| 摘要 |
FIELD: water-heating appliances, in particular, assembly of multiple-section hot-water batteries. SUBSTANCE: the nipple has a bushing with inner collars and symmetrically cut left-hand and right-hand outside threads, a groove with a width of one and a half-two turns of each thread and a depth equal to the depth of the cut threads is made on the line of symmetry. EFFECT: provided a tight connection of sections at a probable non-simultaneous entry of the nipple threads in the threads of the connected sections. 1 dwg |
