Is the exhaust valve of a centrifugal pump generally installed on the pump itself or on the outlet pipeline?
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Is the exhaust valve of a centrifugal pump opened only once during startup to release air, and then closed after that? Is this exhaust valve located on the pump body, or on the inlet or outlet line? Additionally, why is an exhaust valve installed on the inlet line of the condensate pump used in reforming processes, connected to the condenser?
The exhaust valve of a centrifugal pump opens briefly to release air when the pump is started, and then closes after the air has been released. Venting ensures that the pump is completely filled with liquid, removing all gas to prevent air locking when the pump is started. The exhaust valve is installed on the outlet pipeline. Is the inlet pipeline of the condensate pump a drain line?
On the pump’s outlet pipeline, 30 centimeters in front of the outlet valve.
It is generally installed on the outlet pipeline, which is quite convenient.
High point before the outlet valve of the pump outlet pipeline
This post was last edited by Watt Energy Saving on 2017-5-24 23:30. The exhaust valve for the pump can be installed on the pump body or at the highest point in the pipeline behind the pump. The reason is that the installation location must be the point where air is released and accumulated. Traditional exhaust valves are float-type (or ball-type) exhaust valves ； And this exhaust valve cannot distinguish between steam and air. When the condensate pump is in operation, high-temperature condensate undergoes flashing, and what the vent valve actually discharges is mainly flashed steam, which therefore needs to be returned to the condenser. Hangzhou Watt Steam Engineers believe that at this point, the exhaust valve functions as a balancing valve.
Backwashing at the pump inlet – used to drain the condensate inside the pump during maintenance, I guess
1. The exhaust valve of the centrifugal pump opens briefly during pump startup to release air, and then closes after the air has been expelled. Venting ensures that the pump is completely filled with liquid, removing all gas to prevent air locking when the pump is started. 2. The exhaust valve is installed on the outlet pipeline. 3. The inlet pipeline of the condensate pump is a drain line, I guess.
Piping exhaust valves are generally installed at the high point of the pump outlet pipeline, with the valve opening facing upward; they are not necessarily located behind the check valve. Used for pipeline venting. This feature is rarely used. It is only opened for inspection when it is necessary to check whether the pipeline is filled with liquid. It is installed based on the functional requirements of the pump; the pump’s suction inlet must not allow air to enter. A check valve is installed in front of the exhaust valve, which is why the exhaust valve is used very rarely
The recirculation pipe connected to the condensate pump is also mainly used to address the problem of cavitation in the pump. To prevent cavitation in the condensate pump, a certain flow rate must be maintained. At no-load and low-load conditions, the amount of condensate water is small, so the condensate pumps operate at a low water level. Cavitation becomes increasingly severe, and the operation of the condensate pumps becomes highly unstable. In such cases, by using a recirculation pipe, a portion of the water discharged by the condensate pumps is sent back to the condenser, which helps to ensure the proper operation of these pumps. Furthermore, the shaft seal coolers and the coolers of the steam ejectors must have sufficient condensate flowing through them under no-load and low-load conditions; therefore, the condensate recirculation pipes are generally connected behind them.