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Danfoss Eaton Vickers Pilot-Operated Relief Valve 859553 CG5V-8GW-D-M-U-H7-11
Core Functions and Operating Principles
1. Electronically Controlled Loading/Unloading (On/Off Load): By energizing or de-energizing the upper solenoid valve, the main valve can be directly switched between "system pressure regulation mode" and "unloaded flow return-to-tank mode" (unloading). This significantly reduces the motor starting load on the hydraulic pump during idle periods and provides excellent system energy efficiency and heat generation prevention.
2. Remote Control Port (Vent Port): A remote control port is connected in parallel within the valve body, allowing for the external connection of a remote pressure-regulating pilot valve; this enables remote, parallel pressure regulation within multi-stage pressure control circuits.
Troubleshooting & Emergency Field Inspection
| Fault Phenomenon | Possible Root Cause | Field Inspection & Rectification Method |
|---|---|---|
| System fails to build up pressure at all | 1. The main spool is jammed in the open position by contaminants or iron filings in the hydraulic oil. 2. The top solenoid valve is not properly energized or de-energized. |
1. Remove the main valve cover, clean the main spool, and check the damping orifice for clogging. 2. Use a multimeter to measure whether there is a stable 24V DC voltage at the coil plug connector. |
| Pressure cannot be adjusted up (fails to reach 350 bar) | 1. The pressure adjustment spring is fatigued, deformed, or broken. 2. The pilot poppet/seat is severely worn, causing excessive internal leakage and pressure drop. |
1. Unscrew the pressure adjustment knob to inspect if the internal high-pressure "GW" spring is intact. 2. Inspect the contact surface of the pilot poppet for deep scratches; grind or replace the pilot head if necessary. |
| System fails to vent/unload (causing oil temperature to rise rapidly) | 1. The main spool is jammed or stuck in the fully closed position. 2. The internal needle valve of the pilot solenoid is sticking or mechanically jammed. |
1. Press the manual override button forcibly to manually actuate the solenoid and check if the pressure unloads. 2. Clean or replace the top pilot directional valve assembly. |
| Solenoid coil burns out frequently | 1. The field power supply voltage is unstable or fluctuating too high. 2. Moisture/water ingress inside the coil housing, causing a short circuit. |
1. Verify that the power supply module provides a clean and stable 24V DC output under load. 2. Check if the seal ring of the DIN 43650 (ISO 4400) plug is aged or damaged, allowing water entry. |
DETAILS
| DESCRIPTION | Pilot-Operated Relief Valve | PART NUMBER | 859553 CG5V-8GW-D-M-U-H7-11 |
| WEIGHT | 20kg | VOLUME | 180.34 mm × 106.68 mm × 203.20 mm |
| TRUCK MOLDE | Danfoss Eaton Vickers | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | CHASSIS |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
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