Pipe joints or couplings – Packed – With cooperating opposed packing grooves
Patent
1986-08-21
1990-04-03
Shoap, Allan N.
Pipe joints or couplings
Packed
With cooperating opposed packing grooves
60253, 277 26, 277235R, 277DIG6, 285187, 285363, 285911, F16J 1510, F16J 1512, F16L 1902
Patent
active
049134728
ABSTRACT:
A design for sealing metal-to-metal, of sections of rocket shell with fusible vitreous inorganic "glass-ceramic" compositions, which will not burn-out from high temperatures of rocket-exhaust, is disclosed. The design is intended to set up a thermal-gradient across the cross section of the sealed metal flanges. The thermal-gradient utilizes the useful property of the vitreous state of the seal, viz., the continuous viscosity change from the relatively low viscosity of molten glass at high temperature, to a very high viscosity of almost solid state at lower temperatures. This mechanism achieves a leak-proof "glass-ceramic" or glass seal between the metal flange joints of sections of rocket-shell. The vitreous seal is capable of withstanding a wide range of temperature inside the rocket, of -50.degree. C., to over 1000.degree. C., without failure when the rocket is fired. A metal-to-metal joint provided with leak-proof fused inorganic vitreous seal material capable of withstanding high and low temperatures, and the method of making the same are disclosed.
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