How to Replace the N2 ACR Valve on a SITEK / Semitool Spin Rinse Dryer

Replacing N2 ACR Valve

The ACR Valve is a crucial component for nitrogen supply control in SITEK / Semitool / Rhetech Spin Rinse Dryers. This guide walks you through the removal and installation process step by step.

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Check out our full video guide below for a step-by-step demonstration:

Tools You May Need:

• 5/16″ wrench
• Flush cutters
• Pliers or needle-nose pliers
• Teflon tape

1. Disconnect Existing Valve Connections

1. Remove the two caps and ferrules from the branch tee on the valve.
2. Disconnect the quick fittings from the 20 PSI pressure switch.
3. Disconnect the N2 supply line at the bottom of the N2 distribution manifold.
4. Use pliers to carefully remove the soft tubing for the anti-static and labyrinth seal lines.
   If the tubing is too tight, use flush cutters to trim it.

2. Disconnect Solenoid Air Lines

5. Remove the two air lines coming from the solenoid bank.
   These should slide off more easily due to smaller barb sizes.
6. Label or set aside lines to remember orientation.
   For example, keep the top solenoid line physically higher to recall its position.

3. Remove the Old Valve

7. Use a 5/16″ wrench to remove the valve mounting hardware from the process bowl.
8. If needed, unscrew the branch tee or fittings from the removed valve.
   Note: These components do not come with replacement valves, so you will need to transfer them.

4. Prepare the New Valve

9. Apply Teflon tape to all threaded connections (e.g., branch tee, heater cartridge fitting).
10. Install all transferred fittings onto the new valve before reinstallation.

5. Install the New Valve

11. Reconnect the valve bracket to the process bowl and hand-tighten the mounting hardware.
12. Reinstall the air lines:
    • Top barb on the solenoid bank connects to the bottom barb on the valve.
    • Bottom barb on the solenoid bank connects to the top barb on the valve.
13. Reconnect tubing for:
    • Anti-static line
    • Labyrinth seal
14. Reattach the quick-connect fittings to the 20 PSI switch.
15. Reconnect the N2 supply line to the valve and tighten caps and ferrules.

The valve is now reinstalled and ready for use.

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