although Marine butterfly valve has been available since 1930, it is mainly used for driving a shut off valve, flow until the last 20 years for throttling operation. During the next 1970 years, Marine butterfly valve structure was improved, not only make it for more throttling condition, and also make it in some condition is better than globe valves. The cut-off valve and the difference between switch isolation valve is a name of high performance Marine butterfly valve. In simple terms, the high performance Marine butterfly valve is a 1/4 rotation ( 0°~ 90*) Rotary motion of the valve, it USES a rotating circular disc as regulating elements. Typically, Marine butterfly valve can be used to size from 2 to 8 in the in ( (to DN200) , the pressure levels for ANSII50 to 600 ( PN16 to PN100) ; 10 to 12 in the in ( DN250 to DW300) , pressure is the AN - S150 level to level 300 ( PN16 to PN40) ; 14 to 36 in the in ( DN350 to DN900) , the pressure for ANSI150 level ( PN16) 。

when the valve is fully open, MinPan actually has spread to the pipeline itself within, and make the Marine butterfly valve is different from other kinds of valve structure. Marine butterfly valve body compared with other types of valves, it has a very narrow face-to-face dimensions, can be installed between two flanges, the body without the need for special end connection. This type of arrangement is called a bolt through connection, and only use a certain bolt length. If the bolts for long. Bolt will l by thermal expansion of the process medium or external fire and cause leakage.

the original spiral control Industrial Valves is designed to be open - automatically Shut off valve, however, with the recent improvement become rotary valve actuator and the valve body assembly, now with additional actuator or actuator system, they can be used for throttling condition. Such as 3. Detailed in section 4, the family of Marine butterfly valve can be divided into two groups: one business and eccentric business valves. Concentric Marine working condition of butterfly valve is used to open a normal pass partition, it USES a simple + with body center line of valve plate. * normally, concentric Marine butterfly valves made of cast iron or other cheap metal manufacturing, and lined with rubber or polymers. Because of its low performance, they are often equipped with manual operator. In some cases, such as the working condition of throttling, manual operator will change for the actuator system. In most cases, a simple one Marine butterfly valve is used to open a close operation strictly. For throttling operation even when they themselves are not equipped with automatic control, and other specifically for throttle control structure is equipped with automatic control. This is because the concentric Marine butterfly valve was originally for open - Leave the partition operation and research and development. Concentric Marine butterfly valve with low amplitude range, and the throttling special industrial valves with the improved structure, make the whole trip has better flow control. ,

flow control valve has become a standardized way of dealing with os & y valve fire protection.
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