Minimum flow valve with pneumatic actuator
Nominal pressure: PN 320
Nominal diameter: DN 50
Temperature range: 200°C
Working position: horizontally
The valves are applied for maintaining the constant efficiency of boiler supply pumps through opening. In correct moment, the valve on pipeline is connecting joint of supply water pump with boiler. It protects pump against damage during the work with low efficiency.
Minimum flow valve works as safety valve protecting supply installation, especially pumps. Efficiency in pumps can not be lower than designed value. Inevitable result of efficiency drop will be inadmissible, increasing the supply water temperature and causing appearance of inevitable cavity. During the specific periods of boiler operation, like starting or pressure drop, the water quantity requirement is lower than necessary to correct cooling of the pump. In the purpose of maintaining the constant efficiency of supplying pump it is necessary to make by-pass installation with minimum flow valve. Minimum flow valve should ensure proper cooling of pump, even when there will be no supply water requirement.