To determine whether the hydraulic valve is compatible, it can be verified layer by layer from four dimensions: core parameter matching, installation interface standards, electrical and control logic, and working condition and medium adaptation, covering the vast majority of replacement and new system adaptation scenarios.
⚙️ Matching of core performance parameters
Pressure rating: The rated working pressure of the new valve must be ≥ the maximum working pressure of the system. Under high-pressure conditions (31.5MPa~70MPa), the impact resistance and fatigue resistance of the valve components need to be confirmed to avoid pressure drop and leakage problems.
Diameter and flow rate: The rated flow rate of the valve should cover the actual maximum flow rate of the system. A diameter that is too small can lead to excessive flow resistance and pressure loss, while a diameter that is too large can cause a decrease in control accuracy.
Function type: Confirm that the functional attributes of the valve (directional valve/pressure valve/flow valve/proportional valve, etc.) are completely consistent with the circuit requirements, such as plug-in valves adapted to high flow and high pressure circuits, and stacked valves adapted to integrated pipeless systems.
Verification of installation interface standards
Connection form: For plate connections, it is necessary to verify the installation hole positions and oil port positions according to the ISO 4401 series standards. For threaded connections, it is necessary to confirm that the thread specifications of G metric and NPT cone pipes are completely matched to avoid forced modification and leakage.
Installation dimensions: Measure the distance between the installation holes of the valve, the specifications of the fixing bolts, and the total height of the valve body. For the stacked valve, confirm the positioning pin position and sealing groove size of the stacked surface to ensure that it can be installed into the existing valve group space.
Oil port layout: The relative positions of the inlet, return, and working oil ports must correspond exactly to the original valve/valve block, otherwise there may be problems such as reversed oil circuit connections and disordered action logic.
Electrical and control logic adaptation
Power parameters: The voltage type (AC/DC), rated voltage value, and power of the solenoid valve coil must be completely matched with the electronic control output. Mixing different specifications such as 24VDC and 220VAC can easily cause the coil to burn out or fail to engage.
Interface form: Check the pin definition, output direction, and whether it has surge suppression/indicator light function of the plug to avoid interference between the cable and surrounding valves, or impact on the PLC output module.
Control logic: Confirm that the action logic of single/double coil configuration, neutral spring reset/electromagnetic hold is consistent with the system design. When replacing the double coil valve, ensure that the parameters of the coils on both sides are completely matched.
Signal communication: Proportional valves/servo valves need to confirm compatibility with analog signals (0-10V/4-20mA), industrial communication protocols (PROFINET/CANopen, etc.), and controllers.
Compatibility between working conditions and media
Media adaptation: The sealing material (nitrile rubber/fluororubber/polyurethane) should be compatible with the mineral oil, synthetic oil or special media used in the system to avoid swelling and failure after long-term immersion.
Environmental tolerance: Confirm that the working temperature range and protection level (IP65, etc.) of the valve meet the on-site environment, and additional verification of anti vibration and anti impact performance is required for engineering machinery and mining scenarios.
Action frequency: For frequent switching conditions, it is necessary to confirm the lifespan of the valve core and the heat dissipation capacity of the coil, in order to avoid excessive temperature rise and insulation aging caused by continuous long-term power on.
After completing the above verification, a low-voltage no-load power on test can be carried out first to confirm that the valve core reversing action is smooth and free of jamming, and then gradually increase the pressure to the system rated pressure to verify that the pressure and flow control are stable and leak free during loaded operation, confirming full compatibility.