butterfly valve is one of the two types of typical Marine valve factory production of butterfly valve, wafer type valve body ( Sometimes referred to as the no flange body) Is - A flat body, its size is very small, face to face is approximately equal to twice the required wall thickness and packing (the width of t Figure 4. 20) , in this size, valve disc in the closed position, must take the seat and body within the flow of parts.

because of leaf type valve has a small face-to-face dimensions, connects the two pipe joint with direct bolt flange is feasible, without fear of leakage caused by thermal expansion. Marine Industrial Valves factory production of curtain type valve is typically used for 12 in ( DW300) The following small size. When expectations have larger degree of thermal expansion, or adjust the elements in a leaf type body can't cooperate, would adopt another size is flanged valve body, it is used for larger butterfly valve [ 14in( DW350) And a bigger] And need a larger face-to-face dimensions ( Figure 4. 21) 。

the valve products with flange on the Industrial Valves body is match the standard pipe flange of the integral flange, as shown in figure 4. 22. Another min size is lug type valve, butterfly valve body on one integral flange, the flange with the unified pipeline flange hole. Each with a taper hole from every direction and meet in the hole at the center of the line. This arrangement makes the body lies between two flanges. And then through the pipeline flange insert stud body integral flange.

Marine valve factory butterfly valve design after sure stud screw people integral flange, Marine butterfly double bolt screw up your business will be pipeline flange fixed on the valve body. Lug type body through bolts will not be used for working conditions, such as thermal expansion, or not allowed to use two integral flange of smaller size valves.

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