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Test and drain valves are important components in a fire sprinkler system, enabling safe system testing, controlled draining procedures, and compliance with NFPA standards.
At QRFS, we offer a wide selection of UL Listed and FM Approved test and drain valves designed for reliable performance in wet fire sprinkler system applications. Built from durable brass and engineered for precision, these assemblies support accurate water-flow testing and help ensure your system meets NFPA 13 and NFPA 25 requirements.
Whether you're performing annual inspections, verifying a water flow alarm, or draining a system during maintenance, a properly installed inspector's test and drain provides the functionality you need in a compact, PSI-rated solution.
Test and drain valves simulate sprinkler activation by restricting water flow through a calibrated orifice based on a specific K-factor. This process allows contractors to confirm that alarms, pipes, and system components operate correctly without activating the entire system.
Many modern assemblies feature a single-handle ball valve that controls both test and express drain functions. Some models include an integrated pressure relief valve as part of the assembly, helping manage excess pressure within the system, while others are designed without this feature, depending on system requirements. Additional features, such as a sight glass and a tamper-resistant test orifice, improve visibility, safety, and efficiency during tests.
Sprinkler test and drain valves are designed to streamline maintenance while minimizing downtime. Their compact design simplifies installation on system pipe configurations, while integrated drain capabilities allow for efficient system draining without removing additional plugs.
Key features and benefits:
These valves play a vital role in maintaining system integrity and ensuring your fire sprinkler system performs as expected during emergencies.
At QRFS, we make it easy to find the right test and drain valves for your fire protection needs. With a range of sizes, configurations, and trusted brands, our products are built to support safe operation, efficient testing, and long-term reliability.
If you need additional system parts, check out:
Visit the QRFS home page to see our complete selection of fire protection equipment.
What is a test and drain valve used for?
A test and drain valve performs two key functions in a fire sprinkler system: testing system performance and draining water for maintenance. It combines an inspector’s test connection and a drain valve into a single assembly, making it easier to verify water-flow alarms and perform maintenance tasks.
How does a test and drain valve simulate a sprinkler activation?
Test and drain valves use a calibrated orifice that mimics the flow of a single sprinkler head based on its K-factor. When the valve is set to the test position, water flows through this orifice to simulate real sprinkler discharge. This allows technicians to confirm that alarms and flow switches activate properly.
What are the main parts of a test and drain valve?
Typical components include a single-handle ball valve, inlet and outlet connections, a sight glass, a calibrated test orifice, and a plugged access port. Models also include a three-position control (closed, test, and drain). Some valves may also have an optional pressure relief valve integrated into the assembly.
What is the purpose of the sight glass on a test and drain valve?
The sight glass allows users to visually confirm water flow during testing or draining without needing to inspect discharge outside the building. This improves safety and efficiency during inspections. It also helps identify flow issues like blockages or insufficient pressure.
What is the plugged access port on a test and drain valve for?
The 1/2-inch plugged port is designed as a system access point, often used for installing optional components like a pressure relief valve or for hydrostatic testing. It is not intended for installing a gauge to measure residual pressure during a main drain test, as turbulence at that location can lead to inaccurate readings.
Do all test and drain valves include a pressure relief valve?
No, not all test and drain valves include a pressure relief valve. Some models are designed with an integrated pressure relief valve, while others allow one to be added through the access port as needed. This flexibility helps contractors meet specific system requirements.
What are the different operating positions of a test and drain valve?
Most test and drain valves have three positions: closed, test, and drain. The test position restricts flow through the orifice to simulate a sprinkler, while the drain position fully opens the valve for rapid system draining. The closed position stops all water flow through the valve.
How are test and drain valves used during inspections?
During inspections, the valve is used to perform water flow tests and main drain tests required by NFPA 25. Technicians measure system pressure and confirm alarm activation by running water through the valve. These tests help identify issues like supply degradation or faulty alarms.
Why is the orifice size important in a test and drain valve?
The orifice size determines how closely the valve simulates the flow of a specific sprinkler head. It must match the system’s smallest sprinkler K-factor to ensure accurate testing conditions. Using the correct orifice ensures reliable results when verifying system performance.
Can a test and drain valve be used to drain an entire system?
Yes, in the drain position, the valve allows unrestricted water flow to quickly drain a system or a section of piping. This is useful for maintenance, repairs, or system modifications. It also supports the required draining procedures during maintenance and testing.