Multi-function cartridge valves condense most of a machine's hydraulic controls into a single hydraulic integrated circuit, or incorporate valves into the body of other hydraulic components.A new range of multi-function cartridge valves, designed for use in integrated hydraulic circuits and perform duties normally requiring two or more cartridges, has been introduced by Integrated Hydraulics of Warwick, UK. These screw-in hydraulic cartridge valves from Integrated Hydraulics, '4CKKT50', offer the machine designer the potential of condensing the majority of a machine's hydraulic controls into a single hydraulic integrated circuit (manifold block), or incorporating valves into the body of other hydraulic components, such as cylinders. This reduces installation time and space requirement whilst minimizing leak paths, facilitating servicing and improving performance.
The 4CKKT50 valves are dual pilot operated check units with thermal relief and are rated at 300 bar with 25 litre/min flow.
They are ideal for small to medium size stabilizer cylinder applications, simplifying their design by eliminating the need for three cavities and a series of cross holes previously demanded.
The valve will hold the stabilizer legs in both extended and retracted positions, with the relief element preventing over pressurization of the cylinder due to thermal expansion of the oil.
In operation, pressure on the valve port causes the poppet to lift against the spring force, allowing flow to the cylinder port.
Reverse flow is prevented by the poppet reseating.
Pressure applied to the pilot port will overcome the cylinder port pressure and lift the poppet from its seat, allowing flow from the cylinder to valve port.
In dual pilot check valves, each pilot section is cross connected to the opposite line, giving automatic pilot operation in both directions.
When pressure is applied to port 3, the poppet in line 2,1 opens allowing return flow and vice-versa.
The direct acting relief valve is located in the poppet controlling flow in ports 3,4.
When the pressure in port 4 rises above the setting of the relief valve, the relief valve will open, allowing flow to port 3, relieving pressure on the cylinder.
Integrated Hydraulics' new 4CKKT50 cartridge fits in the same cavity as the company's series 5 solenoid valves so requires no additional tooling.
Internal leakage past the poppet valves is 0.3ml/min in one line and 0.5ml/min in the other.