Rotatable fire sprinkler fitting with elongated gasket
A pipe fitting, useable in the installation of a sprinkler head, includes (a) a body having an open upstream end and an open downstream end, the downstream end having internal threads capable of accepting a threaded male fitting, the body defining a gasket retention area located upstream of the internal threads; and (b) an gasket disposed within the gasket retention area. The gasket retention area and the gasket are chosen so that a threaded male fitting threadedly disposed within the downstream end of the body can be rotated within the downstream end of the body 360° while remaining liquid tight for pressures in excess of 300 psig.
1. A pipe fitting useable in the installation of a fire sprinkler head, the pipe fitting comprising:
(a) a plastic body having a circular cross-section, a longitudinal axis, side walls, an open upstream end and an open downstream end, the open downstream end being sized and dimensioned to axially accept and retain an open pipe end, the downstream end having internal threads capable of accepting a male fitting having external threads which terminate at a fitting end edge, the body defining a gasket retention area located upstream of the internal threads; and
(b) an elongated gasket disposed within the gasket retention area, the elongated gasket having a pair of opposed long sides and a pair of opposed short sides, the gasket retention area comprising a circumferential notch defined in the side walls of the body and a flat gasket retention area base disposed in a plane perpendicular to the longitudinal axis of the body;
wherein the gasket retention area and the gasket are chosen so that said male fitting, when threadedly disposed within the upstream end of the body, is capable of contacting a short side of the gasket with the fitting end edge so as to laterally distort the gasket inwardly, such that the threaded male fitting can be rotated within the downstream end of the body 360° while remaining liquid tight for pressures in excess of 300 psig.
2. The pipe fitting of claim 1 wherein the gasket is made from an elastomeric material.
3. The pipe fitting of claim 1 wherein the gasket is made from an elastomeric material chosen from the group of elastomeric materials consisting of EPDM, neoprene, silicone, buna-N, Hypalon, polyurethane, Santoprene, vinyl and Viton.
4. The pipe fitting of claim 1 wherein the gasket is made from EPDM.
5. The pipe fitting of claim 1 wherein the gasket has a non-round cross-section having a longitudinal axis and a traverse axis, the length l 1 of the gasket cross-section measured along the longitudinal axis being between about 0.25 inches and 0.3 inches.
6. The pipe fitting of claim 5 wherein the cross-section of the gasket has a width l 2 measured along the length of the transverse axis which is between about 0.13 inches and
0.15 inches.
7. The pipe fitting of claim 6 wherein the ratio of l 2 /l 1 is about 0.4 and about 0.6.
8. The pipe fitting of claim 1 wherein the gasket has an internal diameter between about 0.5 inches and about 0.7 inches.
9. The pipe fitting of claim 1 wherein the gasket retention area and the gasket are chosen so that a threaded male fitting threadedly disposed within the downstream end of the body can be rotated within the downstream end of the body 360° while remaining fluid tight for pressures in excess of 600 psig.
10. The pipe fitting of claim 1 wherein the gasket retention area and the gasket are chosen so that a threaded male fitting threadedly disposed within the downstream end of the body can be rotated within the downstream end of the body 360° while remaining liquid tight for pressures in excess of 850 psig.
11. The pipe fitting of claim 1 wherein a fire sprinkler is retained within the downstream end of the body.