Sphere and necessary preloaded pressure pneumatic valve seat

to ensure low pressure sealing, sphere and pneumatic seat than necessary for the preload pressure should not be less than KGF/om,. Pre tight seal depend mainly on the elasticity of pneumatic valve seat itself, so the width of the sealing surface is restricted by a certain limit, the above two figure M a N lines, which is determined by structural reasons. As can be seen from the two figure, ptfe plastic seal when Dg = mm maximum medium pressure P = kg interface c peng, drugs and by the sealing ring, the same size largest medium pressure P 2 KGF, lom,. Therefore, card drugs pressure pneumatic seat ball valve application scope to expand twice. But the use of drugs for the OC to 10 ℃ temperature, and the use of ptfe plastic temperature range for the OC to ten in addition, karp LongHua stability is much lower than teflon, so drugs only applies to the corrosive medium, such as: air, water, hydrocarbon, etc. Floating ball pneumatic ball valve is generally on the pneumatic valve seat, which is along the flow direction of medium pneumatic valve seat to ensure that the second seal. Top pneumatic valve seat to ensure that the floating ball seal is not allowed. Unless with other forms of pneumatic valve seat. This is due to the medium pressure of work is not