SUN Hydraulic cartridge valve CWCA LIV
2 month ago
Product details
The SUN Hydraulic Cartridge Valve CWCA-LIV is a high-performance hydraulic threaded cartridge valve produced by SUN Hydraulics. It is primarily used for pressure, flow, and directional control in hydraulic systems.
Product Features
1. Floating Structure: The SUN Hydraulic cartridge valve employs a free-floating design at the valve tail end, reducing sensitivity to installation torque and preventing jamming. This ensures that internal components can flexibly move within the valve body, enhancing reliability.
2. Wear-Resistant and Fatigue-Resistant Components: The internal components are heat-treated to provide wear resistance, impact resistance, and fatigue resistance, extending the service life.
3. High-Precision Machining: The cartridge hole design incorporates threaded centering, eccentricity compensation, and load dispersion technologies, supporting working pressures up to 350 bar and a wide range of flow rates.
4. Sealing Material: Some models are equipped with EPDM seals, making them suitable for phosphate ester hydraulic oil systems and providing excellent corrosion resistance.
Technical Specifications
• Working Pressure: Supports up to 350 bar (some models can reach 5000 psi).
• Flow Range: Depending on the model, the flow range varies from tens of liters per minute to hundreds of liters per minute.
• Applicable Temperature Range: Typically from -20°C to 80°C.
• Medium Viscosity: Suitable viscosity range is generally between 15 and 400 mm²/s.
• Leakage Class: Low, ensuring system efficiency.
Application Areas
The SUN Hydraulic Cartridge Valve CWCA-LIV is widely used in the following fields:
• Construction Machinery: Such as excavators, loaders, and cranes.
• Marine Industry: Used in marine power systems and hydraulic installations.
• Industrial Hydraulic Systems: Applicable to various industrial machinery and equipment.
• Petroleum Equipment: Plays an important role in oil extraction and processing equipment.
Model Identification and Configuration
• Model Code: The model code of SUN Hydraulic cartridge valves typically consists of multiple parts indicating the valve type, function, sealing material, etc. For example, in CWCA-LIV, "CWCA" may represent the valve type and series, while "LIV" may relate to specific functions or configurations.
• Suffix Identification: Some models use suffixes to distinguish special functions or materials, such as "/AP" indicating an anti-corrosion model.
Maintenance and Installation
• Installation Torque: The installation torque varies depending on the model and should be carried out according to the specified torque in the product manual.
• Maintenance Methods: Include disassembly and cleaning, part selection and matching, and electro-coating repair techniques. Regular maintenance ensures long-term stable operation of the valve.
SUN Hydraulic Cartridge Valve CWCA-LIV Technical Specification
1. Model Breakdown: CWCA-LIV
- CW: Counterbalance Valve Series
- C: Rated flow: 60 L/min, fits T-21A cavity
- A: Pilot ratio: 3:1
- L: Screw adjustable setting
- I: Pressure adjustment range: 25–105 bar (360–1500 psi)
- V: Viton fluorocarbon seal
2. Core Technical Data
- Max working pressure: 280 bar (4000 psi)
- Rated flow: 60 L/min
- Standard cavity: T-21A
- Weight: approx. 0.19 kg
- Installation torque: 41–47 Nm (30–35 lbf·ft)
- Operating temperature: -20℃ ~ +120℃ (Viton seal version)
3. Port Definition (4-port design)
- Port 1 (Load): Connect to hydraulic cylinder / hydraulic motor
- Port 2 (Main valve): Connect to directional control valve working port
- Port 3 (External pilot): External pilot pressure supply with 3:1 pilot reduction ratio
- Port 4 (External drain): Spring chamber drains directly to tank to eliminate backpressure interference
4. Operating Principle
1. Free flow (Port 2 → Port 1): Internal check valve opens for unrestricted fluid feeding to load.
2. Counterbalance / relief mode (Port 1 → Port 2): Main poppet opens when load pressure exceeds preset value to prevent load free-fall and over-speed. Pilot pressure at Port 3 reduces cracking pressure at a 3:1 ratio.
3. External drain via Port 4: Independent spring chamber drain isolates setting from backpressure on Port 2 for stable regulation.
5. Key Features
- Recommended setting pressure: ≥1.3 times maximum working load pressure
- Adjustment instruction: Clockwise = lower setting pressure; Counter-clockwise = raise setting pressure; fully clockwise ≈14 bar minimum cracking pressure
- Reset characteristic: Reseal at ≥85% of set pressure for tight shutoff
- Floating construction minimizes torque sensitivity and prevents valve sticking
6. Typical Applications
Construction machinery: Crane, excavator, loader (prevent boom/bucket runaway drop);
Aerial work platform & lifting equipment (load balancing & speed limiting);
Hydraulic motor circuits (inertia load anti-runaway protection)
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