The sealing surface structure of the handle wafer butterfly valve is the key to ensure the reliable sealing of the valve and which is an important basis for judging the performance of the valve. The sealing performance relates to whether the butterfly valve can perform normal adjustment and cut-off medium work. In general, the sealing surface consists of the valve seat and the plate of the butterfly valve,which rely on the close contact of the valve seat with two or more precision-machined and abraded sealing surfaces on the disc, or the sealing achieved by the plastic deformation of the sealing surface after compression.
The sealing face of the handle wafer butterfly valve:
1, Resistant to media corrosion;
2, Wear-resistant friction;
3. Ensure reliable sealing under current working conditions;
4, Good processing technology;
5, Easy to assembly and maintenance.
The sealing surface form of Bundor handle wafer butterfly valve
There are several forms of valve sealing surfaces, including flat seals, cone seals, spherical seals, and knife seals. The handle type wafer butterfly valve is mainly flat surface sealed and spherically sealed.Compared to other types of seals, flat seals have their own unique advantages, the most important being the ease of processing and repair. If used in the cut-off valve, it can also make the valve open and close without friction.
Spherical seal means that one of the two contact surfaces of the seal is a spherical surface, and a butterfly valve with good sealing performance, a ball valve, and some small-diameter globe valves are used more often. The advantage of spherical seals is the large sealing ratio and good sealing performance. The disadvantage is that maintenance is difficult.
There are many types of fastenings for the seal face of the handle waferbutterfly valve, which are mainly determined according to the conditions of the medium used, such as the pressure, temperature, and corrosivity of the medium, the nature of the seal ring material and the material of the housing. The basic requirement for the fastening of the valve sealing ring is to have a good seal on the joint surface, which is convenient for processing, convenient maintenance, reliable connection and durability.