Common faults of gas control valve
The main control valve product names of China Control Valve Network include:CV3000-HLS small bore signle seat control valve,CV3000-HMT(HDT) tee confluence(shunt) regulatorCV3000-HSC cage single seat control valve,CV3000-HTS single-seat regulating valveCV3000-HTSW bellows sealing single seat regulatorCV3000-ZHA(B)V venturi angle regulating valveDYH pneumatic regulative butterfly valveDynamic balanced electric control valve,Eccentric rotating control valve,Electric diaphragm control valve
In the W4-60C excavator brake air system, the gas control valve (situated between the air pump and the reservoir) is a critical component for operational safety. Understanding its functions and common failure points is essential for preventing brake failure and maintaining optimal air pressure.
Core Functions of the Gas Control Valve.The valve is engineered to:1,Decontaminate: Separate oil and moisture from compressed air.2,Filter: Remove dust and impurities.3,Regulate Pressure: Stabilize system pressure between 0.490–0.637 MPa (Safety limit: 0.784 MPa).4,Backflow Prevention: Ensure air does not flow back into the pump.
Common Failures & Repair Solutions
1. Damaged Pressure Regulating Diaphragm (Air Leaks)
The most frequent issue in W4-60C models is a ruptured regulating diaphragm.
Symptoms: High-pitched hissing sounds (air leaks) at the valve, high valve temperature, and an air gauge that refuses to rise.
The Cause: As a rubber component, the diaphragm suffers from high-frequency "arching and resetting" actions. Over time, moisture and chemical corrosion lead to perforation.
The Fix: Replace the damaged rubber diaphragm immediately with an OEM-spec part to restore the pressure buildup in the air reservoir.
2. Control Valve Housing Rupture (Structural Damage)
The housing consists of three aluminum sections. Due to the material's nature, it is prone to brittle cracking during maintenance.
Symptoms: Visible cracks in the casing or severe air leakage that cannot be fixed by seal replacement.
The Cause: Improper disassembly. Uneven torque application on the connecting screws causes the aluminum shell to warp and snap.
Professional Maintenance Tip: Always use a diagonal tightening sequence. Loosen or tighten screws in small, even steps to ensure the stress is distributed equally across the mating surfaces.
3 Pro Tips for Excavator Air Circuit Maintenance
To maximize the lifespan of your excavator braking system, follow these routine steps:
Daily Sewage Drainage: Purge the air reservoir daily to remove oil and water accumulation. This reduces the chemical load on the control valve.Pressure Monitoring: Ensure the operating pressure stays within the 0.490-0.637MPa range. Anything outside this window indicates a valve calibration issue.
Acoustic Inspection: Listen for "hissing" sounds. Early detection of a small leak prevents total brake failure during heavy-duty operations.
Do you still need to know or purchase the following control valve products:
- Self-reliance electric temperature regulator
- Self-reliance flow regulator
- self-reliance micro-pressure regulator
- Self-reliance pressure differential regulator
- Self-reliance pressure regulator
- Self-reliance temperature regulator
2026-01-12
