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Q1: What is the product identification and applicable scope of the Yn35V00049f1/Kdrde5kr-31 40c50-213 solenoid valve?
A1: The Yn35V00049f1 and Kdrde5kr-31 40c50-213 are OEM-compatible high-performance solenoid valves—core hydraulic control components exclusively engineered for Kobelco SK200-8 (20-ton class), SK230-8 (23-ton class), and SK350-8 (35-ton class) 8-series mid-to-heavy duty excavators:
Core Product & Compatibility Details
- Model Differentiation:
- Yn35V00049f1: Primary OEM replacement for SK200-8/SK230-8, designed for main hydraulic system flow regulation (boom/arm/bucket action control);
- Kdrde5kr-31 40c50-213: High-pressure variant for SK350-8 and SK230-8 heavy-load configurations, focusing on hydraulic pump pressure control and overload protection.
- Applicable Excavators & Engines:
- SK200-8: Equipped with Kobelco J05E diesel engine (114kW @ 2100rpm), used in municipal engineering, medium-scale earthmoving, and infrastructure construction;
- SK230-8: Fitted with Kobelco J05E engine (129kW @ 2100rpm), deployed in foundation works and small-scale quarrying (medium-heavy load);
- SK350-8: Matched with Kobelco J08E diesel engine (184kW @ 2000rpm), targeted for large-scale quarrying, mining auxiliary work, and heavy infrastructure projects.
The valves are suitable for fault replacement (e.g., coil burnout, valve core jamming, oil leakage, signal failure) and routine hydraulic system maintenance, ensuring precise fluid control for Kobelco 8-series excavators’ operational efficiency and stability.
Q2: What is the working principle and core functions of the solenoid valves for SK200-8/SK230-8/SK350-8?
A2: As key “electromechanical switches” for the hydraulic systems of Kobelco 8-series excavators, these solenoid valves regulate hydraulic oil flow and pressure via electromagnetic induction, with functions tailored to each model’s load demands:
Working Principle
- When energized with DC 24V power (standard for Kobelco 8-series), the internal coil generates a magnetic field that pulls the plunger, adjusting the valve core opening to control hydraulic oil flow direction and volume. When power is cut off, the return spring resets the valve core to the default position, cutting off or diverting fluid flow.
- For SK350-8’s Kdrde5kr-31 40c50-213, the valve core opening is dynamically adjusted via PWM (Pulse Width Modulation) signals from the ECM, enabling stepless pressure regulation for heavy-load scenarios.
Core Functions
- Precise Hydraulic Control: Regulates hydraulic oil flow for excavator working mechanisms (boom lifting, arm extending, bucket digging) with response time ≤0.08s, ensuring smooth and accurate operation even during rapid load changes;
- Load-Adaptive Pressure Regulation:
- SK200-8/SK230-8 (Yn35V00049f1): Maintains stable pressure (max 34.3MPa) for medium-load operations, optimizing fuel efficiency and reducing hydraulic system wear;
- SK350-8 (Kdrde5kr-31 40c50-213): Supports high-pressure operation (max 37.5MPa) for heavy digging and mining, with overload protection to prevent system damage;
- ECM Communication & Fault Diagnosis: Transmits real-time valve status signals to the excavator’s ECM, triggering Kobelco-specific Diagnostic Trouble Codes (DTCs) for anomalies (e.g., coil short circuit, signal drift) to facilitate quick troubleshooting;
- Emergency Protection: Automatically switches to pressure relief mode if the valve core jams or power fails, protecting the hydraulic pump, cylinders, and pipelines from catastrophic damage;
- Low-Power Operation: Standby power consumption ≤0.4W, reducing battery drain during long-term equipment standby.
Model-Specific Optimizations
- SK200-8: Yn35V00049f1 optimized for energy efficiency, with balanced flow control to match the J05E engine’s output;
- SK230-8: Yn35V00049f1 with enhanced vibration resistance (≤18g) for medium-heavy load construction sites;
- SK350-8: Kdrde5kr-31 40c50-213 with reinforced valve body and high-pressure seals, adapting to the J08E engine’s high hydraulic demand and frequent overload scenarios.
Q3: What are the key technical parameters of the Yn35V00049f1/Kdrde5kr-31 40c50-213 solenoid valves?
A3: All parameters are calibrated to Kobelco 8-series excavators’ hydraulic and electrical system requirements:
| Parameter | Yn35V00049f1 (SK200-8/SK230-8) | Kdrde5kr-31 40c50-213 (SK350-8) |
|---|---|---|
| Operating Voltage | DC 24V (20–28V wide range) | DC 24V (20–28V wide range) |
| Rated Current | 1.2A | 1.5A |
| Working Pressure Range | 0–34.3MPa | 0–37.5MPa |
| Response Time (Open/Close) | ≤0.08s / ≤0.06s | ≤0.07s / ≤0.05s |
| Coil Resistance | 42–45Ω | 38–42Ω |
| Protection Rating | IP67 (dust/waterproof) | IP67 (enhanced sealing) |
| Operating Temperature Range | -40℃ ~ +90℃ | -40℃ ~ +100℃ |
| Vibration Resistance | ≤18g (10–2000Hz) | ≤22g (10–2000Hz) |
| Mounting Interface | M14×1.5 threaded (hydraulic valve block) | M16×1.5 threaded (high-pressure valve block) |
| Connector Type | 4-pin waterproof socket (Kobelco standard) | 4-pin waterproof socket (Kobelco standard) |
| Compatibility | SK200-8/SK230-8 J05E engine | SK350-8 J08E engine |
| Service Life | ≥8,000 operating hours | ≥7,500 operating hours |
