Pipe fitting

Abstract

A compression pipe fitting is provided. The fitting comprises a body defining one or more sockets for receiving an end of a pipe, a clamping nut and a grip ring. The socket is encircled by a threaded face, and is internally adapted to receive a compressible O-ring. The nut can be screwed onto the threaded face of the socket and has an internal tapered surface while the grip ring has a complimentally tapered surface which, when the nut is tightened onto the threaded face, bears upon the grip ring compressing it against the pipe and compressing the o-ring located within the socket.

1 . A push-fit compression pipe fitting comprising a body defining one or more sockets for receiving an end of a pipe, the socket being encircled by a threaded face; a clamping nut which can be screwed onto the threaded face, and a grip ring, wherein the socket is internally adapted to receive a compressible O-ring; the nut has an internal tapered surface and the grip ring has a complementally tapered surface which, when the nut is tightened onto the threaded face, bears upon the grip ring compressing the grip ring against the pipe and compressing the O-ring located within the socket against the pipe. 
     
     
         2 . A push-fit compression pipe fitting as claimed in  claim 1 , wherein the socket includes a circumferential recess about the mouth thereof which acts as an O-ring seat; and a rear shoulder or flange or step. 
     
     
         3 . A push-fit compression pipe fitting as claimed  claim 1 , wherein the grip ring comprises a split ring which has an internal diameter which is slightly smaller than the external diameter of the inserted pipe, which results in the grip ring expanding slightly when the pipe is inserted therethrough. 
     
     
         4 . A push-fit compression pipe fitting as claimed in  claim 1 , wherein the grip ring includes a plurality of small teeth spaced apart about the internal or pipe engaging surface thereof. 
     
     
         5 . A push-fit compression pipe fitting as claimed in  claim 1 , wherein the grip ring comprises a stainless steel split ring embedded within a plastic composite material. 
     
     
         6 . A push-fit compression pipe fitting as claimed in  claim 5 , wherein the stainless steel ring includes about its internal diameter, one or more teeth angled inwardly and in the direction of the fitting body when the fitting is assembled. 
     
     
         7 . A push-fit compression pipe fitting as claimed in  claim 1 , wherein the underside of the grip ring is dimensioned to engage the mouth of the socket. 
     
     
         8 . A push-fit compression pipe fitting as claimed in  claim 7 , wherein the underside of the grip ring includes a ridge or the like protruding formation defining a stepped surface adapted to engage the O-ring. 
     
     
         9 . A push-fit compression pipe fitting as claimed in  claim 1 , wherein a flat washer is provided between the O-ring and the grip ring. 
     
     
         10 . A push-fit compression pipe fitting as claimed in  claim 9 , wherein the ridge is spaced apart from the external diameter of the grip ring to fit within the O-ring seat and linearly compress the washer and O-ring, against the O-ring seat, causing the O-ring to be deformed and in so doing tightly engaging the inserted pipe end. 
     
     
         11 . A push-fit compression pipe fitting as claimed in  claim 7 , wherein an O-ring having a greater cross sectional diameter is used, replacing the need for the ridge.