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 an 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 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 an gasket retention area located upstream of the internal threads; and
(b) an gasket disposed within the gasket retention area;
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 300 psig.
2 . The pipe fitting of claim 1 wherein the body is made from a material chosen from the group of materials consisting of cast iron, steel, copper, brass and cross-linked polyethylene.
3 . The pipe fitting of claim 1 wherein the gasket is made from an elastomeric material.
4 . 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.
5 . The pipe fitting of claim 1 wherein the gasket is made from EPDM.
6 . 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.
7 . The pipe fitting of claim 6 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.
8 . The pipe fitting of claim 1 wherein the ratio of l 2 /l 1 is between about 0.4 and about 0.6.
9 . The pipe fitting of claim 1 wherein the gasket has an internal diameter between about 0.5 inches and about 0.7 inches.
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 fluid tight for pressures in excess of 600 psig.
11 . 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.
12 . The pipe fitting of claim 1 wherein a fire sprinkler is retained within the downstream end of the body.