Press fitting for pipes having a check ring
A press fitting for pipes includes a socket with an insert opening for a pipe end. An annular groove-shaped space present in a press wall part of a press region is delimited by a limitation edge. A gripping ring is placed in the groove-shaped space. The press region is deformable from a non-compressed state a compressed state by a radially inward directed pressing action causing the press wall part to radially compress and the gripping ring to grip the pipe end. A check ring is provided which has one or more break segments and a coupling part. The break segments can be forced to break free by the pressing action, while the coupling part then comes to lie visible at least partly in between the limitation edge and the pipe end.
1. A press fitting for pipes, comprising:
a socket with an insertion space with an insert opening for having a pipe end inserted therein, the insertion space having a press region which is delimited by a substantially cylindrical press wall part;
an annular groove-shaped space present in the press wall part, which annular groove-shaped space towards the insert opening is delimited by a radially inwardly projecting limitation edge of the press wall part; and
a gripping ring placed in the annular groove-shaped space;
wherein the press region is deformable from a non-compressed state towards a compressed state by a radially inward directed pressing action causing the press wall part to radially compress and the gripping ring to grip an inserted pipe end,
wherein a check ring is provided at the side of the insert opening, which check ring comprises one or more break segments and a coupling part which lies at least partly in between the limitation edge and the inserted pipe end, and
wherein the one or more break segments are connected to the coupling part by means of one or more separation parts such that the one or more break segments are forced to break free along those one or more separation parts from the coupling part by said pressing action, while the coupling part comes to lie visible at least partly in between the limitation edge and the inserted pipe end.
2. The press fitting according to claim 1 , wherein the one or more break segments are formed by one or more segments which at least partly lie alongside at least part of the limitation edge.
3. The press fitting according to claim 1 , wherein the one or more break segments extend at least partly outside the insertion space.
4. The press fitting according to claim 1 , wherein the one or more break segments extend at least partly inside the insertion space.
5. The press fitting according to claim 1 , wherein the one or more break segments have an outer diameter which is equal to or smaller than an outer diameter of the limitation edge and press wall part, and wherein the one or more break segments have an inner diameter which is larger than an outer diameter of an inserted pipe end.
6. The press fitting according to claim 1 , wherein at least the separation parts of the check ring are made out of a brittle material.
7. The press fitting according to claim 1 , wherein the coupling part of the check ring comprises a substantially cylindrical inner guidance wall part for guiding and aligning the pipe end during insertion and pressing action.
8. The press fitting according to claim 1 , wherein the gripping ring comprises a plurality of interspaced grasping teeth, wherein, in the non-compressed state, at least some of the grasping teeth are covered towards the insertion space by the coupling part of the check ring.
9. The press fitting according to claim 8 , wherein the gripping ring comprises an axial inward and outward row of the grasping teeth, wherein the coupling part of the check ring covers only the axially outward row towards the insertion space.
10. The press fitting according to claim 9 , wherein the grasping teeth of the axial inward row are positioned axially slanted inward, whereas the grasping teeth of the axial outward row are positioned axially slanted outward.
11. The press fitting according to claim 1 , wherein the coupling part of the check ring in the non-compressed state couples with the gripping ring.
12. The press fitting according to claim 8 , wherein a space is present between the two rows of grasping teeth, into which space the coupling part of the check ring extends.
13. The press fitting according to claim 1 , wherein the coupling part of the check ring comprises a gap filling part which extends outside the groove shaped space and is designed to, in the compressed state, substantially fill up or substantially shield of a gap between the inserted pipe end and the limitation edge.
14. The press fitting according to claim 13 , wherein the gap filling part is dimensioned to, in the non-compressed state, lie radially interspaced from the limitation edge, and, in the compressed state, lie radially substantially against the limitation edge.
15. The press fitting according to claim 1 , wherein limitation edge is a substantially continuous radially inwardly projecting edge of the press wall part.
16. The press fitting according to claim 1 , further comprising a sealing ring being placed in the annular groove-shaped space.
17. The press fitting according to claim 1 , wherein the one or more break segments comprise an open or closed ring-shaped break segment.
18. An assembly of a press fitting according to claim 1 and a pipe end inserted therein.
19. A method for pressing a press fitting according to claim 1 , comprising the steps of:
inserting a pipe end in the insertion space of the socket; and
deforming the press region from a non-compressed state towards a compressed state by a radially inward directed pressing action causing the press wall part to radially compress and the gripping ring to grip the inserted pipe end,
wherein, the one or more break segments are forced to break free along the one or more separation parts from the coupling part of the check ring by said pressing action, while the coupling part comes to lie visible at least partly in between the limitation edge and the inserted pipe end in said compressed state.
20. The press fitting according to claim 3 , wherein the one or more break segments lie at least partly substantially flat against an axial outer wall of the limitation edge.
21. The press fitting according to claim 4 , wherein the one or more break segments lie at least partly alongside a radial inner wall of the limitation edge.
22. The press fitting according to claim 5 , wherein the inner diameter which is 2.5-5 mm larger than the outer diameter of the inserted pipe end.
23. The press fitting according to claim 6 , wherein at least the separation parts of the check ring are made out of a glass fibre reinforced plastic.
24. The press fitting according to claim 11 , wherein the coupling part of the check ring in the non-compressed state couples with the gripping ring with a snap fit.
25. The press fitting according to claim 14 , wherein the gap filling part is dimensioned to, in the compressed state and while being clamped, lie radially substantially against the limitation edge.
26. The press fitting according to claim 16 , further comprising a spacer ring being placed between the sealing ring and the gripping ring.