Slip in cartridge valves are two port valves that can be inserted into compact manifold control blocks, having cavities that are machined as per ISO 7368. The function of the cartridge valve depends on the type of control cover used. With the help of suitable control cover the cartridge valve can assume pressure, directional, throttling or combination of these function. Cartridge valves are available in two area ratios and four cracking pressures. Depending upon the function required, cartridge valve having Suitable area ratio must be used.