K840

Material

Material

Code

NBR + PTFE Bronze compound

K840B , K840G

NBR + PTFE

 

FKM (Viton) + PTFE

 

NBR + PTFE + Graphite + Glass

 

 Introduction

K840 is an O-ring energized double lip wiper, which is designed to exclude dirt from entering the

cylinder and to collect traces of fluid passing the rod seal.

 K840 combines low friction double lip PTFE ring and rubber o-ring energizer to perform a high speed, efficiency and stable dust wiper.

 The K840 is a double acting wiper for use in low to medium duty hydraulic cylinders. It is a two piece design comprised of a filled PTFE cap that is energized by a standard size O-ring.

 The wiper and seal design of the K840 profile assists the primary rod seal in preventing leakage by helping seal fluid in the cylinder when the rod extends. When the cylinder rod retracts, the outside sealing edge prevents contamination from entering the system. K840 profile will retrofit non-Parker wipers of similar design.

 It has a special filled PTFE ring with a pre-loaded lip energized by an O ring. The lip 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: medium nitrile (NBR) elastomer.

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

temperature duties.

 PTFE sleeve

Standard material: bronze loaded PTFE.

Special materials: alternative grades of PTFE to suit specific applications.

 The special PTFE ring has the low frictional properties normally associated with this material but is strengthened by additives to reduce creep. It has a low breakout friction so stick-slip is eliminated.

Special features

 

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  Protects primary seal from contamination

Ø  Extends seal life

Ø  Low friction no stick-slip

Ø  High strength machined PTFE wiper

Ø  Wide range of other materials and dimensions available for special applications 

 

Operating Conditions

Tolerance

Chamfers & Rad (mm)

Material

 

PTFE

 

ø d1

f9

S  ≤

3.75

5.5

7.5

10.5

12.5

NBR

Temperature

 

VITON

ø D1

H11

C  ≥

2

3

5

7.5

8

 

O-ring

 

O-ring

ø D2

H11

r1  ≤

0.4

0.8

1.2

1.6

1.6

-30C     +110C

-30C     +200C

L1

+0,2     -0

 

 

 

 

 

 

Speed

 

15m/s

 

 

 

 

 

 

 

 

 

 

ø d1

ø D1

ø D2

L1

L2

 

ø d1

ø D1

ø D2

L1

L2

6

10.8

3.7

2

7.5

 

260

272.2

8.4

4

262

8

12.8

3.7

2

9.5

 

260

276

9.5

5

262.5

10

14.8

3.7

2

11.5

 

270

282.2

8.4

4

272

12

18.8

5

2

13.5

 

270

286

9.5

5

272.5

14

20.8

5

2

15.5

 

280

292.2

8.4

4

282

15

21.8

5

2

16.5

 

280

296

9.5

5

282.5

16

20.8

3.7

2

17.5

 

290

302.2

8.4

4

292

16

22.8

5

2

17.5

 

290

306

9.5

5

292.5

18

22.8

3.7

2

19.5

 

300

312.2

8.4

4

302

18

24.8

5

2

19.5

 

300

316

9.5

5

302.5

20

26.8

5

2

21.5

 

310

322.2

8.4

4

312

20

27.6

4.2

3

21.5

 

310

326

9.5

5

312.5

22

28.8

5

2

23.5

 

320

332.2

8.4

4

322

22

29.6

4.2

3

23.5

 

320

336

9.5

5

322.5

24

31.6

4.2

3

25.5

 

330

342.2

8.4

4

332

25

31.8

5

2

26.5

 

330

346

9.5

5

332.5

25

32.6

4.2

3

26.5

 

340

352.2

8.4

4

342

25.4

33

4.2

3

26.9

 

340

356

9.5

5

342.5

28

35.6

4.2

3

29.5

 

350

362.2

8.4

4

352

30

34.8

3.7

2

31.5

 

350

366

9.5

5

352.5

30

36.8

5

2

31.5

 

360

372.2

8.4

4

362

30

37.6

4.2

3

31.5

 

360

376

9.5

5

362.5

32

38.8

5

2

33.5

 

370

382.2

8.4

4

372

32

39.6

4.2

3

33.5

 

370

386

9.5

5

372.5

35

41.8

5

2

36.5

 

380

392.2

8.4

4

382

35

42.6

4.2

3

36.5

 

380

396

9.5

5

382.5

36

42.8

5

2

37.5

 

390

402.2

8.4

4

392

36

43.6

4.2

3

37.5

 

390

406

9.5

5

392.5

37

43.8

5

2

38.5

 

400

412.2

8.4

4

402

37

44.6

4.2

3

38.5

 

400

424

14

8

402.5

38

45.6

4.2

3

39.5

 

410

434

14

8

412.5

40

46.8

5

2

41.5

 

420

444

14

8

422.5

40

48.8

6.3

3

41.5

 

430

454

14

8

432.5

42

48.8

5

2

43.5

 

440

456

11

4

442

42

50.8

6.3

3

43.5

 

440

464

14

8

442.5

45

51.8

5

2

46.5

 

450

466

11

4

452

45

53.8

6.3

3

46.5

 

450

474

14

8

452.5

46

54.8

6.3

3

47.5

 

