Fig. 70.—Cross-section of plain self-closing bibb-cock for lead pipe.
Fig. 71.—Cross-section of lever handle, plain bibb.
Fig. 72.—Cross-section of plain Fuller bibb for lead pipe.
Self-closing Bibbs.
—In Fig. 70 is one example of the many styles of self-closing bibb-cocks. When the handle of this cock is turned, the steep-pitched screw A opens the valve and at the same time compresses the spiral spring B, when the handle is released, the valve is pressed back on its seat by the spring. Self-closing cocks are used to prevent the waste of water at drinking fountains, wash basins and other places where the water is apt to be left running through carelessness.
Lever-handle Bibbs.
—Fig. 71 is an example of the lever-handle, ground-key bibb-cock. The key is the piece A, which is tapered and forms a ground joint with the part B. The cock takes its name from the form of the handle. The term ground-key means that the key has been ground into place with emery dust. This cock is kept from leaking by adjustment of the screw C.