Kaco U-rings Rod Seals With Adhesive Component PNI

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For sealing piston rods, these special U-rings are available for the relatively small installation spaces found in the fields of pneumatics and hydraulics up to100 bar.

Kaco PNI type U-rings distinguish themselves from the standard type U-rings by their unevenly long sealing lips. The external, static sealing lip is longer and often has a larger cross-section in order to guarantee support in the axial direction without impairment of functioning. Therefore, special support rings or similar supports are not necessary.

During installation, PNI U-rings can be snapped by hand into a location groove which can be manufactured easily and cheaply. In order to guarantee good functioning, it is necessary that the U-ring still has an axial clearance of 0.5 to 0.8 mm when installed.

Regarding sealing function, frictional force, and service life, the dynamic sealing lip has an optimum design. Sharp sealing edges are used for sealing liquid media.  Rounded sealing edges, which require no mechanical after treatment after pressing, are predominantly used in aeriform and gaseous media. Because of the pressing skin on the contact surface, especially in the case of lacking lubrication, this version is more resistant to wear and tear and has a longer service life.

The various lip shapes are found as follows in the
designations of the U-rings:

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

Technical data:
Pressure range

hydraulics                                ≤ 100 bar

pneumatics                              ≤ 16 bar
Permissible sliding speed

hydraulics                                ≤  0.3 m/s

pneumatics                              ≤ 1 m/s
Tolerances

dynamic (rod)                      H11

static (housing)                    H11

 

One advantage of PNI U-rings for application consists of the fact that, during installation, they are compressed by a certain, predetermined dimension. Asa result of this, the relatively large manufacturing tolerances, especially in the case of rod diameters of more than

40 mm, referred to the diameter, can be ignored and the considerably smaller tolerances, referred to the sealing ring cross-section, can be applied during manufacture. In addition, as a result of the smaller tolerances, jamming on the dynamic lip side is also
avoided and it is possible to narrow down the frictional force range.

 

 

Item number  d D H h
PNI7 • 11N 01 7 11 4,5 2,3
PNI7 • 13N 01 7 13 4 1,8
PNI8 • 14,5N 01 8 14,5 4 2
PNI10 • 16A 01 10 16 4,5 2,3
PNI10 • 22N 01 10 22 9 4,5
PNI11 • 17N01 11 17 5 2,5
PNI12 • 19N 01 12 19 6 2,8
PNI14 • 20N 01 14 20 5,5 2,5
PNI16 • 26N 01 16 26 7 3,5
PM18 • 25N01 18 25 6 2,8
PNI18 • 30A 01 18 30 6 3
PNI20 • 26N 01 20 26 5 2,3
PNI20 • 28N 01 20 28 5,5 2,3
PNI20 • 28N 02 20 28 6 3
PNI20 • 29,1 N 01 20 29,1 7 3,8
PNI20,2 • 33,8 N 01 20,2 33,8 8 3
PNI22 • 30N 01 22 30 7 3,9
PNI22 • 30N 02 22 30 6 3
PNI25 • 33N 01 25 33 10 6
PNI30 • 38N 01 30 38 7 3,9
PNI40 • 50N 01 40 50 9 4
PNI40 • 56N 01 40 56 10 4
PNI50 • 62N 01 50 62 10,5 5,1
PNI80 • 93N 01 80 93 8 4

Merk

Kaco

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