Check flap valve ARCO 3/4 DN20 (model 190204) — non-return valve for fluid systems

The ARCO flap check valve model 190204 is a 3/4 (DN20) non-return valve designed to prevent reverse flow in fluid systems. Constructed for installation in pipelines with DN20 connections, this valve provides one-way flow control suitable for water distribution, heating circuits and general fluid transport applications. Its compact design is intended for in-line mounting and integration into existing plumbing and mechanical assemblies where backflow prevention is required.

Advantages

The flap design ensures rapid closure in the event of reverse flow, reducing the risk of water hammer and minimizing leakage past the seat. The valve is sized for DN20 pipelines, offering a balance of flow capacity and compact dimensions for tight installations. Materials and internal geometry are selected to provide reliable operation in common water and heating environments and to require minimal maintenance under normal conditions.

Suitable for

• Domestic and commercial water supply lines with DN20 connections
• Heating system circuits where one-way flow is necessary
• Piping systems for general fluid transport that require backflow prevention
• Integration into pump discharge lines or branch runs to prevent reverse flow

Key specifications

• Size: 3/4 (DN20)
• Function: Non-return (check) valve with flap/disc mechanism
• Installation: Inline, for DN20 pipe connections
• Application media: Water and common heating fluids
• Typical uses: Water distribution, heating circuits, pump discharge protection

How to use

Install the valve in the piping with the flow direction matching the arrow on the body so that the flap opens toward the outlet. Ensure correct pipe alignment and secure threaded or fitted connections according to the system's installation standards. After installation, pressurize the line and check for leaks around joints; verify that the valve closes when flow reverses. Routine operational checks can be performed during scheduled maintenance to confirm that the flap moves freely and seals effectively.

Usage recommendations

Use this DN20 flap check valve in systems carrying clean water or compatible heating fluids. Avoid installing the valve where heavy particulate contamination, freezing conditions, or aggressive chemicals are expected unless additional filtration or protection is provided. For reliable performance, follow local plumbing codes during installation and include accessible shut-off points to isolate the valve for inspection or replacement.