K609

K609 : Buffer Seals

 

Material

Material

Polyurethane HPU82 shore  + back up Poly acetal  anti-extrusion

Polyurethane HPU95A + back up Poly acetal  anti-extrusion

Introduction

K609 is a rod buffer seal. It provides the designer with a compact low friction seal for light to medium duty hydraulic cylinders.

 This compact rod/gland seal provides optimum sealing performance combined with smooth operation and low levels of breakout and dynamic friction.

 It is designed to provide a action valve to prevent excessive pressure build up in the cavity between buffer seals and the rod seal. It used to act as a  buffer seal for the primary rod sea. K609 profile  provides the majority of the rod sealing performance  while allowing  fluid to the by pass and energize the primary rod seal. Fluid located between The K609 profile    and rod seal will relieve back into the cylinder by flowing  past.

 It has a special combined Polyurethane HPU82 shore  with Polyacetal  anti-extrusion The U - Cup is designed to have a contact area with the rod adequate to retain the media at low pressure. As high pressure acts on the O ring it compresses the lip against the rod increasing the contact area and the effectiveness of the seal.

 Energizer

Standard material: Polyurethane HPU82

Special materials: other elastomers to suit operating conditions, including fluoroelastomer (FKM) for high

temperature duties.

 

Back up

Standard material: Polyacetal  anti-extrusion.

Special materials: PTFE + 46% bronze.

     Ø  High performance single-acting seal providing low wear and maintenance.

Ø  Low dynamic and breakout friction for instant response, smooth operation and reduced power consumption.

Ø  Rectangular energizer stabilizes sealing element during operation giving optimum fluid retention and seal life.

 

Typical applications

 Systems where instant response and low power consumption are important and leakage is unacceptable.

 Examples include: hydraulic cylinders, mobile hydraulics, injection moulding machines, and down stroking presses.

 Standard seals are supplied with a nitrile O ring but other materials can be provided.

 This pressure relief feature allows the K609 profile to be used in tandem or multiple seal arrangements. The K609 features low friction, long life, and versatility.The compression force is spread out over a larger area allowing trapped fluid to pass under the seal and return to the system.

 The  K609 profile is a rod seal that can be used as a buffer seal in conjunction with a primary rod seal or in tandem with itself to form a sealing system for higher performance. The K609 profile is a unidirectional seal, with a unique design that allows trapped fluid pressure back into the cylinder. When the rod extends from the cylinder the K609 profile is riding on a sealing point, creating a high compression point to limit leakage. As the rod goes through its return stroke this seal rocks forward, creating a larger sealing surface on the rod.

  

 

Material

Power-transmission fluid

Temperature C

Speed

Pressure

Max. Gap F

 

PU + POM Acetal

Mineral Oil (NBR)

-30  -  +110

≤   15m/s

160 bar

F  ≤   0,6 mm

Mineral Oil (FKM)

-30  -  +220

 

250 bar

F  ≤   0,4 mm

 

 

 

 

 

 

400 bar

F  ≤   0,3 mm

 

Chamfers & Rad

Tolerance

Surface Finishing

(mm)

µm Ra

µm Rt

S  ≤

3.75

5.5

7.5

10.5

12.5

15

ø d

f8 / h9

0,1-0,4

≤  4

C  ≥

2

3

5

7.5

8

8.5

ø D

H9

≤  1,6

≤ 10

r1  ≤

0.4

0.8

1.2

1.6

1.6

2.0

L

+0,2      -0

≤  3,2

≤ 16

 

Dimension

 

 

