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1. (WO2019032894) PISTON SEAL WITH SOLID LUBRICANT APPLICATOR
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What is Claimed is:

1. A sealing ringset configured to seal against a bore of a cylinder without liquid lubricant, the sealing ringset comprising:

at least one sealing ring comprising metal configured to be arranged on a piston to seal against the bore; and

an applicator comprising a solid lubricant configured to be arranged on the piston and to provide lubrication between the at least one sealing ring and the bore.

2. The sealing ringset of claim 1, wherein the at least one sealing ring and the applicator are configured to be arranged together in a circumferential groove of the piston.

3. The sealing ringset of claim 1, wherein the at least one sealing ring and the applicator are configured to be arranged in respective circumferential grooves of the piston.

4. The sealing ringset of claim 1, wherein the at least one sealing ring is axially rearward of the applicator.

5. The sealing ringset of claim 1, wherein the at least one sealing ring is axially forward of the applicator .

6. The sealing ringset of claim 1, wherein the applicator is not configured to act as a seal.

7. The sealing ringset of claim 1, wherein the applicator comprises an oxidation inhibitor.

8. The sealing ringset of claim 1, wherein the applicator is configured to provide the lubrication between the at least one sealing ring and the bore by depositing a layer of the solid lubricant on the bore.

9. The sealing ringset of claim 1, further comprising a spring arranged radially inwards of the applicator and configured to apply a radially outward force on the applicator.

10. The sealing ringset of claim 1, wherein the at least one sealing ring comprises a first sealing ring, the sealing ringset further comprising a second sealing ring comprising a solid lubricant that is configured to prevent the first sealing ring from contacting the circumferential groove.

11. A piston assembly comprising:

a piston comprising at least one circumferential groove; and

a sealing ringset comprising:

at least one sealing ring comprising metal configured to be arranged in the at least one circumferential groove and configured to seal against a bore without liquid lubricant, and

an applicator comprising a solid lubricant configured to be arranged in the at least one circumferential groove and configured to provide lubrication between the at least one sealing ring and the bore.

12. The piston assembly of claim 11, wherein the at least one circumferential groove consists of a single groove, and wherein the at least one sealing ring and the applicator are configured to be arranged together in the single groove.

13. The piston assembly of claim 11, wherein the at least one circumferential groove comprises at least two grooves, and wherein the at least one sealing ring and the applicator are configured to be arranged in respective circumferential grooves of the piston.

14. The piston assembly of claim 11, wherein the at least one sealing ring is axially rearward of the applicator.

15. The piston assembly of claim 11, wherein the at least one sealing ring is axially forward of the applicator .

16. The piston assembly of claim 11, wherein the applicator is not configured to act as a seal.

17. The sealing ringset of claim 1, wherein the applicator comprises an oxidation inhibitor.

18. The piston assembly of claim 11, wherein the applicator is configured to provide the lubrication between the at least one sealing ring and the bore by depositing a layer of the solid lubricant on the bore.

19. The piston assembly of claim 11, wherein the sealing ringset further comprises a spring arranged radially inwards of the applicator and configured to apply a radially outward force on the applicator.

20. The piston assembly of claim 11, wherein the at least one sealing ring comprises a first sealing ring, the sealing ringset further comprising a second sealing ring comprising a solid lubricant that is configured to prevent the first sealing ring from contacting the circumferential groove.

21. A device comprising:

a cylinder comprising a bore;

a piston comprising at least one circumferential groove and configured to move axially within the bore; and

a sealing ringset comprising:

at least one sealing ring comprising metal configured to be arranged in the at least one circumferential groove and configured to seal against the bore without liquid lubricant, and

an applicator comprising a solid lubricant configured to be arranged in the at least one circumferential groove and configured to provide lubrication between the at least one sealing ring and the bore.

22. The device of claim 21, wherein the at least one circumferential groove consists of a single groove, and wherein the at least one sealing ring and the applicator are configured to be arranged together in the single groove.

23. The device of claim 21, wherein at least one circumferential groove comprises at least two grooves, and wherein the at least one sealing ring and the applicator are configured to be arranged in respective circumferential grooves of the piston.

24. The device of claim 21, wherein the at least one sealing ring is axially rearward of the applicator .

25. The device of claim 21, wherein the at least one sealing ring is axially forward of the applicator .

26. The device of claim 21, wherein the applicator is not configured to act as a seal.

27. The device of claim 1, wherein the applicator comprises an oxidation inhibitor.

28. The device of claim 21, wherein the applicator is configured to provide the lubrication between the at least one sealing ring and the bore by depositing a layer of the solid lubricant on the bore.

29. The device of claim 21, wherein the sealing ringset further comprises a spring arranged radially inwards of the applicator and configured to apply a radially outward force on the applicator.

30. The device of claim 21, wherein the at least one sealing ring comprises a first sealing ring, the sealing ringset further comprising a second sealing ring comprising a solid lubricant that is configured to prevent the first sealing ring from contacting the circumferential groove.