Watts Premier RK 709-RT Backflow Repair Kit User Manual

1. Introduction

This user manual provides essential information for the Watts Premier RK 709-RT Backflow Complete Rubber Repair Kit. This kit is designed to facilitate the maintenance and repair of Series 709 Double Check Valve Assemblies, which are critical components in preventing the reverse flow of non-potable water into the potable water supply system. Proper installation and maintenance of these components are vital for ensuring water safety and system integrity.

The RK 709-RT kit contains high-quality rubber components necessary for restoring the functionality of your backflow prevention device. It is intended for use by qualified personnel familiar with plumbing systems and backflow prevention device maintenance.

2. Product Contents

The Watts Premier RK 709-RT Backflow Complete Rubber Repair Kit typically includes the following components:

• Diaphragm
• Disc Assembly (typically two for a double check valve)
• Seat O-ring
• Cover O-ring
• Additional O-rings as required for the specific Series 709 model.

Figure 2.1: Components of the RK 709-RT Repair Kit. This image displays the essential components included in the Watts Premier RK 709-RT Backflow Repair Kit. Visible are two disc assemblies, characterized by their metallic and red rubber construction, alongside several black rubber O-rings of varying sizes. These parts are crucial for maintaining the integrity and function of Series 709 backflow prevention valves.

3. Installation / Replacement Procedure

This kit is designed for the replacement of worn or damaged rubber components within a Watts Series 709 Double Check Valve Assembly. It is highly recommended that installation be performed by a certified backflow prevention device tester or a qualified plumber.

3.1 Safety Precautions

• Always shut off the water supply to the backflow prevention device before beginning any work.
• Depressurize the system by opening test cocks or downstream valves.
• Wear appropriate personal protective equipment (PPE), such as gloves and eye protection.
• Be aware of potential water discharge during disassembly.

3.2 General Replacement Steps

1. Isolate the Device: Close the upstream and downstream shut-off valves to the backflow prevention assembly.
2. Depressurize: Open the test cocks to relieve any trapped pressure within the device.
3. Disassemble: Carefully remove the cover and access the internal components. Note the orientation and position of all parts as you remove them.
4. Remove Old Parts: Extract the old diaphragm, disc assemblies, seat O-rings, and cover O-rings. Inspect the internal surfaces of the valve body for any debris or damage.
5. Clean: Thoroughly clean the interior of the valve body and any reusable components.
6. Install New Parts: Install the new rubber components from the RK 709-RT kit. Ensure all O-rings are properly seated and lubricated with a potable water-approved lubricant if necessary. The disc assemblies and diaphragm must be installed in the correct orientation as per the original valve's design.
7. Reassemble: Carefully reassemble the valve, ensuring all bolts and fasteners are tightened according to the manufacturer's specifications for the Series 709 valve.
8. Test: Slowly open the upstream and then the downstream shut-off valves. Conduct a full operational test of the backflow prevention device as required by local regulations and manufacturer guidelines. This typically involves a certified backflow tester.

Note: No special tools are required for changing these parts, however, standard plumbing tools may be needed for disassembly and reassembly of the valve body itself. Always refer to the specific installation and maintenance manual for your Watts Series 709 Double Check Valve Assembly for detailed instructions.

4. Operating Principles (of the device this kit repairs)

The Watts Premier RK 709-RT kit provides replacement parts for a Double Check Valve Assembly (DCVA). A DCVA consists of two independently operating, spring-loaded check valves installed in series. Its primary function is to prevent backflow (the undesirable reversal of flow of water or mixtures of water and other liquids, gases, or other substances into the potable water supply) in non-health hazard applications.

• Normal Flow: During normal water flow, both check valves are pushed open by the water pressure, allowing water to pass through.
• Backpressure Backflow: If downstream pressure exceeds upstream pressure, the check valves close, preventing water from flowing backward.
• Backsiphonage: If upstream pressure drops (e.g., due to a main break), the spring-loaded check valves close to prevent a vacuum from siphoning contaminated water back into the supply.

The rubber components in this kit are essential for the proper sealing and operation of these check valves.

5. Maintenance

Regular maintenance and testing of backflow prevention devices are mandated by local plumbing codes and water authorities. While this kit provides replacement parts, it is crucial to adhere to a scheduled maintenance program for the entire backflow assembly.

• Annual Testing: Backflow prevention devices, including those repaired with this kit, typically require annual testing by a certified backflow prevention device tester.
• Visual Inspection: Periodically inspect the exterior of the device for leaks, corrosion, or physical damage.
• Component Replacement: Replace rubber components (diaphragms, O-rings, disc assemblies) as needed, especially if the device fails its annual test or shows signs of wear. This kit is specifically designed for such replacements.
• Winterization: In cold climates, ensure the backflow device is properly insulated or drained to prevent freezing and damage.

6. Troubleshooting

Troubleshooting issues with a backflow prevention device often requires specialized knowledge and testing equipment. However, common problems that might necessitate the use of this repair kit include:

• Constant Leakage from Test Cocks: This can indicate a faulty check valve, often due to worn or damaged rubber components (discs, O-rings, diaphragms) or debris lodged in the valve seat. Replacing the rubber parts with this kit can resolve this.
• Failure During Annual Test: If the device fails its required annual test, it almost always points to internal component failure, frequently involving the rubber seals or disc assemblies. The RK 709-RT kit is designed to address these failures.
• Reduced Flow/Pressure: While less common for rubber component failure, a severely damaged or misaligned disc assembly could potentially impede flow.

If you experience any of these issues, it is recommended to contact a certified backflow prevention device specialist for diagnosis and repair. Attempting repairs without proper knowledge can compromise the device's effectiveness and water safety.

7. Specifications

8. Warranty and Support

Specific warranty information for the Watts Premier RK 709-RT Backflow Complete Rubber Repair Kit should be obtained directly from Watts Premier or the authorized seller at the time of purchase. Generally, repair kits are covered against manufacturing defects.

For technical support, detailed product information, or to inquire about warranty claims, please contact Watts Premier directly or visit their official website. You can also visit the Watts Premier Store on Amazon for more information.