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What are the sealing characteristics of high-temperature ball valves?
Published on: October 26, 2020 Font size:largeinSmall
The sealing characteristics of are as follows: 1. The high-temperature ball valve adopts a metal sealing pair, which is suitable for a wide temperature range and is conducive to coordinating the temperature difference deformation. 2. The defect of high-temperature ball valve with metal sealing pair is that the material hardness is high and the specific pressure required for sealing is high;Even if the pre tightening force is used to achieve the sealing, the valve seat and ball will be greatly worn due to the large sealing pressure.Therefore, high-temperature ball valves are gradually converted to elastic sealing pairs;The elastic sealing pair has reliable performance, strong elastic compensation ability and wide temperature range, which is applicable to both floating ball valve and fixed ball valve. 3. Under the action of preload and fluid pressure, the valve seat and ball of high-temperature ball valve are pressed tightly, so that the sealing surface of the valve seat is deformed and sealed.The sealing specific pressure qb between the valve seat and the ball shall be large enough and meet the following requirements: qb<q<[q].(qb - the minimum specific pressure to ensure the sealing of the ball valve, q - the actual specific pressure when the ball valve is working, [q] - the allowable specific pressure of the valve seat material)
