Overview Cosman's visual adjustment differential pressure bypass valve is a small self-operated differential pressure bypass valve. By sensing the pressure difference between the supply and return sides, the bypass valve will automatically adjust slowly when the pressure difference reaches a preset value. The opening degree of the valve makes the water flow passing through the pressure differential bypass have a gradual adjustment process; it is used to control the basic water flow of the small central air conditioner or gas boiler water system to ensure the reliable operation of the system.
The advantage of Cosman's visual adjustment differential pressure bypass valve is that it does not require external power. It works by the pressure difference of the system itself, which effectively improves the operating safety factor. It is safer and more reliable than the traditional electric differential pressure bypass valve, and solves the electric differential pressure bypass. The case of a valve failure due to a circuit failure.
Selection advice 
Installation instructions 1. Pressure differential bypass valve installation location: position 1. Installed on the main water inlet and outlet main pipe. The air source heat pump system is recommended to install a buffer water tank. The buffer water tank is installed in the circulation circuit of the pressure differential bypass, so as to bypass When the valve is opened, the water in the buffer tank also participates in the circulation (as shown in the following figure), which can increase the amount of circulating water bypassed by the pressure difference; Position 2, installed on the supply and return water main line of the coil that is the farthest from the host; 2. The pressure differential bypass valve has a water flow direction indication. During installation, pay attention to the direction of the bypass water flow must be consistent with the system water flow direction, otherwise the pressure differential bypass will fail;
3. When the main engine cooling capacity is too large, and DN32 cannot meet the system pressure differential bypass flow requirements, multiple pressure differential bypass valves with the same caliber pressure differential setting value can be used in parallel (as shown below):
Debugging method When the pressure difference of 0.5-3Bar pressure range is selected, the valve for returning to the main pipe is closed during debugging, similar to the case where the fan coil is completely closed, adjust the pressure knob counterclockwise to 0.5Bar, and the pressure difference is bypassed at this time The pressure is minimum, the bypass water flow is maximum, start the host and the pump, and slowly adjust the clockwise adjustment knob to pressurize until the host lacks water protection trip, then the scale value of the pressure is the critical point, and then the pressure The knob reverses the maximum pressure of the differential pressure bypass counterclockwise, 10% of the pressure 3Bar, which is about 0.3Bar (almost a small grid scale); after the pressure differential bypass debugging is completed, start the host test run again to confirm the debugging results. (If the bypass pressure range of differential pressure is 0.2-1Bar, then return to 0.1Bar at the critical point, which is also a small scale) 
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