Patent ID: 6171073
Filing Date: 2001-01-09
Classification: A61H,F04B

Abstract:
A device for use in a fluid transfer or fluid circulation system having a pump which draws water from a reservoir through one or more intake lines each extending from an open end at the reservoir to an intake of the pump;said device comprising:means for sensing negative pressure levels in the system;means for establishing an operational range of negative pressure levels between a maximum operational negative pressure level and a minimum operational negative pressure level;means for determining if the sensed negative pressure levels deviate outside of the operational range of negative pressure levels;means for interrupting operation of the pump; andvacuum pressure relief means for introducing positive pressure to the one or more intake lines of the system upon actuation thereof to thereby eliminate suction at the open ends of the one or more intake lines, said vacuum pressure relief means being actuated in response to a sensed negative pressure level being outside of the operational range.