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  AKTIVITAS :  25/11/2020

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  • BUTTERFLY VALVE Lever Handle Type ( 2

BUTTERFLY VALVE Lever Handle Type ( 2

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02 / 09 / 2020
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Detail BUTTERFLY VALVE Lever Handle Type ( 2

The butterfly valve has been in use since the late 18th century. James Watt used a butterfly valve in his steam engine prototypes. With advances in material manufacturing and technology, butterfly valves could be made smaller and withstand more-extreme temperatures. After World War II, synthetic rubbers were used in the sealer members, allowing the butterfly valve to be used in many more industries.[2] In 1969 James E. Hemphill patented an improvement to the butterfly valve, reducing the hydrodynamic torque needed to change the output of the valve

Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they cost less than other valve design, and are lighter weight so they need less support. The disc is positioned in the center of the pipe. A rod passes through the disc to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, so it induces a pressure drop, even when open.

A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.

There are different kinds of butterfly valves, each adapted for different pressures and different usage. The zero-offset butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. The high-performance double offset butterfly valve, used in slightly higher-pressure systems, is offset from the centre line of the disc seat and body seal (offset one), and the centre line of the bore (offset two). This creates a cam action during operation to lift the seat out of the seal resulting in less friction than is created in the zero offset design and decreases its tendency to wear. The valve best suited for high-pressure systems is the triple offset butterfly valve. In this valve the disc seat contact axis is offset, which acts to virtually eliminate sliding contact between disc and seat. In the case of triple offset valves the seat is made of metal so that it can be machined such as to achieve a bubble tight shut-off when in contact with the disk .













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VALVE GEARBOX , VALVE GEAR STORE , VALVE GEAR CAR , CONTROL VALVE POSITIONER , CONTROL VALVE EXCAVATOR , VALVE LIFTER , VALVE INDEX , VALVE SPECTRA , VALVE STOCK , VALVE JAKARTA , VALVE BEKASI , VALVE JAKARTA , VALVE BANDUNG , VALVE BALI , VALVE MAKASSAR , VALVE INDONESIA , CONTROL VALVE MURAH, CONTROL VALVE STOCK .

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pt. unggul daya pratama
pt. unggul daya pratama

PT. UNGGUL DAYA PRATAMA

Jl. Rasamala Raya Blok L10 No 14
Perumahan Telaga Pesona
Telaga Murni - Cikarang Barat
Bekasi, Bekasi
Indonesia 17520
Bekasi
25 / 11 / 2020

Detail BUTTERFLY VALVE Lever Handle Type ( 2

The butterfly valve has been in use since the late 18th century. James Watt used a butterfly valve in his steam engine prototypes. With advances in material manufacturing and technology, butterfly valves could be made smaller and withstand more-extreme temperatures. After World War II, synthetic rubbers were used in the sealer members, allowing the butterfly valve to be used in many more industries.[2] In 1969 James E. Hemphill patented an improvement to the butterfly valve, reducing the hydrodynamic torque needed to change the output of the valve

Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they cost less than other valve design, and are lighter weight so they need less support. The disc is positioned in the center of the pipe. A rod passes through the disc to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, so it induces a pressure drop, even when open.

A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.

There are different kinds of butterfly valves, each adapted for different pressures and different usage. The zero-offset butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. The high-performance double offset butterfly valve, used in slightly higher-pressure systems, is offset from the centre line of the disc seat and body seal (offset one), and the centre line of the bore (offset two). This creates a cam action during operation to lift the seat out of the seal resulting in less friction than is created in the zero offset design and decreases its tendency to wear. The valve best suited for high-pressure systems is the triple offset butterfly valve. In this valve the disc seat contact axis is offset, which acts to virtually eliminate sliding contact between disc and seat. In the case of triple offset valves the seat is made of metal so that it can be machined such as to achieve a bubble tight shut-off when in contact with the disk .













TAGS

 

 

VALVE GEARBOX , VALVE GEAR STORE , VALVE GEAR CAR , CONTROL VALVE POSITIONER , CONTROL VALVE EXCAVATOR , VALVE LIFTER , VALVE INDEX , VALVE SPECTRA , VALVE STOCK , VALVE JAKARTA , VALVE BEKASI , VALVE JAKARTA , VALVE BANDUNG , VALVE BALI , VALVE MAKASSAR , VALVE INDONESIA , CONTROL VALVE MURAH, CONTROL VALVE STOCK .

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