Control valve stuffing box and packing structure

The control valve stuffing box used for the following purposes.
1 is provided on the valve stem or shaft seal. Since the stem and the valve shaft is movable member, they are in the process of control valve operation changing position, therefore, requires the stuffing box seal.
2 to provide a friction as small as possible and as long as the life. Static friction (torque) due to the valve stem or valve shaft when moving and dynamic frictional force (torque), so that the deterioration of the static and dynamic performance of the control valve, therefore, to choose the appropriate fill
The stuffing box and packing structure so that the friction is reduced to a minimum, the longest service life.pneumatic hand valve
The control valve selection is generally considered less control valve operating temperature, pressure, flow characteristics, flow capacity and choice of material, the stuffing box and packing structure design and selection considerations. With the improvement of quality control requirements of the control system, the improvement of environmental requirements, the requirements of the control valve leakage continuously improve, stuffing selection and structural design is becoming increasingly important, stuffing and stuffing and structure considerations on the agenda. Some manufacturers have done a lot of laboratory test on the type of filler, filler structure to obtain useful experimental data, make stuffing and packing structure is more reasonable.steam solenoid valves