The high temperature and high pressure ball valve has a small opening and closing force, and the medium can flow in two directions. The sealing surfaces of the high-temperature and high-pressure ball valve are in contact with each other only when they are completely closed, and the relative slip of the forcibly closed valve core and the sealing surface is small, so the wear of the sealing surface is also very small. The wear of the sealing surface is mostly due to the
There is debris in front of the cover, or it is caused by high-speed scouring of the medium due to the improper closed state.
When the high temperature and high pressure ball valve is installed, the medium can enter from below the valve core and enter from above in two ways. The advantage of the medium entering from below the valve core is that the packing is not under pressure when the valve is closed, which can prolong the service life of the packing and can replace the packing when the pipeline before the valve is under pressure. The disadvantage of the medium entering from below the valve core is that the drive torque of the valve is large, the axial force on the valve stem is large, and the valve stem is easily bent. For this reason, the medium is fed from below
The entry method is generally only suitable for small-caliber ball valves, and the force of the medium acting on the valve core when the valve is closed is not more than 300 kg.
Compared with ordinary valves, the high temperature and high pressure ball valve has the advantages of simple structure, good sealing performance, and convenient manufacturing and maintenance; the disadvantage is that the liquid resistance is large, and the opening and closing force is large. It is a fully-open and fully-closed valve, which is used to cut off or connect the medium and is not suitable for adjustment.