1. Introduction
This instruction manual provides essential information for the proper installation, operation, and maintenance of the TeeJet 23120-3/4-PP Pressure Relief Valve. Adhering to these guidelines will ensure optimal performance and longevity of the product. Please read this manual thoroughly before using the valve.
2. Safety Information
Warning: Always depressurize the system before attempting any installation, adjustment, or maintenance on the valve. Failure to do so can result in serious injury or equipment damage.
- Wear appropriate personal protective equipment (PPE) when handling the valve and working with pressurized systems.
- Ensure all connections are secure and leak-free before operating the system.
- Do not exceed the maximum operating pressure specified for this valve.
- Consult a qualified professional if you are unsure about any installation or operation procedures.
3. Product Overview
The TeeJet 23120-3/4-PP is a piston-type pressure relief/regulating valve designed to control line pressure by bypassing excess liquid. It features an adjustable design for precise pressure control and is constructed with durable materials for chemical resistance.
Figure 1: TeeJet 23120-3/4-PP Pressure Relief Valve. This image shows the black polypropylene body of the valve with a white adjustment knob at the top. It has a 3/4-inch inlet/outlet connection and a 1/4-inch FPT gauge port.
Key Features:
- Piston-type design for effective pressure regulation.
- Adjustable pressure setting with a secure locknut.
- Extra-large valve passages for handling large flow rates.
- Constructed with a 302 stainless steel spring and EPDM O-ring for chemical resistance.
- Includes a 1/4" port for pressure gauge pipe plug for convenient monitoring.
- Inlet and Pipe Connection: 3/4"
4. Setup and Installation
Proper installation is crucial for the safe and efficient operation of the pressure relief valve. Follow these steps carefully:
- Depressurize System: Ensure the entire system is depressurized and isolated before beginning installation.
- Select Location: Install the valve in a location that allows for easy access for adjustment and maintenance. It is typically installed at the tank return or bypass line.
- Prepare Connections: The valve features 3/4" inlet and pipe connections. Apply appropriate thread sealant (e.g., Teflon tape) to all threaded connections to ensure a leak-free seal.
- Connect Valve: Securely connect the valve to the system piping. Ensure the flow direction is correct, if applicable.
- Install Pressure Gauge (Optional): If desired, install a pressure gauge into the 1/4" FPT gauge port to monitor system pressure. Use appropriate thread sealant.
- Inspect Connections: Visually inspect all connections for tightness and proper alignment.
- Pressurize System: Slowly re-pressurize the system and check for any leaks. Address any leaks immediately before proceeding.
5. Operating Instructions
The TeeJet 23120-3/4-PP valve functions by bypassing excess fluid to maintain a set pressure. It is designed to regulate pressure rather than simply release it and then close completely.
- Initial Pressure Setting: With the system operating, turn the white adjustment knob (visible at the top of the valve in Figure 1) clockwise to increase the set pressure or counter-clockwise to decrease it.
- Monitor Pressure: Use a pressure gauge connected to the 1/4" port to accurately monitor the system pressure while making adjustments.
- Secure Setting: Once the desired operating pressure is achieved, tighten the locknut located beneath the adjustment knob to secure the setting and prevent accidental changes.
- Bypass Function: Understand that this valve will continuously bypass fluid once the set pressure is reached, maintaining that pressure by diverting excess flow. It does not fully close after a pressure spike.
6. Maintenance
Regular maintenance ensures the reliable operation and extends the lifespan of your TeeJet pressure relief valve.
- Regular Inspection: Periodically inspect the valve for any signs of wear, damage, or leaks. Check the integrity of the polypropylene body and connections.
- Cleaning: If the valve is exposed to corrosive chemicals or debris, flush it with clean water after use to prevent buildup and corrosion.
- O-Ring and Spring Check: The valve contains a 302 stainless steel spring and EPDM O-ring. If pressure regulation becomes inconsistent or leaks occur, these components may need inspection or replacement.
- Winter Storage: If the valve is part of a system that will be stored in freezing conditions, ensure all water is drained from the valve and associated plumbing to prevent damage from ice expansion.
- Component Replacement: Use only genuine TeeJet replacement parts for any repairs to ensure compatibility and performance.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Pressure not holding or fluctuating |
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| Leaks from connections |
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| Valve not bypassing excess flow |
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8. Specifications
| Feature | Detail |
|---|---|
| Model Number | 23120-3/4-PP |
| Brand | TeeJet |
| Material | Polypropylene (Exterior), 302 Stainless Steel (Spring), EPDM (O-ring) |
| Inlet Connection Size | 3/4 inches |
| Inlet Connection Type | National Pipe Tapered (NPT) |
| Outlet Connection Size | 3/4 inches |
| Outlet Connection Type | NPT |
| Maximum Operating Pressure | 145 PSI (Pound per Square Inch) |
| Specification Met | 150 PSI |
| Number of Ports | 1 (main flow) + 1 (gauge port) |
| Gauge Port | 1/4" FPT |
| Item Weight | 5.8 ounces |
| Package Dimensions | 6.97 x 3.7 x 2.72 inches |
9. Warranty and Support
For specific warranty information and technical support, please refer to the official TeeJet website or contact TeeJet customer service directly. Keep your purchase receipt as proof of purchase.
Contact Information: Please visit www.teejet.com for the latest contact details and support resources.
