1. From temperature, due to the seal material and structure of ball valve is not suitable for steam medium, and the butterfly valve can be used to the conventional heating with saturated steam medium (350 degrees).
2. From the pipeline stress under perspective, due to the structure of the valve, butterfly valve can withstand stress is higher.
3. From the point of life, ball valve and butterfly valve can achieve long life (the normal use of more than 15 years), but the ball valve seal structure of non-metallic play an important role, and butterfly valves for pure metal to metal seal, so usually the life of the butterfly valve will be a little longer.
4. From operating torque for, because for triple eccentric metal sealing butterfly valve, butterfly valve and butterfly valve opening and closing of the torque is very small, and the ball valve along with the increase of the diameter of the sealing surface of the contact area with the increase of times square, large diameter valves open and close at moment will be very big.
5. From the volume and weight also is convenient installation Angle, valve under 12 better, more than 12 valves lighter volume.
6. From the consideration on the sealing performance, ball valve sealing performance is better than the butterfly valve, ball valve is bi-directional zero leakage.Butterfly valve is bi-directional ANSI grade V standard (no leakage).So both are sufficient to meet the demand of heating pipe network, normal maintenance and repair of pipe network will not affect.
7. From the Angle of price, DN250 (including) diameter ball valve under the price will be better, more than 12 caliber of butterfly valve price will have more advantages.
To sum up, in the central heating pipe network, the better cost performance under 12 diameter ball valves, more than 12 diameter butterfly valve more outstanding cost performance.This is most of the design and selection of the users experience for many years.