Issues with the reciprocating oil station.
Thread Content
The newly installed fuel station has two pressure regulators: one regulates the pressure at the pump outlet, and the other regulates the pressure at the fuel injection point. Now, shut off the pressure regulation circuit at the pump outlet; the pressure at the pump outlet is too high, but the pump is operating normally. If the pump outlet pressure control valve is installed, it can regulate the pump outlet pressure, but the pump makes a lot of noise at this time. It feels like there’s air inside. It doesn’t work even after exhausting the air.
When replacing an oil station, it is necessary to ensure that its various performance parameters are consistent with those of the previous station. In other words, the parameter for the pump outlet pressure must remain the same as before, and it must also be the same at the lubrication points. For example, if the pump outlet is required to be at 0.6 MPa, a safety valve in the system is used first to set the activation pressure for automatic pressure regulation. The oil pressure at the lubrication point is controlled by the throttle valve (adjustment throttle bolt) ahead of the lubrication point. Before this, in the flow path back to the fuel tank, a return valve (short-circuit valve) should be installed, which can be used to adjust the system oil pressure at the pump outlet and at various lubrication points. It’s best to send a picture (flowchart). The noise could be the sound of oil return caused by the pressure regulation valve on the pump being activated. Just adjust the bypass valve. There might be some air, but it will disappear after running for a while.
In gas stations, the pressure regulating valve at the pump outlet is called a relief valve (backpressure valve), while the pressure regulating valve at the fuel supply port is called a pressure reducing valve. Most of these valves are self-acting, but there are also pneumatic and electric types. Due to the requirements of oil station design standards, the rated flow rate of the pump is higher than the required flow rate; the excess flow then has to return to the tank through the relief valve. If the relief valve closes, it will cause the pressure in the section from the pump outlet to the pressure regulator to keep increasing, resulting in increased vibration of the pump, increased noise, and increased vibration in the pipelines, until the safety valve opens. This constitutes an accident and is not allowed. I’m not aware of the reason for shutting down the relief valve; I do not recommend doing so.