1. Introduction
This manual provides essential information for the installation, operation, and maintenance of your Rain Bird DASASVF075 Professional Grade Anti-Siphon Valve. This valve is designed for above-ground irrigation systems and helps prevent backflow into your clean water supply. Please read these instructions carefully before proceeding with installation or operation.
2. Safety Information
- Always turn off the main water supply to the irrigation system before performing any installation or maintenance.
- Ensure the valve is installed at least 6 inches above the highest sprinkler head on the valve line to prevent backflow.
- Never install another valve further down the line from the main anti-siphon valve.
- For flows below 3 GPM or Drip applications, install a 200 mesh filter before the valve.
- Operating Pressure: 15 to 150 psi.
- This valve is for outdoor use only.
3. Product Overview
The Rain Bird DASASVF075 is a professional-grade 3/4-inch anti-siphon valve with flow control, compatible with any standard 24-volt AC sprinkler timer. It features a unique reverse-flow design to prevent flooding in case of internal diaphragm failure.
Figure 1: Rain Bird DASASVF075 Anti-Siphon Valve
Key Features:
- Professional Grade: 3/4" anti-siphon valve with flow control.
- Backflow Prevention: Designed for above-ground installation, prevents backflow when properly installed 6" above the highest sprinkler head.
- Operation: Operates automatically or manually with a manual bleed screw.
- Reverse Flow Design: Reduces stress on the diaphragm for dependable operation.
- Energy Efficient: Low power encapsulated solenoid with captured plunger.
- Durable Diaphragm: Buna-N diaphragm provides superior performance in harsh water environments.
- Flow Range: 0.2 to 22 GPM.
Components:
Figure 2: Diagram of Anti-Siphon Valve Components (Solenoid, Flow Control, Bleed Screw, Body, Inlet, Outlet)
- Solenoid: The electrical component that opens and closes the valve when signaled by the irrigation controller.
- Flow Control Knob: Allows adjustment of water flow to optimize sprinkler performance.
- Bleed Screw: Used for manual operation and flushing the system.
- Body: The main housing of the valve.
- Inlet: Where water enters the valve (3/4" Female Iron Pipe Threaded).
- Outlet: Where water exits the valve (3/4" FNPT).
4. Installation
Proper installation is crucial for the anti-siphon valve to function correctly and prevent backflow. Refer to local plumbing codes for specific requirements.
Pre-Installation Steps:
- Turn off the main water supply to your irrigation system.
- Ensure the installation location allows the valve to be at least 6 inches above the highest sprinkler head in the zone it controls.
- Gather necessary tools and materials (e.g., pipe thread sealant, wrenches, PVC cement if applicable).
Installation Procedure:
- Connect Inlet and Outlet: Thread the valve onto the supply line (inlet) and connect the irrigation zone piping to the outlet. Use appropriate thread sealant for a watertight connection.
- Positioning: Ensure the valve is oriented correctly with the flow arrow pointing in the direction of water flow towards the sprinklers. The valve must be installed vertically.
- Wiring: Connect the two wires from the valve's solenoid to your 24 VAC irrigation timer/controller. Typically, one wire connects to the common terminal and the other to the zone terminal.
- Flush System: After installation and before initial startup, manually flush the system of dirt and debris using the valve's external bleed screw. This prevents debris from interfering with valve operation.
Figure 3: Anti-Siphon Valve installed above ground in an irrigation system.
Video 1: Official Rain Bird video demonstrating the installation process for an Anti-Siphon Valve.
5. Operation
The Rain Bird DASASVF075 valve can be operated automatically via an irrigation controller or manually.
Automatic Operation:
When connected to a 24 VAC irrigation controller, the valve will open and close according to the programmed schedule. The controller sends an electrical signal to the solenoid, which then actuates the valve.
Manual Operation:
To manually open the valve, slowly turn the solenoid 90 degrees counter-clockwise (approximately a quarter turn). You should hear water rushing through the valve. To close the valve, turn the solenoid clockwise until it is hand-tight. Water flow will stop after a few moments.
Video 2: Official Rain Bird video demonstrating manual on/off operation for valve models.
Flow Control Adjustment:
The top-mounted, easy-turn flow control knob allows you to adjust the water flow to the zone, optimizing sprinkler performance and avoiding misting. Turn the flow control stem clockwise to decrease flow and counter-clockwise to increase flow.
Video 3: Official Rain Bird video explaining how to use the bleed screw for flushing and manual operation.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your anti-siphon valve.
Diaphragm Replacement:
The valve features a Buna-N diaphragm with a water filter and captive spring. If the valve is not operating correctly or shows signs of leakage, the diaphragm may need inspection or replacement. Replacement kits are available from Rain Bird.
Figure 4: Replacing the diaphragm in an irrigation valve.
Video 4: Official Rain Bird video demonstrating how to replace the diaphragm in a valve.
Flushing the System:
Periodically, or after any pipe work, flush the system manually using the bleed screw to clear any accumulated dirt or debris that could affect valve performance.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Valve does not open automatically. | No electrical signal from controller, faulty solenoid, or debris in valve. | Check controller programming and wiring. Inspect solenoid for damage. Manually flush the valve using the bleed screw. |
| Valve does not close completely. | Debris in valve, worn diaphragm, or faulty solenoid. | Manually flush the valve. Inspect and replace diaphragm if worn. Check solenoid. |
| Water misting or throwing too far. | Water pressure too high. | Adjust the flow control knob clockwise to decrease water flow. Consider a pressure regulator if problem persists. |
| Sprinklers not watering properly (short throw). | Water pressure too low. | Adjust the flow control knob counter-clockwise to increase water flow. Check for blockages in the system. |
| Leakage from the valve. | Loose connections, damaged diaphragm, or cracked housing. | Tighten connections. Inspect and replace diaphragm. If housing is cracked, replace the valve. |
8. Specifications
- Material: Plastic
- Brand: Rain Bird
- Model Number: DASASVF075
- Item Dimensions (L x W x H): 3.25 x 6.88 x 6.5 inches
- Exterior Finish: Stainless Steel (referring to screws)
- Inlet Connection Size: 0.75 inches
- Inlet Connection Type: Female Iron Pipe Threaded
- Outlet Connection Type: FNPT
- Number of Ports: 2
- Outlet Connection Size: 0.75 inches
- Specification Met: CSA, IAPMO
- Unit Count: 2 Count (as per product listing, may vary by package)
- Item Weight: 3.68 ounces
- Manufacturer Part Number: DASASVF075
- UPC: 077985606107
- Included Components: Unit, Instruction Guide
- Thread Size: 3/4 inches
- Thread Type: Female Iron Pipe Threaded
- Connector Type: Threaded
- Valve Type: Anti-Siphon Valve
- Flow Range: 0.2 to 22 GPM
- Operating Pressure: 15 to 150 psi
9. Warranty & Support
Rain Bird products are manufactured to high-quality standards and come with a manufacturer's warranty. For specific warranty details, please refer to the documentation included with your product or visit the official Rain Bird website.
For technical support, troubleshooting assistance, or to inquire about replacement parts, please contact Rain Bird customer service. Contact information can typically be found on the product packaging or the official Rain Bird website.