Single Release Valve – Pressure Control Unit for Semi-Trailer Parking Brake Systems

Description

The Single Release Valve (Part No. 9630060030) is a critical pressure control unit in semi-trailer parking brake systems, designed to rapidly exhaust compressed air from brake chambers upon release, ensuring prompt brake shoe retraction. Featuring a ​high-strength aluminum alloy body (hard-anodized) and ​stainless steel spring (≥5 million cycles), it operates at ​0.6~1.0MPa with ≤0.3s response time and ≤0.1mL/min leakage (@1.0MPa), compliant with ISO 16028 and SAE J1453.

Core Functions:

1. ​Pressure Release: Instant exhaust via tapered spool-spring mechanism for complete brake disengagement.
2. ​Reverse Blocking: Integrated check valve prevents backflow-induced accidental braking.
3. ​Environmental Resistance: PTFE seals (-40℃~150℃) and 50μm dust filter protect against contaminants.

Key Importance:

• ​Brake Efficiency: Delayed release causes shoe drag and energy loss.
• ​Material Impact:
  • ​Spool Material: Hardened stainless steel (Ra≤0.4μm) minimizes wear.
  • ​Spring Precision: ±0.02mm wire tolerance ensures consistent operation.
  • ​Lightweighting: Aluminum body reduces weight by 60% vs. cast iron.

Replacement Guidelines:

1. ​Orientation: Align valve arrow with airflow direction.
2. ​Leak Test: Post-installation pressure drop ≤0.02MPa @1.2MPa/5min.
3. ​Filter Maintenance: Clean/replace filter every 6 months or 50,000 km.
4. ​Lubrication: Use silicone grease (e.g., Molykote 111) only.