Air conditioning water system does not use a hard seal butterfly valve or PTFE valve.
Air conditioning and heating systems are used in cast iron, ductile cast iron as the main structural parts, three yuan ethylene propylene rubber EPDM as the seal of the middle line of the soft sealing butterfly valve. Air conditioning system is only because of the butterfly valve butterfly valve structure is cheap.
Along with the technical level of the valve manufacturer to improve, especially with the emergence of three eccentric hard seal butterfly valve and double eccentric butterfly valve with high performance, greatly prolong the service life of the butterfly valve, not only can be used in high temperature environment, can also be used for granular, pasty fluid and other special conditions, air conditioning why still choose midline iron valves.?
The first analysis of the use of the environment: air conditioning plumbing valve heating water two times water pH value is 9 ~ 12, temperature is 40 to 80 DEG C; pressure is generally less than 2.5MPa; 2, air conditioning cooling water glycol, temperature is - 6 DEG C to 37 DEG C; pressure is generally less than 2.5MPa;
It is not suitable for air conditioning water system using metal seal butterfly valve or PTFE sanitary butterfly valve, metal seal butterfly valve is allowed into the leakage; PTFE butterfly valve is only suitable for high temperature (100 DEG C), because PTFE belongs to plastic, only at high temperature it becomes soft, the sealing effect is good; the technical requirements do not emphasize "steel" and "eccentric" such a demand, because these are the characteristics of PTFE butterfly or hard sealing butterfly valve, soft rubber sealing butterfly valve is generally used ductile iron body, midline butterfly plate; three EPDM temperature is up to 120 degrees. You can work for a long time in more than 100 DEG C, and can fully meet the requirements of heating and air conditioning system.