Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 65. Adjustable Die and Stock. valves, as a rule have no air-line connections, but discharge their airinto the rooms; a somewhat objectionable feature. They close whensteam enters them; and if water finds its way in, the float is raised andcloses the outlet. Air-valves for direct radiators have a very small opening for the. Fig. 66. Hand Power Pipe Machine. Fig. 67. Belt Power Pipe Machine. discharge of air, scarcely larger than a pin-hole; and while these doery well for small units, they are not satisfactory for l
Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 65. Adjustable Die and Stock. valves, as a rule have no air-line connections, but discharge their airinto the rooms; a somewhat objectionable feature. They close whensteam enters them; and if water finds its way in, the float is raised andcloses the outlet. Air-valves for direct radiators have a very small opening for the. Fig. 66. Hand Power Pipe Machine. Fig. 67. Belt Power Pipe Machine. discharge of air, scarcely larger than a pin-hole; and while these doery well for small units, they are not satisfactory for large coils or for 270 STEAM AND HOT WATER FITTING 47 iarge groups of indirect radiators, because of the excessive time re-quired to relieve them from air. For such heating surfaces, a type ofair-valve with a much larger opening should be selected, to providefor venting the radiators or roils more quickly. Several types of vacuum air-valves have been invented, designedto permit the escape of air from the radiators, but to prevent its re-entry. If they remain tight, the steam heating system may be run inmild weather with a pres-sure below that of the at-mosphere, and the radiatorkept at a temperature be-low 200°. Pipe-Fitting Tools.—Vise and Bench. When ajob is started, the firstthings needed are vise andbench. The latter shouldbe firmly constructed, andrigidly held in place, thevise to be fir
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