Metal seated ball valves VS metal seated butterfly valves
For heating pipeline with high temperature steam, we generally choose metal seated ball valves and metal seated butterfly valves. Now we will make a comparison of their performance.
Metal seated ball valves | Metal seated butterfly valvest | |
Sealing performance | Bidirectional zero leakage | Bidirectional ANSI V Class |
Liquidity | Full bore , large flow | In the open state of the butterfly valve, the valve plate and valve shaft occupy a part of the flow channel . The smaller the diameter, the more they occupy the flow channel |
Operating torque | With the increase in ball diameter of seal face contact area times the square will also increase large | Torque than the small |
Operating temperature | Metal to metal configuration for high temperature | Butterfly valve can be used in conventional saturated steam medium for heating ( below 350 degrees) |
Service life | Longer life | Metal-to-metal seal structure for long life |
cost | The process is complicated and the cost is high | Small size , light weight and low cost |
To sum up, in the general pipe network of central heating, the cost performance of ball valves below DN300 is better, and the cost performance of butterfly valves above DN300 is better . This is also the choice of many years of experience for most designs and users