Drain Valve for Air Distribution Manifold

Product Specifications

Technical details and manufacturing context for Drain Valve (optional)

Definition

A drain valve is an optional component of an air distribution manifold designed to facilitate the removal of condensate, moisture, or other liquids that may accumulate within the manifold or connected pneumatic lines. It ensures system efficiency and prevents corrosion or contamination by allowing periodic or manual drainage. The valve is typically installed at the lowest point of the manifold to take advantage of gravity. It can be operated manually or automatically, depending on the design. When opened, it creates a passageway for liquids to exit, driven by gravity or system pressure. After drainage, the valve is closed to restore system integrity and pressure. The valve is available in materials such as brass, stainless steel, or plastic (e.g., nylon), and the connection thread size is specified in millimeters (e.g., 1/4" NPT, G1/8). These specifications must be confirmed with the manufacturer for the specific model and application. The drain valve is not a standard component and is offered as an option. It is essential to verify the compatibility of the valve with the manifold's pressure rating, fluid type, and environmental conditions. Regular maintenance includes checking for leaks, ensuring the valve opens and closes properly, and cleaning any debris that may obstruct the drainage path. If the valve fails to operate or shows signs of wear, it should be replaced promptly to avoid system damage. Always consult the manufacturer's documentation for installation, operation, and maintenance guidelines.

Working Principle

The valve operates by opening a passageway from the manifold's low point to the exterior. When opened manually or automatically, pressure differential or gravity allows accumulated liquid to drain out, after which the valve is closed to restore system integrity and pressure. The valve may be a simple ball valve, a needle valve, or an automatic float-type drain. In manual operation, an operator turns a handle or knob to open the valve. In automatic operation, a float mechanism or solenoid opens the valve when liquid reaches a certain level. The drainage process relies on the pressure inside the manifold to push the liquid out, or on gravity if the manifold is depressurized. After drainage, the valve is closed to prevent air loss and maintain system pressure.

Common Materials

Brass, Stainless Steel, Plastic (e.g., Nylon)

Technical Parameters

What to specify in your RFQ

Connection thread size (e.g., 1/4" NPT, G1/8) in mm

These are the quantities to specify to the manufacturer when sizing or requesting a quote. The manufacturer's own documentation governs the exact figures and applicable standard.

Components / BOM

Valve Body
Main housing that connects to the manifold and contains internal mechanisms

Material: Brass or Stainless Steel
Drain Port Part
Outlet for expelled liquids, often with a threaded connection for a hose

Material: Same as body
Seal/O-ring Part
Ensures leak-proof closure when valve is shut

Material: NBR, FKM, or EPDM
Handle or Knob Optional
What the operator turns to open the drain on manual versions.
Float or Solenoid Optional
Opens the drain by itself when liquid collects, on automatic versions.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Air Distribution Manifold

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the purpose of a drain valve on an air distribution manifold?

The drain valve is used to remove accumulated condensate, moisture, or other liquids from the manifold or connected pneumatic lines. This helps maintain system efficiency and prevents corrosion or contamination.

What materials are available for the drain valve?

The drain valve can be made of brass, stainless steel, or plastic (e.g., nylon). The choice of material depends on the application requirements, such as pressure, temperature, and compatibility with the fluids.

How do I determine the correct connection thread size for the drain valve?

The connection thread size is specified in millimeters (e.g., 1/4" NPT, G1/8). You must verify the correct size for your specific manifold model and application by consulting the manufacturer's specifications.

Is the drain valve included as a standard component?

No, the drain valve is an optional component. It is not included as standard and must be specified when ordering the air distribution manifold.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	0 to 10 bar (150 psi)
flow rate:	0.5 to 5 L/min
temperature:	-20°C to 120°C
slurry concentration:	Up to 5% solids by weight

Drain Valve (optional)

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