Patent ID: 8641943

Claim:
A method for filling a mold with a compressible liquid material, the mold connected to a manifold via a plurality of runners, at least one valve disposed in at least one of the plurality of runners, such that the at least one valve is in fluid communication with both the manifold and the mold, the method comprising: pressurizing the manifold with the compressible liquid material; modulating the at least one valve to perform a first plurality of pulse cycles during one filling cycle of the mold, wherein a first pulse cycle of the first plurality of pulse cycles includes moving a throttling member of the at least one valve from a first position to a second position, and moving a throttling member of the at least one valve from the second position to a third position, a flow aperture area of the at least one valve corresponding to the second position is larger than the a flow aperture area of the at least one valve corresponding to the first position, a flow aperture area of the at least one valve corresponding to the third position is smaller than the flow aperture area of the at least one valve corresponding to the second position, the throttling member of the at least one valve is moved from the first position to the second position when a measured dwell time in the first position is greater than or equal to a first target time, and when the measured dwell time in the first position is less than the first target time after a measured pressure of the compressible liquid material becomes greater than or equal to a first threshold pressure, and the throttling member of the at least one valve is moved from the second position to the third position when a measured dwell time in the second position is greater than or equal to a second target time, and when the measured dwell time in the second position is less than the second target time after the measured pressure of the compressible liquid material becomes less than or equal to a second threshold pressure.