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The installation sequence and key points of the superimposed hydraulic control check valve are as follows:
1. Installation sequence
Bottom installation
The hydraulically controlled check valve must be used as the bottom valve body and installed close to the foundation plate. This is to ensure the normal pressure-holding function and prevent pressure-holding failure due to improper installation position.
stacking order
In hydraulic systems, the installation sequence of stacked valves usually follows functional requirements. A typical sequence is:
Basic base plate → hydraulic control check valve (bottom layer) → pressure reducing valve/pressure valve → directional valve (such as solenoid directional valve) → flow valve (throttle valve, etc.) → actuator connection plate.
If the system includes an externally controlled pressure reducing valve and a one-way throttle valve, the one-way throttle valve must be located between the externally controlled pressure reducing valve and the hydraulic cylinder; if used together with a hydraulically controlled one-way valve, the hydraulically controlled one-way valve must be located between the externally controlled pressure reducing valve and the hydraulic cylinder.
Oil hole alignment
Before installation, it is necessary to confirm that the oil hole position of the superimposed valve is correct and align all screw mounting holes to ensure smooth oil passage.
bolted
Use grade 12.9 high-strength extension bolts to penetrate all valve bodies, pre-tighten them in diagonal order, and finally tighten them to the specified torque (for example, M10 bolt torque is about 80-100 N·m).
2. Key matters needing attention
direction sign
Hydraulic control check valves are usually marked with arrows to indicate the flow direction of the medium. When installing, make sure the direction of the arrow is consistent with the direction of the system oil line to avoid functional failure caused by reverse installation.
Cleanliness requirements
Before installation, the pipes must be thoroughly cleaned to remove welding slag, metal shavings and other impurities, and use non-woven cloth or special detergent to wipe the pipe interfaces.
Hydraulic oil cleanliness must meet ISO 4406 grade requirements (usually ≤18/16/13) to prevent contaminant particles from damaging the valve body.
Parameter matching
Confirm that the superimposed valve nameplate parameters (such as model, pressure level) are consistent with the system design requirements to avoid failures caused by parameter mismatch.
Electrical wiring
If the system includes an electromagnetic reversing valve, space for electrical wiring must be reserved to avoid bending or stressing the cables. The coil of the solenoid reversing valve should be installed vertically upward or horizontally to avoid jamming caused by inversion.
Voltage regulation and zero calibration
Mechanical zero position: When there is no current signal, adjust the main valve core to the middle position.
Electrical zero: Input current signal to calibrate flow output linearity.
Throttle valve adjustment: Change the throttle opening by rotating the screw to achieve precise flow control.
Overload protection
The overload valve is connected in parallel to limit the locking pressure and automatically drains oil when overpressure occurs to protect system safety.
3. Special scene processing
Used together with one-way throttle valve
When the hydraulic control check valve and the one-way throttle valve are used together, the check valve needs to be placed between the hydraulic control check valves to ensure that the system control logic is correct.
Main reversing valve center function
For systems using hydraulically controlled check valves, the center function of the main reversing valve must be Y-type or Yx-type to meet pressure maintenance and oil return requirements.
Pressure gauge switch position
The pressure gauge switch must be located close to the base plate in order to accurately monitor system pressure.
