THE LUDLOW HYDRANT.
The Ludlow hydrant, manufactured by the Ludlow Valve Manufacturing company, of Troy, N. Y., of which sectional and exterior views accompany this notice, presents features entirely new. One is the balanced or compensating valve, which admits of the hydrant being operated with the greatest possible ease under extremely high pressure, under low, or any pressure. In hydrants built after this plan there can be no water ram or hammer, and, when the main valve is closed, not a drop of water can remain within the standpipe, the drip or wastevalve being located at the extreme bottom, and so designed as to secure prompt and positive automatic action. Since, also, the barrel or standpipe is completely drained, and, in consequence, ice cannot form to impede the movement of the valves or obstruct the flow there is no need of a frost case.
The whole of the working parts can be quick ly taken out by simply removing the dome and packing plate at the top. The standpipe is not disturtied, and no digging whatever is necessary—a feature which users of the old style compression hydrant will greatly appreciate. The main valve in this hydrant closes both with, and against the pressure. In operation the upper valve opens with the pressure and the lower valve against the pressure. In closing, the conditions are reversed, the lower valve being with the pressure and the upper valve against it. The valve, or double-header, which is faced with rubbers of a special quality, is thus in equilibrium and can be opened or closed without effort. As the hydrant is opened, the drip or waste outlet is at once closed, the drip-valve being drawn up into the bronze drip-cylinder. In closing the hydrant, the drip-valve is pushed out of the bronze cylinder into its flared lower end. The water in the standpipe then passes out through the corrugation is an addition to, or an improvement of the or valve rod. The hydrant is provided with bronze valve-seats, and is fully bronze-mounted throughout.