Selection of fixed ball valve Q47 Q347
Thread Content
Project design pressure 1.3MPa Design temperature 90℃ Starting from DN125, fixed ball valves Q47 Q347 are used. Which is more widely used and from what aspects?
Most of the ones I've seen are floating. Very little fixation.
For DN150 and above, 347 is considered, mainly considering the switching strength. Large diameters can use turbine transmission to switch easily, while small diameters can use handle transmission. It’s best to use 347
The main problem is torque. Generally speaking, high-pressure ball valves exceeding DN100 should use Q347 turbine transmission. Compared with the handle, it will save a lot of effort.
Just choose the floating ball, no need to add turbine for DN125
Manufacturers of fixed ball valves with small diameters cannot make them, so they consider using floating ball valves.
DN125, nominal pressure 1.6MPa, and the temperature is not special, so consider using a floating ball structure to meet the needs.