Butterfly Valve
Ductile iron Body and Disc PN16 Cast iron Butterfly Valve Gear Box
Products Feature
The split design are adopted for valve body and seat. It is easy maintenance and replacement.
In order to ensure the accuracy of body symmetry and reduce the torque of butterfly valve. Without lining rubber when machining valve body. It can avoid the pressure deformation of the lining rubber.
In order to beneficial to stem support, 4 oil proof bearing are equipped on valve and body. the upper shaft hole is equipped with 2 o-ring and 1 special rectangular screw ring water seal,which make s the axial seal more reliable.
In order to prevent damage of valve seat caused by the excessive extrusion, the 2ends of the valve plate shaft hole are designed with grooves. when valve shaft is loaded into valve to ensure the sealing of valve seat end face and the valve plate.
The butterfly valve has high strength and high corrosion resistance because the pin material have quenched and tempered.
Spring+U type card structure are used in the upper part of the stem, anti-exit structure are adopts in non-pin stem, which can not only prevent the stem from loosening, but also compensate for installation errors.
Which is better? Plastic butterfly valve and Metal butterfly valve?
This is a false proposition, because the uses of plastic butterfly valves and cast iron butterfly valves are completely different, and it can be said that they are not comparable.
Plastic butterfly valves are lighter in overall weigh, relatively simple structure. which also makes it has a more compact size, and installation and disassembly are very simple. Plastic butterfly valves are lighter in weight, which can reduce the load of pipe support and lower the project cost.
Plastic butterfly valves have good corrosion resistance to many common acids, alkalis, salts and other medium.Plastic butterfly valve is made of elastic sealing material with excellent sealing, which can effectively prevent the medium from leaking out.
Plastic valve can’t be used in high temperature and high pressure environments.
Ductile iron butterfly valve has the advantages of simple structure, small size, light weight, easy installation and maintenance. Its structure adopts the butterfly plate as the flow stopper to control the medium flow through the action between the rotating body and the fluid pipe. This structure makes the ductile iron butterfly valve easy to install and save space, suitable for small pipe diameter sealing requirements are not high occasions.
Pressure Resistance of Ductile Iron Butterfly Valve is not high.
Ductile iron butterfly valve is suitable for some systems with low working pressure, such as drainage, water supply and other occasions. In these occasions, its advantages of simple structure, small size, light weight and easy operation are fully utilized. However, due to its poor pressure resistance, it is not suitable for use in high-pressure and high-temperature environments.
Stainless steel has good corrosion resistance, has high strength and can withstand high pressures and temperatures.
Different industrial and mechanical systems require different specifications and types of butterfly valve control systems, while the specifications and types of metal butterfly valves have the different advantage of being very rich in type and highly adaptable to technology.
To sum up, plastic butterfly valve and cast iron butterfly valve are two kinds of butterfly valves with different materials and different purposes. It is not possible to directly compare the advantages and disadvantages of the two. Therefore, when choosing butterfly valves, you need to take into account the specific application scenarios and requirements to determine their suitability.
Specification
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