BILIP©-H Seal Scraper Elements QHLH

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Kaco BILIP—H seal scraper elements serve the purpose of sealing rods in hydraulic equipment. They have two simultaneous functions — that is to say, sealing and scraping. In comparison with the rod seals with U-rings and scrapers usually used in the past (figure 37), BILIP-H seal scraper elements (figure 38) exhibit the following advantages:

  • These can be replaced from the outer side of the equipment
  • Low space requirements
  • Low friction
  • Long service life

Technical data:

Pressure range                       ≤  200 bar
Permissible sliding speed    ≤ 0.3 m/s
Tolerances

dynamic      (rod)                      H9

static            (housing)              H10

 

The main features of BILIP-H elements are the V-type sealing lip design and the special shape of the Vulcanized metallic support element. The contact surface of the seal on the rod is limited to the necessary minimum for good seal functioning and long service life. Therefore, the frictional forces are lower than those found when a U-ring is used. As a result of the shape and dimension of the metallic insert, in comparison with a
seal with a U-ring, the gap between the rod and housing no longer plays any role. Therefore, it is possible to support the rear of the BILI P-H seal scraper element in its location hole in the housing by means of a round wire circlip (German standard DIN 7993, type B). Regarding the necessary pressing-in tools please contact our engineering department.

 

The maximum tension force of the V-type sealing lip is directly in the area of the sealing edge (refer to the description on page 4, figure 3). Asa result of this, the formation of a liquid wedge is more or less suppressed and a maximum amount of sealing is achieved. In order to protect the rubber scraper of the BILIP element in extreme conditions, an additional QY metal scraper can be provided (refer to the table of dimensions on page 35). This is also held by means of a round-wire circlip. The space between the metal scraper and the BILIP element is filled with grease.

During the installation of BILIP-H seal scraper elements, ensure that the rubber cam of the sealing ring, which is provided to prevent displacement, lies between the ends of the round-wire circlip. In this case, the arc-shaped dismantling groove which runs in an axial direction can serve as an orientation aid (figure 39).

 

 

In order to remove the BILIP-H sealing ring, the round wire circlip must be turned in a circumferential direction with the aid of a screwdriver until the dismantling groove is completely covered (illustration on the top right-hand corner of page 35). The dismantling groove is provided to aid removal by means of a screwdriver from the retaining groove of the round wire circlip (figure 42). The BILIP-H sealing ring is removed by means of slight pressure action or by removing the piston rod.

Item number BILIP element d D H d1 e R f R1 Item numbers of metal scrapers  d2 g
QHLH 8.18 VGUO1 8 18 9,2 19,6 0,9 0,9 1,5 4 QY 8.18 19,6 4,5
QHLH 10.20 VGUO1 10 20 9,4 22 1,1 1,1 1,8 4 QY 10.20 21,6 4,7
QHLH 12.22 VGUO1 12 22 9,4 24 1,1 1,1 1,8 4 QY 12.22 23,6 4,7
QHLH 14.24 VGUO1 14 24 9,4 26 1,1 1,1 1,8 4 QY 14.24 25,6 4,7
QHLH 16.26 VGUO1 16 26 9,4 28 1,1 1,1 1,8 5 QY 16.26 27,6 4,7
QHLH 18.28 VGUO1 18 28 9,4 30 1,1 1,1 1,8 5 QY 18.28 29,6 4,7
QHLH 20.30 VGUO1 20 30 9,4 32 1,1 1,1 1,8 5 QY 20.30 31,6 4,7
QHLH 22.32 VGUO1 22 32 9,7 34,5 1,4 1,4 2 7,5 QY 22.32 33,6 5
QHLH 25.35 VGUO1 25 35 9,7 37,5 1,4 1,4 2 7,5 QY 25.35 36,6 5
QHLH 28.38 VGUO1 28 38 9,7 40,5 1,4 1,4 2 7,5 QY 28.38 39,6 5
QHLH 30-40 VGUO1 30 40 9,7 42,5 1,4 1,4 2 7,5 QY 30.40 41,6 5
QHLH 32.42 VGUO1 32 42 9,7 44,5 1,4 1,4 2 7,5 QY 32.42 43,6 5
QHLH 36.46 VGUO1 36 46 9,7 48,5 1,4 1,4 2 7,5 QY 36.46 47,6 5
QHLH 40.50 VGUO1 40 50 9,7 52,5 1,4 1,4 2 7,5 QY 40.50 51,6 5
QHLH 45.55 VGUO1 45 55 10,3 58,2 1,8 1,8 2,5 10 QY 45.55 56,6 5,4
QHLH 50.60 VGUO1 50 60 10,3 63,2 1,8 1,8 2,5 10 QY 50.60 61,6 5,4

 

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