For example, the nominal pressure is less than the system test pressure; the water supply branch pipe uses a gate valve when the pipe diameter is less than or equal to 50mm; the hot water heating dry and riser uses a shut-off valve; the fire pump suction pipe uses a butterfly valve.
Consequences: affecting normal opening and closing and adjusting resistance, pressure and other functions. It even caused damage to the system during operation and was forced to be repaired.
Measures: Familiar with various application scopes, select specifications and models according to design requirements. The nominal pressure must meet the requirements of the system test pressure. According to the requirements of the construction specifications: the water supply branch pipe diameter is less than or equal to 50mm should be used globe valve; when the pipe diameter is greater than 50mm should be used gate valve. Gate valves should be used for hot water heating dry and vertical control valves, and butterfly valves should not be used for suction pipes of fire pumps.
