Valve self-piercing tap
AssigneeGeorg Fischer Rohrleitungssysteme AG
InventorLars Bunger
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Abstract
The invention relates to a valve self-piercing tap for a plastic tube with a plastic housing (1) which has a branch connection member (2) and holds a valve body (3), in which a blocking body (5) engaged with a threaded spindle (6) and carrying a punch ring (9) for forming an opening in the plastic tube is displaceably arranged to be moved into axial engagement with a valve seat (10) to block access to the branch connection member (2). To avoid sealing rings, the valve body has at least one circumferential groove (12) with a side (13) directed towards the outlet (11). The housing is injection-molded around the valve body.
Claims7
A valve self-piercing tap for use on plastic piping, said tap comprising:
- a valve body, said valve body extending substantially axially and having a valve seat located near an axial end of said valve body, said valve body further having at least one circumferential groove extending around an outer surface of said valve body, said groove having at least one leg directed both radially inwardly toward an inner surface of said valve body and axially toward said valve seat;
- and
- a housing being formed from plastic and having an inlet opening located on an end of said housing corresponding to said valve seat, said plastic being injection molded onto said outer surface of said valve body, said plastic filling said circumferential groove of said valve body, said plastic within said circumferential groove forming a seal which self adjusts as pressure acts to separate said housing and said valve body.
Dependencies are inferred from the claim text.