Kaco U-rings PNN…N and A

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In the fields of hydraulics and pneumatics, Kaco U-rings are most often used for sealing purposes on longitudinally moving pistons and rods. These are manufactured with various lip versions as has already been explained in more detail in the section on “structure and operation”.

The gap width between the housing and rod or between the piston and cylinder has a decisive influence on the useful life of U-rings. As a rule, this should normally not be more than 0.15 mm. Only in the case of pressures below 20 bar can a larger clearance be permitted. In the case of an excessively large gap, the sleeve rear deformed by the pressure gives way in the intermediate chamber. As a result of this, rubber particles are sheared off and the useful life of the seal is reduced.

The field of pneumatics is the main field of application for U-rings of the PNN…N and PNN …A series. These can have a sharp or rounded sealing edge. The design the nation provides information on the design of the sealing lips:

PNN…N  sharp sealing edge (trimmed)
PNN…A  rounded sealing edge (completely molded).

PNN…N series U-rings are also used for special hydraulic applications (e.g. water) (figure 26 shows an installation example). Support rings are necessary as the sealing lips must be removable in all cases and the edges may not come into contact in the axial direction. The height of the support ring must be such that approximately 0.5 mm space remains between this and the U-ring.

Technical data:

Pressure range                                  ≤  100 bar

Permissible sliding speed               ≤ 0.3 m/s
Tolerances

dynamic (rod)                    h 11   (cylinder)            H11

static (piston)               h 11  (housing)           H 11

 

Item number d D H h
PNN4 • 10N 01 4 10 4 2
PNN5 • 9N 01 5 9 4 2,5
PNN5 • 10N 01 5 10 6 4,1
PNN5 • 12N 01 5 12 5 2,5
PNN5 • 14N 01 5 14 4,5 2,3
PNN6 • 12N 01 6 12 4,3 2
PNN6 • 12N 02 6 12 6 3,8
PNN6 • 16 N 01 6 16 8 5
PNN6 • 16N 02 6 16 6 3,7
PNN6 • 22N 01 6 22 8 5
PNN7 • 14N 01 7 14 3,5 1,75
PNN8 • 14N 01 8 14 4 2
PNN9 • 18N 01 9 18 5 2,5
PNN10 • 15N 01 10 15 3,5 1,7
PNN10 • 18N 01 10 18 4 2
PNN12 • 18N 01 12 18 4 2
PNN14 • 20N 01 14 20 4 2
PNN14 • 30N 01 14 30 8,4 4,4
PNN15 • 25N 01 15 25 5 2,5
PNN16 • 22N 01 16 22 3,5 2
PNN18 • 25N 01 18 25 4 2
PNN19 • 33,3N 01 19 33,3 8 3,2
PNN25 • 35N 01 25 35 8 5
PNN30 • 42N 01 30 42 6 3
PNN32 • 40N 01 32 40 7 5
PNN32 • 56N 01 32 56 12 6
PNN33 • 43N 01 33 43 6 3
PNN35 • 50N 01 35 50 8 4,8
PNN38 • 50N 01 38 50 6 3
PNN44 • 55N 01 44 55 6 3
PNN48 • 60N 01 48 60 6 3
PNN48 • 72N 01 48 72 12 6
PNN50 • 70N 01 50 70 10 5
PNN51 • 63N 01 51 63 6 3
PNN52 • 72N 01 52 72 10 5
PNN60 • 80N 01 60 80 10 5
PNN65 • 80N 01 65 80 7,5 3,7
PNN80 • 100N 01 80 100 10 5
PNN95 • 115N 01 95 115 15 8,5
PNN120 • 140A 01 120 140 10 5
PNN125 • 145N 01 125 145 10 5

Merk

Kaco

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