Patent ID: 7520329

Claim:
A valve for use in a downhole tool, the valve comprising a substantially tubular body including a first end for connection to a wireline lock or packer in a work string, the first end having a first inlet for communicating with the work string providing a flow path of a first cross-sectional area; one or more ports located on the body, the ports providing a flow path of a combined cross-sectional area greater than the first cross-sectional area; a sealing assembly comprising a seal cap moveable in relation to the body to open and close the ports; the seal can being a poppet having a first sealing surface and a second sealing surface being a seat located on an inner surface of the tubular body such that when the surfaces contact they form a seal to close the valve; the sealing assembly including biasing means to bias the poppet and the first sealing surface towards the second sealing surface; wherein a load adjuster is located between the biasing means and the first surface to vary the load applied by the first surface upon the second surface and fluid flow through the inlet moves the seal cap to open the valve and create an unimpeded flow path between the inlet and the ports with negligible pressure drop.