460

476

11

4

462

48

56.8

6.3

3

49.5

 

460

484

14

8

462.5

49

55.8

5

2

50.5

 

470

486

11

4

472

50

56.8

5

2

51.5

 

470

494

14

8

472.5

50

58.8

6.3

3

51.5

 

480

496

11

4

482

50.8

57.6

5

2

52.3

 

480

504

14

8

482.5

50.8

59.6

6.3

3

52.3

 

490

506

11

4

492

54

60.8

5

2

55.5

 

490

514

14

8

492.5

55

61.8

5

2

56.5

 

500

516

11

4

502

55

63.8

6.3

3

56.5

 

500

524

14

8

502.5

56

62.8

5

2

57.5

 

510

526

11

4

512

56

64.8

6.3

3

57.5

 

510

534

14

8

512.5

60

66.8

5

2

61.5

 

520

536

11

4

522

60

68.8

6.3

3

61.5

 

520

544

14

8

522.5

63

69.8

5

2

64.5

 

530

546

11

4

532

63

71.8

6.3

3

64.5

 

530

554

14

8

532.5

63.5

72.3

6.3

3

65

 

540

556

11

4

542

65

73.8

6

3

66.5

 

540

564

14

8

542.5

65

73.8

6.3

3

66.5

 

550

566

11

4

552

70

78.8

6

3

71.5

 

550

574

14

8

552.5

70

82.2

8.1

4

72

 

560

576

11

4

562

75

83.8

6

3

76.5

 

560

584

14

8

562.5

75

87.2

8.1

4

77

 

570

586

11

4

572

80

92.2

8.1

4

82

 

570

594

14

8

572.5

85

93.8

6

3

86.5

 

580

596

11

4

582

85

97.2

8.1

4

87

 

580

604

14

8

582.5

88

88.8

6

3

81.5

 

590

606

11

4

592

90

98.8

6

3

91.5

 

590

614

14

8

592.5

90

102.2

8.1

4

92

 

600

616

11

4

602

95

103.8

6

3

96.5

 

600

624

14

8

602.5

95

107.2

8.1

4

97

 

610

626

11

4

612

100

108.8

6

3

101.5

 

610

634

14

8

612.5

100

112.2

8.1

4

102

 

620

636

11

4

622

101.6

113.8

8.1

4

103.6

 

620

644

14

8

622.5

105

113.8

6

3

106.5

 

630

646

14

4

632

105

117.2

8.1

4

107

 

630

654

14

8

632.5

110

118.8

6

3

111.5

 

640

664

14

8

642.5

110

122.2

8.1

4

112

 

650

682

16

10

652.5

115

123.8

6

3

116.5

 

660

692

16

10

662.5

115

127.2

8.1

4

117

 

670

702

16

10

672.5

120

128.8

6

3

121.5

 

680

700

14

5

682.5

120

132.2

8.1

4

122

 

680

712

16

10

682.5

125

133.8

6

3

126.5

 

690

722

16

10

692.5

125

137.2

8.1

4

127

 

700

720

14

5

702.5

127

139.2

8.1

4

129

 

700

732

16

10

702.5

130

138.8

6

3

131.5

 

710

742

16

10

712.5

130

142.2

8.1

4

132

 

720

752

16

10

722.5

135

143.8

6

3

136.5

 

730

762

16

10

732.5

135

147.2

8.1

4

137

 

740

772

16

10

742.5

137

145.8

6

3

138.5

 

750

782

16

10

752.5

140

148.8

6

3

141.5

 

760

792

16

10

762.5

140

156

9.5

5

142.5

 

770

790

14

5

772.5

145

153.8

6

3

146.5

 

770

802

16

10

772.5

150

158.8

6

3

151.5

 

780

812

16

10

782.5

150

166

9.5

5

152.5

 

790

822

16

10

792.5

160

168.8

6

3

161.5

 

800

832

16

10

802.5

160

176

9.5

5

162.5

 

810

842

16

10

812.5

170

178.8

6

3

171.5

 

820

852

16

10

822.5

170

186

9.5

5

172.5

 

828

848

14

5

830.5

180

188.8

6

3

181.5

 

830

862

16

10

832.5

180

196

9.5

5

182.5

 

840

872

16

10

842.5

190

198.8

6

3

191.5

 

850

882

16

10

852.5

200

208.8

6

3

201.5

 

860

892

16

10

862.5

200

216

9.5

5

202.5

 

870

902

16

10

872.5

210

218.8

6

3

211.5

 

880

900

14

5

882.5

210

226

9.5

5

212.5

 

880

912

16

10

882.5

220

228.8

6

3

221.5

 

890

922

16

10

892.5

220

236

9.5

5

222.5

 

900

920

14

5

902.5

230

238.8

6

3

231.5

 

900

932

16

10

902.5

230

246

9.5

5

232.5

 

910

942

16

10

912.5

230

245.5

6

3

232.5

 

920

952

16

10

922.5

240

248.8

6

3

241.5

 

930

962

16

10

932.5

240

256

9.5

5

242.5

 

940

972

16

10

942.5

250

258.8

6

3

251.5

 

950

982

16

10

952.5

250

266

9.5

5

252.5