ST-50G Unloader Valve SH380A-3511010

Product Introduction

This SH380A-3511010 ST-50G unloader valve is an integrated pneumatic control component for construction machinery air brake circuits. It stabilizes the working pressure of the air compressor, automatically unloading when air pressure reaches the upper limit and reloading once pressure drops to the preset lower value. It also integrates pressure protection and automatic drainage functions to remove oil and water condensate inside the air circuit, protecting downstream pneumatic parts.

The valve body is made of high-strength cast aluminum alloy with precision internal piston and spring assembly. The surface treatment delivers good corrosion resistance for dusty and humid construction working environments. Multiple air ports are rationally arranged for convenient pipeline connection. The built-in pressure regulating mechanism can be calibrated to maintain stable system pressure, preventing overpressure damage to air tanks and brake components. All port thread specifications and mounting dimensions follow OEM standards for direct replacement. It effectively avoids brake failure caused by unstable air pressure or condensed water buildup.

Manufactured strictly in accordance with OEM dimensional standards, this unloader valve can directly replace original spare parts without modification. We supply OEM equivalent and premium aftermarket quality grades. Every finished unit undergoes air tightness and pressure switching performance testing before shipment. Export-grade packaging and complete customs documents are available for overseas construction machinery repair shops and equipment distributors.

Key Features

• Part number: SH380A-3511010, ST-50G unloader valve for pneumatic brake system
• Integrated design: pressure unloading, pressure limiting and condensate draining
• Cast aluminum valve body, lightweight and anti-corrosion
• Precision internal spring and piston assembly, stable pressure switching
• Multiple air ports for simple pipeline layout and installation
• Protects air compressor and air tank from overpressure
• OEM matched thread and mounting dimensions, direct replacement
• In stock, factory direct export, mixed container loading available

Why Choose Our SH380A-3511010 Unloader Valve

1. Professional Construction Machinery Pneumatic Parts Specialization

We specialize in air control valves and pneumatic components for wheel loaders and truck cranes. Our team masters air circuit matching and commissioning requirements, providing accurate part matching and professional technical guidance for pneumatic system overhaul projects.

2. Strict Air Tightness & Pressure Performance Control

All unloader valves are inspected for air tightness, cut-in and cut-out pressure accuracy. Each unit is checked for piston responsiveness, eliminating hidden risks such as air leakage, pressure drift and failed unloading.

3. Multiple Quality Grades for Global Market

We offer OEM equivalent and premium aftermarket versions to meet different procurement demands. OEM equivalent products match original structural performance and dimensions completely. The aftermarket option provides cost-effective replacement for regular fleet maintenance, both with stable quality guarantee.

4. Ready Stock & Fast Shipment

We maintain abundant spot inventory of SH380A-3511010 ST-50G unloader valves. Products are sorted by part number for quick picking. We support shipment within 3–7 working days and mixed loading with other construction machinery spare parts to cut logistics expenses.

5. Export-Grade Packaging & Full Set Documents

The unloader valve is wrapped with bubble film and packed in shockproof cartons. All air ports are sealed with plastic plugs to prevent dust and debris entering during long ocean transport. Our foreign trade team provides complete customs documents including packing list, commercial invoice and inspection certificate for smooth import clearance.

6. Rich Global Export Service Experience

We serve worldwide construction machinery dealers and maintenance teams. We provide pre-sales part verification and responsive after-sales support, solving compatibility problems promptly and establishing long-term stable cooperative relationships.