Model

d

Tolerance

f8/h9

D

Tolerance
H9

H

L +0.2
  0

K609

4

-0.010

-0.028

8.9

+0.036

+0.00

2

2.2

K609

5

-0.010

-0.028

9.9

+0.036

+0.00

2

2.2

K609

6

-0.013

-0.035

10.9

+0.043

+0.00

2

2.2

K609

7

-0.013

-0.035

11.9

+0.043

+0.00

2

2.2

K609

8

-0.013

-0.035

12.9

+0.043

+0.00

2

2.2

K609

8

-0.013

-0.035

15.3

+0.043

+0.00

2.9

3.2

K609

10

-0.016

-0.043

14.9

+0.043

+0.00

2

2.2

K609

10

-0.016

-0.043

17.3

+0.043

+0.00

2.9

3.2

K609

12

-0.016

-0.043

16.9

+0.043

+0.00

2

2.2

K609

12

-0.016

-0.043

19.3

+0.052

+0.00

2.9

3.2

K609

14

-0.016

-0.043

18.9

+0.052

+0.00

2

2.2

K609

14

-0.016

-0.043

21.3

+0.052

+0.00

2.9

3.2

K609

15

-0.016

-0.043

19.9

+0.052

+0.00

2

2.2

K609

15

-0.016

-0.043

22.3

+0.052

+0.00

2.9

3.2

K609

16

-0.016

-0.043

20.9

+0.052

+0.00

2

2.2

K609

16

-0.016

-0.043

23.3

+0.052

+0.00

2.9

3.2

K609

18

-0.020

-0.053

22.9

+0.052

+0.00

2

2.2

K609

18

-0.020

-0.053

25.3

+0.052

+0.00

2.9

3.2

K609

20

-0.020

-0.053

27.3

+0.052

+0.00

2.9

3.2

K609

20

-0.020

-0.053

30.7

+0.062

+0.00

3.9

4.2

K609

22

-0.020

-0.053

29.3

+0.052

+0.00

2.9

3.2

K609

22

-0.020

-0.053

32.7

+0.062

+0.00

3.9

4.2

K609

22.4

-0.020

-0.053

29.7

+0.052

+0.00

2.9

3.2

K609

22.4

-0.020

-0.053

33.1

+0.062

+0.00

3.9

4.2

K609

25

-0.020

-0.053

32.3

+0.062

+0.00

2.9

3.2

K609

25

-0.020

-0.053

35.7

+0.062

+0.00

3.9

4.2

K609

28

-0.020

-0.053

35.3

+0.062

+0.00

2.9

3.2

K609

28

-0.020

-0.053

38.7

+0.062

+0.00

3.9

4.2

K609

30

-0.025

-0.064

37.3

+0.062

+0.00

2.9

3.2

K609

30

-0.025

-0.064

40.7

+0.062

+0.00

3.9

4.2

K609

32

-0.025

-0.064

39.3

+0.062

+0.00

2.9

3.2

K609

32

-0.025

-0.064

42.7

+0.062

+0.00

3.9

4.2

K609

35

-0.025

-0.064

42.3

+0.062

+0.00

2.9

3.2

K609

35

-0.025

-0.064

45.7

+0.062

+0.00

3.9

4.2

K609

35.5

-0.025

-0.064

42.8

+0.062

+0.00

2.9

3.2

K609

35.5

-0.025

-0.064

46.2

+0.062

+0.00

3.9

4.2

K609

36

-0.025

-0.064

43.3

+0.062

+0.00

2.9

3.2

K609

36

-0.025

-0.064

46.7

+0.062

+0.00

3.9

4.2

K609

38

-0.025

-0.064

48.7

+0.062

+0.00

3.9

4.2

K609

38

-0.025

-0.064

53.1

+0.074

+0.00

5.9

6.3

K609

40

-0.025

-0.064

50.7

+0.074

+0.00

3.9

4.2

K609

40

-0.025

-0.064

55.1

+0.074

+0.00

5.9

6.3

K609

42

-0.025

-0.064

52.7

+0.074

+0.00

3.9

4.2

K609

42

-0.025

-0.064

57.1

+0.074

+0.00

5.9

6.3

K609

45

-0.025

-0.064

55.7

+0.074

+0.00

3.9

4.2

K609

45

-0.025

-0.064

60.1

+0.074

+0.00

5.9

6.3

K609

50

-0.030

-0.076

60.7

+0.074

+0.00

3.9

4.2

K609

50

-0.030

-0.076

65.1

+0.074

+0.00

5.9

6.3

K609

56

-0.030

-0.076

66.7

+0.074

+0.00

3.9

4.2

K609

56

-0.030

-0.076

71.1

+0.074

+0.00

5.9

6.3

K609

60

-0.030

-0.076

70.7

+0.074

+0.00

3.9

4.2

K609

60

-0.030

-0.076

75.1

+0.074

+0.00

5.9

6.3

K609

63

-0.030

-0.076

78.1

+0.074

+0.00

5.9

6.3

K609

65

-0.030

-0.076

80.1

+0.087

+0.00

5.9

6.3

K609

67

-0.030

-0.076

82.1

+0.087

+0.00

5.9

6.3

K609

70

-0.030

-0.076

85.1

+0.087

+0.00

5.9

6.3

K609

71

-0.030

-0.076

86.1

+0.087

+0.00

5.9

6.3

K609

75

-0.030

-0.076

90.1

+0.087

+0.00

5.9

6.3

K609

80

-0.036

-0.090

95.1

+0.087

+0.00

5.9

6.3

K609

85

-0.036

-0.090

100.1

+0.087

+0.00

5.9

6.3

K609

90

-0.036

-0.090

105.1

+0.087

+0.00

5.9

6.3

K609

95

-0.036

-0.090

110.1

+0.087

+0.00

5.9

6.3

K609

100

-0.036

-0.090

115.1

+0.087

+0.00

5.9

6.3

K609

105

-0.036

-0.090

120.1

+0.100

+0.00

5.9

6.3

K609

110

-0.036

-0.090

125.1

+0.100

+0.00

5.9

6.3

K609

112

-0.036