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How does the Model VA-2000 prevent body entrapment?

April 26, 2017body entrapment model va-2000

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How does the Model VA-2000 prevent body entrapment?

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A spring loaded piston located in the SVRS unit forms a seal to prevent air entering the suction system during normal operation. Should a sudden rise in vacuum occur due to an entrapment event, the piston is forced open and the air seal is broken. Under this condition, outside air is allowed to enter the suction side of the pump causing the pump to cavitate, thereby releasing the vacuum.