1. Introduction
The GSI Creos Air Adjustment Valve PS240 is an accessory designed for airbrushing. It allows you to connect an airbrush, such as the PS-268A, to an air can (e.g., Mr. Air) and precisely control the air output. This manual provides essential information for the safe and effective use of your air adjustment valve.
2. Safety Information
- Important: Only use this product with air cans manufactured by GSI Creos. Using it with other brands of air cans may result in malfunction or injury.
- Keep out of reach of children.
- Store in a cool, dry place away from direct sunlight and heat sources.
3. Product Overview and Components
The GSI Creos Air Adjustment Valve PS240 consists of several key parts that work together to regulate air flow. Understanding these components is crucial for proper assembly and operation.

Figure 1: Component Diagram and Connection Example of the Mr. Air Adjustment Valve.
As shown in Figure 1, the main components include:
- Air Adjustment Screw: Used to control the amount of air released.
- O-ring (Small): Ensures a tight seal within the valve mechanism.
- Mr. Air Adjustment Valve Body: The main unit for air flow regulation.
- O-ring (Large): Provides a seal for the connection to the air can.
The diagram also illustrates the connection points for an airbrush, a PS (fine) hose, a 1/8(S) joint, and a Mr. Air can.
4. Setup Instructions
Follow these steps to set up your GSI Creos Air Adjustment Valve PS240:
- Attach to Air Can: Screw the GSI Creos Air Adjustment Valve onto the top of your GSI Creos Mr. Air can. Ensure it is securely tightened to prevent air leakage.
- Connect Air Hose: Connect a PS (fine) air hose to the appropriate port on the air adjustment valve.
- Connect Airbrush: Attach your airbrush (e.g., PS-268A) to the other end of the PS (fine) air hose, using a 1/8(S) joint if necessary.
- Check Connections: Verify that all connections are firm and secure before proceeding to operation.
5. Operating Instructions
Once the valve is properly set up, you can begin adjusting the air flow:
- Adjust Air Output: Turn the air adjustment screw on the valve to increase or decrease the air flow to your airbrush.
- Test Flow: Before applying paint, test the air flow on a scrap surface to ensure you have the desired pressure and volume.
- Fine-tune: Make small adjustments to the screw as needed during your airbrushing session to maintain optimal performance.
6. Maintenance
Proper maintenance ensures the longevity and reliable performance of your air adjustment valve:
- Regular Inspection: Periodically inspect the O-rings (small and large) for any signs of wear, cracking, or damage.
- O-ring Replacement: If an O-ring is damaged or lost, it must be replaced to prevent air leakage. Replacement O-rings are sold separately.
- Cleaning: Keep the valve clean and free from paint residue or debris. Use a soft, dry cloth for cleaning. Do not use harsh chemicals that could damage the metal or O-rings.
- Storage: When not in use, detach the valve from the air can and store it in a protective container to prevent damage.
7. Troubleshooting
If you encounter issues with your air adjustment valve, consider the following:
- Air Leakage: Check all connections for tightness. Inspect both O-rings for damage or improper seating. Replace O-rings if necessary.
- No Air Flow: Ensure the air can is not empty. Check that the air adjustment screw is not fully closed. Verify that the air hose and airbrush are not clogged.
- Inconsistent Air Flow: This could indicate a partially clogged valve or a worn O-ring. Clean the valve and inspect O-rings.
If problems persist, please contact GSI Creos customer support.
8. Specifications
| Model Number | PS240 |
| Main Material | Metal |
| Battery Use | No |
9. Warranty and Support
For information regarding product warranty, returns, or technical support, please refer to the official GSI Creos website or contact your local retailer. Keep your purchase receipt as proof of purchase.