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Examples of Packing Combinations by Applications Page 1
EXAMPLES OF PACKING COMBINATIONS BY APPLICATIONS
Table PCA-2 lists examples by type of application. (1 of 2)
Because of no inversion and small coefficient of friction, no stick-slip occurs even at low speed. It can also be used at high pressure.
The life of the packing is extended by interrupting impact pressure with HBY and protecting IDI packing. Because oil film is thin with HBY and IDI, DWI with high dust resistance is used as dust seal.
When lateral load is small and there is no fear of ‘scuffing’ between piston head and cylinder tube, full function can be achieved with only one wear ring (WR) and the piston head can be made smaller.
HBI interrupts pressure and protects the packing same as above, but it is used for extremely short strokes.
Inversion does not occur and coefficient of friction is small like SPGW but it can be used at lower pressure than SPGW.
When impact pressure does not occur very often, bufferings of HBY and HBT are unnecessary. It can be used in an appropriate groove and DKBI is used for dust seal considering its low oil film scraping performance.
This is example of use where lateral load is small and there is no fear of ‘scuffing’ between piston head and cylinder. SPG is used at less than 280kgf/cm(2).
When impact pressure is very low and extrusion gap is small, it can be used without back-up ring.
When lateral load is small and piston must be made compact but still requiring pressure resistance, it is used by combining SPGW packings and WR.
It is used when impact pressure rarely occurs.
It is used at less than 280kgf/cm(2) with large lateral loads.