Compression pipe fitting with wide range grip rings

A compression fitting, for connecting a selected one of pipes having a range of outer diameters between a maximum diameter and a minimum diameter, comprising:

• a support body substantially tubular around an axis and having a main body section and at least one end section,
• said main body section having an inner surface defining a fluid passage, said one end section having
• a first inner surface having a first diameter substantially equal to said maximum diameter, and
• an end face remote from said main body section, and
• a transition surface between said main body section inner surface and said support body end section inner surface;
• a gasket adapted to fit over said selected pipe and engage said support body end section end face;
• a grip ring encircling said selected pipe with said gasket between said grip ring and said one support body end section end face;
• and
• a fitting nut encircling said grip ring and said gasket, said fitting nut having a tapered inner surface whereby axial movement of said fitting nut toward said support body main body section directly engages said grip ring to bias said grip ring radially inwardly against said selected pipe in a compression position in which said grip ring secures said selected pipe in said support body,
• said grip ring retains said gasket inside said fitting nut between said grip ring and said one support body end section end face, and
• wherein said support body end section end face is tapered outwardly from the support body end section inner surface to the end section outer surface, said end face being substantially conical along and around the axis.

A compression fitting, for connecting a selected one of pipes having a range of outer diameters between a maximum diameter and a minimum diameter, comprising:

• a support body substantially tubular around an axis and having a main body section and at least one end section,
• said main body section having an inner surface defining a fluid passage, said one end section having
• a first inner surface having a first diameter substantially equal to said maximum diameter, and
• an end face remote from said main body section, and
• a transition surface between said main body section inner surface and said support body end section inner surface;
• a gasket adapted to fit over said selected pipe and engage said support body end section end face;
• a grip ring encircling said selected pipe with said gasket between said grip ring and said one support body end section end face;
• and
• a fitting nut encircling said grip ring and said gasket, said fitting nut having a tapered inner surface whereby axial movement of said fitting nut toward said support body main body section directly engages said grip ring to bias said grip ring radially inwardly against said selected pipe in a compression position in which said grip ring secures said selected pipe in said support body,
• said grip ring retains said gasket inside said fitting nut between said grip ring and said one support body end section end face, and
• wherein said fitting nut tapered surface is at an axial end of said fitting nut and is tapered to a reduced inner diameter around said selected pipe, and said grip ring has a sloped surface engaging said fitting nut tapered surface whereby axial movement of said fitting nut when threaded onto said end section threaded outer surface biases said grip ring radially inwardly toward said selected pipe.

A compression fitting for connecting a first pipe to a second pipe, said first pipe having an outer first diameter and said second pipe having an outer second diameter, said first diameter being equal to or greater than said second diameter, comprising:

• a support body substantially tubular around an axis and having a central body section between opposite end sections,
• said central body section having an inner surface defining a fluid passage,
• each of said support body opposite end sections having
• a first inner surface having a third diameter equal to or greater than said first diameter,
• an end face, and
• a transition surface between said central body section inner surface and each of said support body end section first inner surfaces;
• at least one gasket adapted to fit over one of said first and second pipes and engage said support body end section end face;
• a grip ring encircling said one of said first and second pipes with said gasket between said grip ring and said one support body end section end face;
• and
• at least one fitting nut encircling said grip ring and said at least one gasket, said fitting nut having a tapered inner surface whereby axial movement of said fitting nut toward said support body main body section directly engages said at least one fitting nut against said at least one grip ring to bias said at least one grip ring radially inwardly against said selected pipe in a compression position in which
• said grip ring secures said selected pipe in said support body, and
• said grip ring retains said gasket inside said fitting nut between said grip ring and said one support body end section end face,
• wherein said support body end section end faces are tapered outwardly from the support body end section inner surface to the end section outer surface.

A compression fitting for connecting a selected one of pipes having a range of outer diameters between a maximum diameter and a minimum diameter, comprising:

• a support body substantially tubular around an axis and having a main body section and at least one end section,
• said main body section having an inner surface with a first diameter substantially equal to said minimum diameter,
• said one end section having
• an inner surface having a second diameter substantially equal to said maximum diameter and adapted to receive said selected pipe therein, and
• an end face remote from said main body section, and
• a transition surface between said main body section inner surface and said support body end section inner surface;
• a gasket adapted to encircle said selected pipe and engage said support body end section end face;
• a grip ring adapted to substantially encircle said selected pipe with said gasket between said grip ring and said one support body end section end face;
• and
• a fitting nut encircling and having an annular engagement with said grip ring, said fitting nut having a tapered inner surface whereby axial movement of said fitting nut toward said support body main body section biases said grip ring radially inwardly toward said selected pipe in a compression position in which said grip ring
• is secured around said selected pipe in said support body, and
• retains said gasket inside said fitting nut between said grip ring and said one support body end section end face,
• wherein said grip ring in a radial plane has a V-shaped cross section with a maximum diameter between axial ends of the grip ring, and further comprising a washer within said fitting nut, said washer having an inner diameter less than the maximum diameter of said grip ring whereby said washer and said fitting nut in said compression position engage said grip ring on opposite axial sides of said grip ring maximum diameter.

A compression fitting for connecting a selected one of pipes having a range of outer diameters between a maximum diameter and a minimum diameter, comprising:

• a support body substantially tubular around an axis and having a main body section and at least one end section,
• said main body section having an inner surface with a first diameter substantially equal to said minimum diameter,
• said one end section having
• an inner surface having a second diameter substantially equal to said maximum diameter and adapted to receive said selected pipe therein, and
• an end face remote from said main body section, and
• a transition surface between said main body section inner surface and said support body end section inner surface;
• a gasket adapted to encircle said selected pipe and engage said support body end section end face;
• a grip ring adapted to substantially encircle said selected pipe with said gasket between said grip ring and said one support body end section end face;
• and
• a fitting nut encircling and having an annular engagement with said grip ring, said fitting nut having a tapered inner surface whereby axial movement of said fitting nut toward said support body main body section biases said grip ring radially inwardly toward said selected pipe in a compression position in which said grip ring
• is secured around said selected pipe in said support body, and
• retains said gasket inside said fitting nut between said grip ring and said one support body end section end face,
• wherein said fitting nut tapered surface is at an axial end of said fitting nut and is tapered to a reduced inner diameter around said selected pipe, and said grip ring has a sloped surface engaging said fitting nut tapered surface whereby axial movement of said fitting nut when threaded onto said end section threaded outer surface biases said grip ring radially inwardly toward said selected pipe.