Water supplying pipe in front of the coal economizer should be installed with a stop valve and check valve for the factory using boiler of mother tube water supplying.

• 7采用母管制供水的电厂，进入每台锅炉省煤器前的给水支管均应装设截止阀与逆止阀。两阀应紧接，按水流方向逆止阀在前。