Description

Description

Midland Lead-Free Brass Check Valve (SWT)

Midland Lead-Free Brass Check Valves provide automatic backflow prevention in copper piping systems by allowing flow in one direction and closing when reverse flow occurs.

Manufactured from durable lead-free brass, these inline check valves feature sweat connections on both ends for direct installation into compatible copper tubing and are suitable for potable water, residential, commercial, and light industrial plumbing applications.

Product Highlights

Lead-free brass construction
SWT x SWT solder connections
Designed for copper tubing installations
Automatically prevents reverse flow
Compact inline body design
Suitable for potable water systems
Helps protect pumps, water heaters, fixtures, and equipment
Corrosion-resistant brass body
Available in multiple nominal pipe sizes
Manufactured by Midland Industries

Technical Specifications

Product Type	Check Valve
Brand	Midland
Body Material	Lead-Free Brass
Connection Type	SWT x SWT
Connection Style	Copper Sweat / Solder
Operation	Automatic
Primary Function	Reverse Flow Prevention
Installation Style	Inline
Potable Water Use	Yes
Available Sizes	Multiple Nominal Pipe Sizes
Typical Applications	Potable Water, Residential, Commercial, and Light Industrial Copper Piping Systems

Check Valve Configuration

Sweat Inlet

The solder inlet connects directly to compatible copper tubing using accepted sweat installation practices.

Automatic Check Mechanism

The internal mechanism opens under forward flow and closes automatically when flow reverses.

Sweat Outlet

The opposite solder connection continues the copper piping run to downstream valves, fixtures, equipment, or other components.

Construction Details

Midland Lead-Free Brass Check Valves are constructed from corrosion-resistant lead-free brass for dependable long-term service in compatible copper piping systems.

The internal check mechanism responds automatically to system flow, opening during normal forward flow and closing when reverse flow occurs to help prevent unwanted backflow.

Precision-machined sweat sockets provide secure soldered connections when properly installed with compatible copper tubing.

Why Use a Check Valve?

Automatic Backflow Prevention

Allows flow in one direction
Closes automatically during reverse flow
Helps protect downstream equipment
Requires no manual operation
Useful in many water distribution systems

Copper Piping Compatibility

SWT x SWT connections
Designed for copper tubing
Compact inline installation
Permanent soldered connection
Suitable for compatible potable water systems

Typical Applications

Plumbing & Water Systems

Potable water piping
Residential plumbing
Commercial plumbing
Water distribution systems
Copper supply piping

Equipment Protection

Pumps
Water heaters
Fixtures
Mechanical equipment
Other downstream plumbing components

Flow Direction

Install the valve so system flow follows the directional arrow marked on the valve body.

Correct orientation is required for the internal check mechanism to open during forward flow and close when reverse flow occurs.

Sweat Installation

Use accepted soldering practices with compatible copper tubing and properly prepared valve sockets.

Follow Midland manufacturer recommendations for soldering procedures and avoid excessive heat that could damage internal valve components.

Ask Willy: Need Help Selecting a Sweat Check Valve?

Our plumbing specialists can help review your copper tubing size, flow direction, potable water requirements, pressure, temperature, and installation conditions before you order.

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Frequently Asked Questions

What does a check valve do?

A check valve allows flow in the intended direction and automatically closes when reverse flow occurs.

What material is this valve made from?

It is manufactured from lead-free brass.

What type of connections does it use?

It uses sweat or solder connections on both ends.

What does SWT mean?

SWT refers to a sweat or solder connection used with compatible copper tubing.

Does the valve require manual operation?

No. The internal check mechanism operates automatically in response to flow direction.

Can it be used in potable water systems?

Yes. The supplied product information identifies lead-free construction and suitability for potable water applications.

Does installation direction matter?

Yes. Install the valve so the system flow matches the directional arrow on the valve body.

What components can a check valve help protect?

The supplied product information identifies pumps, water heaters, fixtures, and other downstream plumbing equipment.

Are multiple sizes available?

Yes. The supplied product information identifies multiple nominal pipe sizes.

What should I verify before installation?

Confirm copper tubing size, flow direction, pressure, temperature, media compatibility, soldering requirements, and applicable plumbing codes.

Important Ordering & Installation Notes

This listing is for Midland Lead-Free Brass Check Valves with SWT x SWT connections.
Verify the required nominal pipe size before ordering.
Use only with compatible copper tubing and soldered piping systems.
Install according to the flow-direction arrow marked on the valve body.
Correct flow orientation is required for proper check-valve operation.
Prepare and clean copper tubing and valve sockets before soldering.
Follow accepted soldering practices and Midland manufacturer recommendations.
Avoid excessive heat exposure that could damage internal valve components.
Confirm pressure and temperature requirements before installation.
Verify media compatibility for the intended application.
Support connected piping appropriately to avoid excessive mechanical load.
Allow soldered joints to cool properly before repressurizing the system.
Check completed joints for leakage before normal operation.
Do not install the valve backward against the intended flow direction.
Follow applicable plumbing codes and system requirements.