. Hot water supply and kitchen boiler connections : a text book on the installation of hot water service in residences and other buildings and methods of connecting range boilers, steam and gas water heaters. rous pres-sure is liable to be raised. This danger can be avoided by the provision of a safetyvalve on the boiler, but there is another method which appealsto many who do not care to have the safety valve. This con-sists of making a by-pass around the meter and check valveand in this by-pass to fit another check valve with the swing-ing valve working in the opposite direction. This as wil
. Hot water supply and kitchen boiler connections : a text book on the installation of hot water service in residences and other buildings and methods of connecting range boilers, steam and gas water heaters. rous pres-sure is liable to be raised. This danger can be avoided by the provision of a safetyvalve on the boiler, but there is another method which appealsto many who do not care to have the safety valve. This con-sists of making a by-pass around the meter and check valveand in this by-pass to fit another check valve with the swing-ing valve working in the opposite direction. This as will beseen from the illustration in Fig. 138 allows any excess pres-sure generated by the expansion of the water to be relievedthrough this valve, as immediately the pressure exceeds thatcarried in the water main the check valve will open and allowwater to flow back into the main pipe. Either a globe or a swinging check valve may be used butthe latter is generally used in hot water work owing to its 176 HOT WATER SUPPLY. lighter action. Another method is simply to drill a small holein the check valve that is fitted behind the meter. This iscalculated to relieve the pressure as it is generated but not to. Fig. 137. Method of Connectinor a Double Boiler. To Main
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