The sealing pair of the globe valve can use metal seal and soft seal. When using metal seals, not only does the sealing stress need to be high, but it also requires uniform force on all sides to achieve the required sealing performance. These requirements have led to many seal designs.
The advantage of flat seal globe valve is that there is no friction when the contact surface is close. Therefore, the guidance of the closure is not important, and the requirements for the scratch resistance of the sealing surface material are not strict. At the same time, when the roundness of the sealing surface is deformed due to pipe stress, it will not affect the sealing performance of the sealing surface. If the medium flows from the globe valve seat, solid particles and sediments in the medium must be prevented from damaging the sealing surface.
