Kaco Double U-rings PDA

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Kaco Double U-rings are predominantly used as piston seals in pneumatic equipment in the pressure range up to16 bar. In principle, this seal combination consists of two U-rings connected to each other by means of a ridge. The essential advantages consist of the fact that the sealing and guide functions are simultaneously fulfilled by the sealing elements. These double U-rings can be made extremely small; in the radial direction, they hardly require more space than 0-rings. Figure 46 shows a double U-ring PDA.

 

Because of the special shape of double U-rings, during installation, they merely need to be placed over a shoulder on the piston. As the piston has no recesses or undercuts, simple injection tools are required for manufacture, for example, from thermoplastics. It is particularly advantageous that the piston does not come into contact with the cylinder wall. Above all, if plastic or light metal cylinders are used, the formation of marks is more or less prevented (figure 47).

In order to keep the stick and slip frictional force as low as possible, double U-rings PDA has completely molded sealing lips with a rounded sealing edge. The usual cup seal can be replaced by the double U-ring also in the case of single-type pistons. In this case,
the side not subjected to pressure is merely provided with swelling for installation (figures 48 and 49). Such sealing rings have the designation PDC …

Technical data:

Pressure range                                ≤  16 bar

Permissible sliding speed             ≤ 1 m/s
Tolerances

dynamic (cylinder)             H10

static (piston) refer to page 43

 

 

Item number  d D H d1 h h1 R R1
PDA 10 • 16 A 01 10 16 12 13,5 3 4,5 0,9 0,2
PDA 12 • 18 A 01 12 18 12 15,5 3 4,5 0,9 0,2
PDA 13 • 20 A 01 13 20 13 17,5 3 5 1,3 0,2
PDA 14 • 20 A 01 14 20 12 17,5 3 4,5 1,3 0,2
PDA 18 • 25 A 01 18 25 13 22,5 3 5 1,3 0,2
PDA 21,5 • 28,5 A01 21,5 28,5 13 26 3 5 1,3 0,2
PDA 23 • 30 A 01 23 30 13 25,5 3 5 1,3 0,2
PDA 25 • 32 A 01 25 32 13 29,5 3 5 1,3 0,2
PDA 28 • 35 A 01 28 35 13 32,5 3 5 1,3 0,2
PDA 33 • 40 A 01 33 40 13 37,5 3 5 1,3 0,2
PDA 43 • 50 A 01 43 50 13 47,5 3 5 1,3 0,2
PDA 46 • 54 A 01 46 54 15 51,5 4 5,5 1,3 0,2
PDA 50 • 60 A 01 50 60 19 57 5 7 1,6 0,3
PDA 53 • 63 A 01 53 63 19 60 5 7 1,6 0,3
PDA 70 • 80 A 01 70 80 20 77 6 7 1,6 0,3
PDA 73 • 83 A01 73 83 20 80 6 7 1,6 0,3
PDA 88 • 100 A01 88 100 23 96,5 8 7,5 1,6 0,4
PDA 108 • 120 A 01 108 120 23 116,5 8 7,5 1,6 0,4
PDA 113 • 125 A 01 113 125 23 121,5 8 7,5 1,6 0,4
PDA 128 • 140 A 01 128 140 23 136,5 8 7,5 1,6 0,4
PDA 145 • 160 A 01 145 160 29 155,5 10 9,5 1,6 0,4
PDA 185 • 200 A 01 185 200 29 195,5 10 9,5 1,6 0,4

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