HYDRAULIC PILOT REMOTE CONTROL VALVE FOR EXCAVTOR
1. What is the Pilot Remote Control Valve?
While the Main Control Valve (MCV) handles the high-pressure, high-flow oil that moves the boom and bucket, the Pilot Valve handles low-pressure "signal" oil.
Instead of the operator physically pulling a massive lever connected to a heavy spool, they move a small joystick. This sends a precise amount of pilot pressure to the main valve, telling it exactly how much to open.
2. Key Components of the Valve Body
The valve body is a precision-machined block (usually cast iron or aluminum) that houses several internal parts:
The Housing: The main block containing internal oil galleries.
Plungers/Push Rods: These sit directly under the joystick. When you tilt the handle, you depress a plunger.
Pressure Regulating Springs: These provide the "feel" or resistance in the joystick and determine the pressure output relative to the handle's angle.
Control Spools: Small internal valves that slide to open or close the flow of pilot oil to the ports.
Damping Valves: Often included to prevent "shaking" or jerky movements when the operator releases the handle suddenly.
3. How It Works (The Process)
The operation follows a linear relationship between movement and pressure:
|
Step |
Action |
Result |
|
Neutral |
Joystick is centered. |
Pilot oil is blocked; the main valve remains closed. |
|
Initiation |
Operator moves the lever slightly. |
The plunger compresses the spring, opening the spool just a crack. |
|
Modulation |
Operator moves the lever further. |
Pilot pressure increases proportionally, pushing the main control valve spool further open. |
|
Full Stroke |
Lever hits the limit. |
Maximum pilot pressure is sent; the excavator arm moves at max speed. |
Advantage:
1.Compliant with ergonomics
2.Multi-Axis Proportional Control
3.Ergonomic Precision
4.Integrated Auxiliary Controls
5.Progressive Spring Tension
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