Do not use air conditioning water system hard seal butterfly four fluorine pneumatic valve or butterfly pneumatic valve what reason

do not use air conditioning water system hard seal butterfly four fluorine pneumatic valve or butterfly pneumatic valve what reason?
in the air conditioning water system is used to cast iron, nodular cast iron as the main structure, the centerline of the EPDM EPDM for seal soft sealing butterfly pneumatic valve. Air conditioning water system adopting pneumatic valve only because this kind of structure type of butterfly butterfly pneumatic valve is cheap?
with the improvement of pneumatic valve manufacturing technology, especially with the triple eccentric multi-level hard seal butterfly pneumatic valve and the emergence of double eccentric high-performance butterfly pneumatic valve, greatly extend the service life of the pneumatic valve adjustment, not only can be used in high temperature environment, can also be used for particle type, paste fluid special conditions, such as air conditioning why still choose middle iron pneumatic valve? By the analysis for everybody.
the first analysis of the use of air conditioning plumbing butterfly pneumatic valve under the environment: heating water quality of secondary water PH value, temperature for ~ ℃; Pressure or less commonly. MPa； Temperature, air conditioning cooling water glycol, etc. , for - ℃ ~ ℃; Pressure or less commonly. MPa；
in analysis: air conditioning water system is not suitable for using metal hard seal butterfly four fluorine pneumatic valve or butterfly pneumatic valve, metal hard seal butterfly pneumatic valve is allowed to leak into, and large leakage: ml X DN ( GB / T - ） ； Four fluorine pneumatic valve adjustment is only suitable for high temperature ( ℃ or higher) , because of four fluorine plastic, only at high temperature to soften, sealing effect is good; Do not emphasize 'cast steel' in the technical requirements, 'eccentric' requirements, because these are the four fluorine pneumatic valve or hard seal butterfly butterfly, the characteristics of the pneumatic valve rubber sealing butterfly pneumatic valve generally adopt pneumatic valve body, the midline of ductile iron butterfly plate; Epdm heat resistance can reach ℃, can work long hours in ℃ above, can completely meet the requirements of heating, air conditioning system.