Product Overview

The Kobelco ALE Intake Valve Rubber Diaphragm (Valve Cup) is a critical flexible sealing element designed for Kobelco ALE Series (37KW, 55KW, 75KW, 90KW) rotary screw air compressors. Installed inside the pneumatic inlet valve cylinder, it responds to control air signals to actuate the intake piston—precisely managing loading, unloading, and modulation cycles.

Molded from high-flexibility, oil-resistant fluoro-elastomer (FKM/NBR) reinforcement, this diaphragm withstands millions of high-frequency pneumatic strokes, ensuring leak-free performance and responsive air end regulation.

Key Features & Benefits

• High Elasticity & Fatigue Resistance: Engineered to endure rapid pneumatic flexing without cracking, stretching out of shape, or losing sealing tension.

• Superior Oil & Heat Tolerance: Formulated to resist high-temperature synthetic compressor oils and compressed air condensate without swelling or degradation.

• 100% Direct-Fit Specification: Exact dimensional match for Kobelco ALE series intake valves (37KW to 90KW models), ensuring smooth piston movement and easy installation.

• Optimized Energy Efficiency: Delivers airtight pneumatic actuation, preventing air leakage and ensuring instant load/unload responsiveness.

  
  

Technical Specifications

Common Failure Symptoms (When to Replace?)

• Compressor Fails to Load/Unload: Ruptured, perforated, or torn diaphragm causing control air leaks, preventing the piston from opening/closing.

• Slow or Sluggish Valve Response: Aged, hardened, or swollen rubber losing its elasticity, causing pressure fluctuations during operation.

• Control Air Blowing Out: Continuous air venting from the intake valve signal port indicating internal diaphragm puncture.