Brass Drain Valve for HVAC and Plumbing Systems | DN20 Manifold Drain Valve

Product Overview

The brass drain valve is a compact and reliable component designed for draining water from HVAC systems, underfloor heating manifolds, and plumbing pipelines. It allows controlled discharge of liquid from the system, making maintenance and seasonal servicing easier and safer.

This type of drain valve is widely used at the lowest point of a pipeline or manifold to ensure complete system drainage when required.

Working Principle

The drain valve operates through a simple manual control mechanism. By loosening or rotating the knob, the internal sealing structure opens, allowing water or fluid to discharge through the outlet.

When closed, the O-ring sealing system ensures a tight, leak-free connection, preventing unwanted fluid loss during system operation.

The protective cap helps prevent accidental opening and protects the outlet from dust or debris.

Key Features

• Compact manual drain valve design

• Durable brass or nickel-plated brass body (Hpb59-1 material option)

• High sealing performance with O-ring structure

• Protective dust cap for safe operation

• Easy installation on manifold or pipeline end points

• Corrosion-resistant and long service life

Technical Specifications

• Type: Drain Valve / Drainage Valve

• Material: Hpb59-1 brass (nickel-plated optional)

• Connection: Male threaded outlet (BSP / NPT available)

• Working Pressure: ≤ 1.6 MPa

• Working Temperature: -10°C to 120°C

• Application Size Compatibility: DN20 manifold systems (typical use)

Applications

This drain valve is suitable for a wide range of fluid control systems, including:

• Underfloor heating manifolds

• HVAC piping systems

• Radiator heating networks

• Water distribution pipelines

• Boiler and pump drainage points

It is especially useful in systems that require periodic maintenance or seasonal water removal.

Advantages

Compared with traditional drainage plugs, this drain valve offers:

• Easier and faster draining operation

• Better sealing performance

• Reusable and maintenance-friendly structure

• Reduced risk of leakage

• Safer operation with protective cap design

Conclusion

The brass drain valve is an essential component in modern HVAC and plumbing systems. Its compact design, reliable sealing, and easy manual operation make it ideal for system drainage, maintenance, and safety control.