Butterfly valve is one simple structural industrial valve, which is usually used as globe valve and regulating valve to connect, cut off and control of flow rate of mediums in low pressure pipeline systems.
There are different various types of butterfly valves, like with different structure, there are concentric butterfly valves and eccentric butterfly valves;
for different sealing materials, there are soft seal butterfly valves and metal hard seal butterfly valves;
with different end connect, there are wafer type butterfly valves, wafer lugged type butterfly valves, and flange butterfly valves;
with different operating device used, there are manual lever handle butterfly valves, worm gear box operated butterfly valves, electric actuated butterfly valves, pneumatic actuated butterfly valve;
with different material used for valve body, there are cast iron butterfly valve, cast steel butterfly valve, stainless steel butterfly valves.
1. flange butterfly valve and wafer butterfly valve are two different end connect butterfly valves. There is no much difference in their working principles: the operating device drives the valve stem to move, and the stem drives the butterfly plate to rotate to realize the opening and closing of the butterfly valve; their difference is mainly on different price and different installation method;
2. The price of wafer type butterfly valve is lower than that of the flange type butterfly valve. Therefore, when purchasing the butterfly valve, if there are strict requirements for cost control, it is recommended to use the wafer butterfly valve which has low price and light weight. Generally, the price of the wafer butterfly valve is only 2/3 of that of the flange end butterfly valve;
3. The installation bolts for wafer type butterfly valve are relatively long, and require high construction accuracy. If the flanges on both ends are not aligned during installation, the bolts will be subject to significant shear force, resulting in leakage. In addition, the wafer butterfly valves are not suitable for high temperature systems, because the bolts of the wafer butterfly valve will expand at high temperature, which will cause leakage. Flanged butterfly valves do not have those above problems, and flanged end butterfly valves are suitable for a wider range of working conditions.
4. There are no flanges at both ends of the wafer type butterfly valve body, and special flanges for wafer butterfly valves are required during installation. Compared with the flanged end butterfly valve, the wafer butterfly valve is more convenient to disassemble and its cost is lower. The disadvantage of wafer type butterfly valve is that if there is a problem with one sealing surface, both sealing surfaces need to be disassembled. The flanged end butterfly valve has flanges at both ends of the valve body. During installation, the flanges are connected with the pipe flanges, and its sealing performance is more reliable, but the cost of flange end butterfly valve is relatively high.
if you are purchasing butterfly valves, and have no idea what kind of butterfly valves should be used in your projects, kindly contact us, professional advice will be offered:
Belo Valve is a more than 15 years professional manufacturer for industrial valves, like butterfly valves( center line wafer butterfly valve, manual butterfly valve, lever driving butterfly valve, butterfly valve with worm gear box, lug type butterfly valve, soft seal butterfly valves, hard seal butterfly valves, flange butterfly valves, ductile cast iron butterfly valves, stainless steel butterfly valve), gate valves(including DINF4 gate valves, DINF5 gate valves, DIN3352 gate valves, rising stem gate valves, non rising stem gate valves, soft seal gate valves, hard seal gate valves, hydraulic gate valves, sluice valves), globe valves( DIN globe valves, bellows globe valves, electric globe valve), ball valves( welded ball valves, soft seal ball valves, stainless steel ball valves, WCB ball valves, ductile cast iron ball valves, API ball valves), check valves( wafer type check valves, swing check valves, rubber disc check valves, ball type check valve, foot valve/bottom valve), fire protection valves( grooved butterfly valves, grooved gate valves, grooved strainers, grooved check valves), hydraulic control valves,etc.