1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of the Velvac 4 Way Solenoid Valve with Internal Pilot, Model 320181. This valve is designed to electronically control lift axles or suspension dump systems in various automotive applications. Please read this manual thoroughly before installation and use to ensure safe and efficient operation.
Figure 1.1: The Velvac 4 Way Solenoid Valve, Model 320181. This image shows the compact design of the valve with its electrical connector and threaded ports labeled for cylinder, supply, and exhaust connections.
2. Key Features
- Four-Way Spring Return Valve: Designed for precise control of air flow in two directions.
- Internal Pilot Assist: Enhances valve responsiveness and operational efficiency.
- Electronic Operation: Allows for convenient control of lift axles or suspension dump systems via a 12-volt power supply.
- Low Power Consumption: The 12-volt coil uses only 4.8 watts, minimizing electrical load.
- Durable Construction: Manufactured with materials consistent with Velvac's high-quality air accessory valves, ensuring longevity and reliability.
- Operating Pressure: Designed for a normal operating pressure of 100 psi.
3. Specifications
| Attribute | Specification |
|---|---|
| Brand | Velvac |
| Model Number | 320181 |
| Exterior Finish | Machined |
| Inlet Connection Type | Threaded |
| Outlet Connection Type | Threaded |
| Number of Ports | 4 |
| Operating Pressure | 100 psi (Normal) |
| Power Consumption | 12-volt, 4.8 watts |
| Item Weight | 15.2 ounces |
| Package Dimensions | 5 x 4 x 1 inches |
| UPC | 728974167603 |
4. Setup and Installation
Proper installation is crucial for the reliable operation of your Velvac solenoid valve. It is recommended that installation be performed by a qualified technician.
4.1 Safety Precautions
- Always disconnect power and depressurize the air system before beginning installation.
- Wear appropriate personal protective equipment (PPE), including eye protection.
- Ensure the vehicle is securely supported if working underneath.
4.2 Installation Steps
- Mounting: Select a secure, dry location for mounting the valve, away from excessive heat, vibration, and moisture. Use appropriate fasteners to firmly attach the valve to a stable surface.
- Air Line Connections: Connect the air lines to the appropriately labeled ports (Supply, Cylinder 2, Cylinder 4, Exhaust 3, Exhaust 5). Ensure all connections are tight and leak-free. Use thread sealant on all threaded connections.
- Electrical Connections: Connect the 12-volt power supply to the valve's electrical connector. Ensure correct polarity. The valve requires a switched 12-volt power source for activation.
- System Test: Once all connections are made, repressurize the air system and apply power to the valve. Test the functionality of the lift axle or suspension dump system to confirm proper operation and check for any air leaks or electrical malfunctions.
5. Operating Instructions
The Velvac 4 Way Solenoid Valve operates by receiving a 12-volt electrical signal, which energizes the coil and shifts the valve's internal mechanism. This action redirects air pressure to control the connected pneumatic system (e.g., lift axle or suspension dump).
- Activation: Apply 12-volt power to the valve's electrical connector to activate the solenoid.
- Deactivation: Remove the 12-volt power to deactivate the solenoid. The spring return mechanism will return the valve to its default position.
- System Integration: The valve is typically integrated into a vehicle's control system, allowing the driver to operate the connected pneumatic functions from the cabin.
6. Maintenance
Regular maintenance helps ensure the longevity and optimal performance of your solenoid valve.
- Regular Inspection: Periodically inspect the valve and all connections for signs of wear, damage, or air leaks.
- Cleanliness: Keep the valve free from dirt, debris, and moisture. A clean operating environment is essential for pneumatic components.
- Air Quality: Ensure that the air supply to the valve is clean and dry. Contaminants in the air system can lead to premature wear and malfunction.
- Electrical Connections: Check electrical connections for corrosion or looseness. Ensure the wiring is intact and properly insulated.
- Replacement: If the valve shows signs of significant wear, damage, or consistent malfunction, it should be replaced with an authentic Velvac replacement part.
7. Troubleshooting
If you encounter issues with your Velvac 4 Way Solenoid Valve, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Valve does not activate | No 12-volt power supply; Faulty electrical connection; Damaged coil | Check power source and fuse; Inspect and secure electrical connections; Test coil continuity, replace valve if necessary. |
| Air leak around valve | Loose air line connections; Damaged seals or O-rings | Tighten air line fittings; Inspect and replace seals/O-rings if damaged. |
| Valve operates sluggishly or inconsistently | Low air pressure; Contaminated air supply; Internal valve obstruction | Verify system air pressure; Check air dryer/filter; Disassemble and clean valve (if serviceable) or replace. |
If troubleshooting steps do not resolve the issue, contact Velvac customer support or a certified service technician.
8. Warranty and Support
Velvac products are manufactured to high standards and are backed by a manufacturer's warranty. For specific warranty terms and conditions, please refer to the documentation provided with your purchase or visit the official Velvac website.
For technical assistance, replacement parts, or further inquiries, please contact Velvac customer support:
- Website: www.velvac.com
- Contact Information: Refer to the 'Contact Us' section on the Velvac website for phone numbers and email support.
Figure 8.1: The official Velvac company logo, representing quality and reliability in automotive components.