The use of high temperature ball valve and the matters needing attention
Publish Time: 2016-09-30 Origin: Site
High temperature ball valve for metal seal structure, sealing for the metal to metal seal, can exchange the metal sealing ring to metal seal, stainless steel plate and graphite composite plate sealing ring to metal seal.Hard seal butterfly valve drive form in addition to the electric and manual, worm gear drive, pneumatic, etc.High temperature ball valve, butterfly plate installed on the diameter of the pipe direction.Within the cylindrical passage hard seal ball valve body, disc disc around the axis of rotation, rotation Angle for 0 ° ~ 90 °, rotate to 90 °, the valve is fully open.
One, due to multi-layer soft fold type sealing ring fixed in the valve plate, when the valve plate normally open state media on the sealing surface to form positive scour, soft sealing strip of metal sandwich after flushing, directly affect the sealing performance.
Second, restricted by structure condition of the structure does not adapt to do below path DN200 valves, because the valve plate structure is too thick, large flow resistance.
Third, because of the principle of triple eccentric structure, between the sealing surface of valve plate and valve seat sealing is to rely on the drive torque valve plate pressure to the valve seat.Is flow state, the higher the medium pressure seal compression tight.When the countercurrent flow medium with the increase of medium pressure valve plate and valve seat unit is less than the pressure medium, the positive pressure between seal began to leak.
The above is about the use of high temperature ball valve and matters needing attention of related introduction, hope to be able to help to you.