Bypass pressure on a pump refers to the pressure at which a bypass valve opens, diverting flow, usually from the pump outlet back to the reservoir, to control the system's pressure. According to the provided reference, pressure bypass valves control pressure by diverting a portion of the flow, often bypassing fluid from the outlet of a pump back to the reservoir. This type of valve is functionally a back pressure regulator (BPR).
Essentially, it's the maximum pressure allowed in the system before the valve activates to protect the pump and other components.
Here’s a breakdown:
- Purpose: To protect the pump and system components from overpressure.
- Mechanism: A bypass valve opens when the pressure reaches a pre-set level (the bypass pressure).
- Action: The valve diverts a portion of the pump's output flow, typically back to the pump's inlet or a reservoir.
- Function: Maintaining the pump's pressure at or below the set bypass pressure.
Here's a practical example of how bypass pressure works:
Imagine a hydraulic system where the pump is designed to operate at a maximum pressure of 100 PSI. The bypass valve is set to open at 100 PSI.
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Normal Operation: As long as the system pressure remains below 100 PSI, the bypass valve stays closed, and all the pump's output goes to the system.
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Overpressure Event: If a blockage or other issue causes the pressure to rise above 100 PSI, the bypass valve opens.
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Flow Diversion: The valve diverts a portion of the pump's output back to the reservoir, preventing the pressure from exceeding 100 PSI.
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Protection: This protects the pump and other components from damage due to excessive pressure.
In summary, bypass pressure is the pressure threshold at which a bypass valve activates to safeguard a pump and its system by diverting excess flow.
