How an automatic bypass valve works
The bypass valve maintains a constant pressure difference between the inlet and outlet ports.
The operating principle of the bypass valve is based on the opposition of water pressure and spring force acting on the valve shutter. On one side, the water pressure acts on the shutter, while on the other side, the force of the compressed spring is added to the water pressure from the outlet port.
The spring tries to close the valve, while the water pressing on the sealing element attempts to open it. As long as the force of the compressed spring exceeds the water pressure, the valve remains closed. Once the water pressure exceeds the spring force, the balance is disrupted, and the valve opens.
The degree of opening of the bypass valve is proportional to the force imbalance on its shutter.
The bypass valve can operate in fully open, fully closed, or partially open positions.
It should be noted that the set pressure corresponds to the initial opening of the shutter, while full opening occurs only when the pressure difference is 20-50% higher than the set pressure. Due to this characteristic, bypass valves are characterized by low accuracy.
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