Four Circuit Protection Valve, Sany, A220401000617, Truck Crane

Four Circuit Protection Valve A220401000617 for Sany truck crane

The Sany four circuit protection valve A220401000617 is a critical safety component engineered specifically for Sany truck crane air brake systems. Positioned downstream of the air processing unit and upstream of the individual circuit reservoirs, this valve acts as the central distribution and protection point for the entire pneumatic braking system . It ensures that a catastrophic pressure loss in one circuit cannot drain air from the remaining circuits, allowing the driver to maintain braking capability and bring the vehicle to a controlled stop even when one circuit has suffered a serious failure . This genuine OEM replacement part is designed to meet Sany's original equipment specifications, providing reliable performance and long service life in demanding construction and heavy-lift applications.

Key Features & Benefits

• Multi-Circuit Protection: Independently protects four separate braking circuits, including primary service brake, secondary service brake, spring brake parking circuit, and auxiliary circuits .

• Automatic Fault Isolation: Each protection element closes automatically within milliseconds when pressure in that circuit drops below a critical threshold, isolating the failed circuit and preserving air supply to remaining circuits .

• Controlled Circuit Filling: Manages the order in which circuits fill during system pressure build-up, typically prioritising service brake circuits to restore braking capability as quickly as possible after start-up .

• Integrated Safety Redundancy: Prevents total brake failure by ensuring that a single circuit failure does not compromise the entire braking system .

• OEM Specification: Manufactured to Sany's original equipment standards, ensuring correct opening and closing pressure thresholds, precise port configuration, and direct fitment.

• Durable Construction: Built from high-grade materials to withstand the rigorous conditions of heavy-duty truck crane operation and long-haul applications .

Technical Specifications

Detailed Description

The Sany A220401000617 four circuit protection valve is the central safety hub for the compressed air braking system on Sany truck cranes. Within the air brake system, few components carry more responsibility for overall system safety than this valve . Positioned between the air supply and the vehicle's individual brake circuits, it ensures that each circuit—whether serving the front axle brakes, rear axle brakes, parking brake, or auxiliary functions—is independently protected .

Each protection element within the valve body is calibrated to a specific opening and closing pressure threshold, set in accordance with Sany's braking system design to ensure that circuit filling and protection operate correctly across the full range of system pressures encountered during normal operation . If a line rupture, coupling failure, or severe leak causes pressure in one circuit to drop rapidly, the corresponding protection element closes within milliseconds, isolating the failed circuit and preserving the air supply in all remaining circuits . This precision engineering ensures that braking capacity is maintained, giving the operator sufficient control to bring the vehicle to a controlled stop .

The valve also governs the pressure available to auxiliary air-operated equipment, ensuring correct supply across all connected systems . For Sany truck crane operators, this component is essential for maintaining safe and reliable braking performance during lifting operations and on-road travel.

Compatible Sany Truck Crane Models

This genuine Sany four circuit protection valve A220401000617 is designed as a direct OEM replacement for Sany truck cranes equipped with the standard four-circuit air brake configuration. It is compatible with Sany truck crane models requiring this specific valve specification. For precise fitment verification, please cross-reference your original valve part number or provide your machine's serial number at the time of ordering.

Installation Guidelines

1. Depressurise System: Ensure the air brake system is fully depressurised before beginning any work.

2. Disconnect Air Lines: Carefully disconnect all air lines from the existing valve, noting the port configuration and line routing.

3. Remove Old Valve: Unbolt the existing four circuit protection valve from its chassis mounting position.

4. Clean Mounting Surface: Clean the mounting bracket and surrounding area to remove debris and corrosion.

5. Install New Valve: Position the new Sany A220401000617 valve and secure it to the mounting bracket at the correct torque specification.

6. Reconnect Air Lines: Connect each air line to the corresponding port on the new valve, ensuring connections are secure and correctly routed.

7. Test for Leaks: Restore system pressure and test all connections with soapy water to verify there are no air leaks.

8. Verify Operation: Confirm that all brake circuits are filling correctly and that the valve is operating as specified.