:
U-Type Butterfly Valve: U-type butterfly valves are commonly used in applications where compactness is crucial, such as in tight spaces or where there are piping layout limitations.
Long Pattern Butterfly Valve: Long pattern butterfly valves are often preferred in applications where additional clearance is needed between the valve disc and the pipe bore. This could be necessary to accommodate insulation thickness or to provide easier access for maintenance.
Pressure Drop and Flow Characteristics:
Both types of valves can be designed to minimize pressure drop and provide efficient flow control. However, the specific design features of each type may influence their performance characteristics.
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