These are to be 2-1/2-inch straightway brass valves, without cap, and similar and equal in quality to those made by the Chapman Valve Company, the Ludlow Valve Company, or the Lunkenheimer Company. The hose-screw at end of these valves is to be fitted to a hose coupling furnished by the customer, or where this cannot be procured may be left with the thread uncut. To accommodate locations where all the lines of hose must lead off from one side of the pump—makers can furnish a spool piece or special casting to which the hose valves can be attached—but this is an extra not included in the regular price. 43. SAFETY VALVE. [Illustration: FIG. 11.] _a._ A safety or relief valve of the Ashton, Crosby, American, or other make agreed upon in writing with this office, is to be regularly included in the price, and is to be attached to each pump; preferably extending horizontally inboard from base of air chamber, as shown in Fig. 12, so that its hand-wheel for regulating pressure is within easy reach. This hand-wheel must be marked very conspicuously as shown in Fig. 11. _b._ This valve is to be set ordinarily at a working pressure of 100 pounds to the square inch, and is to be of such capacity, that when set at 100 pounds it can pass all the water discharged by the pump at full speed, at a pump pressure not exceeding 125 pounds per square inch. For 500-gallon pump a 3 inch valve. For 750-gallon pump 3-1/2 inch valve. For 1,000-gallon pump 4 inch valve. For 1,500-gallon pump 5 inch valve. The relief valve must discharge in a vertical downward direction into a cone or funnel secured to the outlet of the valve. (See Art. 44.) [Illustration: FIG. 12.] The valve must be so attached to the delivery elbow and discharge cone by flange connections as to permit of its ready removal for repairs without disturbing the waste piping. 44. DISCHARGE CONE. _a._ This cone should be so constructed that the pump operator can easily see any water wasting through the relief valve, and its passages should be of such design and size as to avoid splashing water over into the pump room. _b._ The cone must also have a one-inch tapped connection for the air-vent pipe required by Art. 45, and the arrangement must be such that the pump operator can easily tell whether water is coming from the air pipe or is wasting through the relief valve. _c._ The cone should be piped to some point outside of the pump house where water can be wasted freely, the waste pipes being as below. ===============+==================== SIZE OF | DIAMETER OF WASTE PUMP. | PIPE FROM CONE. ---------------+-------------------- 500-gallon. | 5 inches. 750 „ | 6 „ 1,000 „ | 7 „ 1,500 „ | 8 „ ---------------+--------------------