What material is used for wafer butterfly valve?-stainless steel, cast iron and cast steel wafer butterfly valves

Wafer type butterfly valve is one of most widely used industrial butterfly valve in various pipelines to connect, cut off and regulate the medium flow. 

According to different end connection, we have wafer type butterfly valve and flange type butterfly valve. For wafer type butterfly valve, with different material used, wafer butterfly valve can be used for different mediums. Today we are gonna talk about what is the common materials used for wafer type butterfly valve, and what mediums different material wafer butterfly valve can be used for:  

The common three types materials used for wafer type butterfly valve are cast iron, cast steel, and stainless steel; 

1. cast iron wafer butterfly valve

1.1. gray cast iron butterfly valve:

gray cast iron butterfly valve is usually suitable for weak acid and weak alkali mediums such as water and air, but not suitable for pipelines with perhydrochloric acid and nitric acid mediums; 

1.2. ductile cast iron wafer butterfly valve:

ductile cast iron wafer butterfly valve has certain corrosion resistance, and its performance is much higher than that of gray cast iron wafer butterfly valve. The applicable mediums of ductile cast iron butterfly valve includes steam, general gas and oils,etc; 

2. cast steel wafer butterfly valve: 

The advantages of cast steel wafer butterfly valve are greater design flexibility and variability, which improves overall structural strength and a wide range of weight variations. The performance of cast steel wafer butterfly valve is better than that of the cast iron wafer type butterfly valve, but not as good as that of the stainless steel wafer butterfly valve. Cast steel wafer butterfly valve is suitable for mediums like steam, non-corrosive gas, oil, etc; 

3. stainless steel wafer butterfly valve: 

Stainless steel wafer type butterfly valve has the best performance, and can be used in more severe working conditions. Stainless steel wafer butterfly valve can be used in some ultra-high temperature, ultra-low temperature, and some acid-base corrosive medium pipelines. At the same time, the stainless steel wafer type butterfly valve is more wear resistant and has the longest service life; 

Butterfly valve is widely used in various industrial pipelines to connect, open and close the medium flow, which includes valve body,valve disc, valve seat, bushing, O type sealing ring, valve stem, connect bolts and nuts, pin, and actuating device( line lever handle, worm gear box, electric actuator, pneumatic actuator. According to different structure, butterfly valve is divided into center line butterfly valve(concentric butterfly valve), eccentric butterfly valve(offset butterfly valve)( which includes single eccentric butterfly valve, double eccentric butterfly valve, triple eccentric butterfly valve). According to end connect, butterfly valve has wafer type butterfly valve and flange type butterfly valve. According to different actuating device, we have manual lever handle butterfly valve, electric butterfly valve, pneumatic butterfly valve, butterfly valve with worm gear box. According to different material, there are ductilecast iron butterfly valve, stainless steel butterfly valve, WCB butterfly valve. According to different sealing material used, there are soft sealing butterfly valve(rubber lined soft sealing butterfly valve, PTFE lined soft sealing butterfly valve) and metal hard sealing butterfly valve. 

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