E307D Hydraulic Excavator Main Relief Valve Circuit Overload Cartridge Solenoid
E307D Main Circuit Overload Relief Cartridge Valve Assembly For E307D
Adopts high wear-resistant alloy steel spool and high fatigue-resistant silicon manganese pressure spring, stable calibrated relief pressure without drift under long-term 260bar high-pressure hydraulic oil and frequent heavy load impact. Effectively eliminate aging defects of original valves: relief failure, insufficient digging force, internal spool sticking, oil leakage at thread sealing surface. Stable mass production, sufficient stock for fast delivery.
| Specification | Details |
|---|---|
| Brand | ZVEZDA |
| Applicable Model | E307D Mini Excavator Main Hydraulic Circuit |
| Product Type | Full Alloy Steel Hydraulic Main Circuit Overload Relief Cartridge Valve (Main Valve) |
| Rated Relief Pressure | 240–260 Bar Main System Standard Pressure |
| Instant Peak Bearing Pressure | 300 Bar |
| Sealing Material | Double-Layer HNBR High Pressure Oil Resistant O-Ring |
| Cartridge Material | Anti-Corrosion High Strength Alloy Steel |
| Origin | China |
| Delivery Time | 1–7 Working Days After Payment |
| Warranty | 6 Months Under Continuous Excavator Working Condition |
| Packaging | Neutral Carton Packing, No Brand Logo |
| Supporting Accessories | Complete Cartridge Valve + Spare HNBR Seal O-Rings |
| Sample Service | Single Sample Available With Relief Pressure Stability Test Report |
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Q1: Which mini excavators fit ZVEZDA E307D main relief valve?
A: Direct replacement for E307D mini excavators, standard cartridge size, directly insert into main valve block without modifying valve cavity. In stock, ship within 1–7 working days.
Q2: Excavator still weak digging and engine stall under heavy load after replacement?
A: Fatigued pressure spring leads to drifted relief pressure, replace complete ZVEZDA integrated main relief cartridge to restore standard main circuit pressure and normal digging power.
Q3: Can this main relief valve replace swing relief valve or unloading valve?
A: Not interchangeable. This medium-high pressure hydraulic cartridge valve is used for main circuit overload protection; swing relief valve controls swing dedicated hydraulic pressure, unloading valve adjusts idle medium pressure, different medium, pressure range and working principle.
Q4: Core advantages of ZVEZDA E307D main relief valve?
A: High strength alloy steel anti-wear spool, high fatigue resistant silicon manganese pressure spring, stable fixed relief pressure, double-layer HNBR high pressure anti-leakage sealing, full anti-rust precision ground cartridge body, OEM standard cartridge dimension direct replacement, neutral unbranded packaging, perfectly match E307D main hydraulic overload protection system.
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