Check valve Herz RL-5 1/2 x 3/4" model 1374801

The Herz RL-5 check valve model 1374801 is a compact non-return valve designed to prevent backflow in heating and plumbing systems. With inlet and outlet thread sizes of 1/2" and 3/4" respectively, it enables reliable unidirectional flow between mismatched threaded connections. The valve is intended for integration into domestic and light commercial installations where protection against reverse flow and system contamination is required.

Advantages

The valve provides dependable backflow prevention in a small, robust housing suitable for tight installation spaces. Its threaded connections allow straightforward mechanical integration without adapting pipework, and the design minimises pressure drop while maintaining flow integrity. Made by a recognised manufacturer of HVAC and plumbing components, the product is engineered for longevity and routine maintenance compatibility.

Suitable for

• Preventing reverse flow in domestic heating circuits
• Protecting hot water and cold water lines from backflow
• Use in small commercial plumbing where different thread sizes must be connected
• Applications requiring a compact non-return valve for retrofit or new installations

Key specifications

• Connection sizes: 1/2" × 3/4" threaded
• Function: non-return (check) valve to allow unidirectional fluid flow
• Typical application: heating and plumbing systems
• Compact body suitable for limited-space installations
• Material and finish suitable for potable water and heating circuits (manufacturer standard)

How to use

Install the valve in the pipe run with the arrow or flow direction pointing toward the outlet to ensure correct unidirectional operation. Use appropriate sealing tape or thread sealant on the threaded connections and tighten to the manufacturer's recommended torque to avoid leaks or thread damage. The valve should be mounted where it remains accessible for inspection and possible maintenance. Do not install the valve in locations where debris or heavy particulate matter can enter without adequate filtration.

Usage recommendations

Verify system compatibility before installation, including temperature and pressure ratings of the surrounding system components. Where necessary, fit strainers or filters upstream to protect the valve from sediment. Periodic inspection during routine system servicing will help maintain reliable operation.