NH3 Excess Flow & Back Check Valves

Reliable NH₃ Excess Flow & Back Check Valve Components

Our selection includes excess flow valves, back check valves, and supporting components from trusted manufacturers such as Squibb-Taylor and Continental NH3. These products are engineered for liquid NH₃ service and designed to perform reliably under demanding conditions.

Excess Flow Check Valves for Anhydrous Ammonia (NH₃)

Excess flow valves are designed to automatically restrict ammonia flow if it exceeds a safe rate, such as during a hose failure or line rupture.

Available options include:

• 45 GPM, 50 GPM, and 60 GPM flow ratings
• Common 1-1/4" and 1-1/2" MPT and FPT connections
• Proven designs suitable for liquid NH₃ service

Excess flow ammonia check valves are commonly fitted:

• On liquid withdrawal outlets from ammonia tanks
• In liquid transfer lines supplying applicators or nurse tanks
• At the start of hose assemblies, where rupture risk is highest
• Downstream of manual shutoff valves to provide automatic protection
• In systems where liquid NH₃ is transferred under pressure

NH₃ Back Check Valves

Back check valves are used to prevent the reverse flow of liquid ammonia within a system to maintain correct flow direction and system stability.

Available configurations include:

• Full-port swing check designs
• 1-1/4" and 1-1/2" FPT and MPT connection options
• Heavy-duty construction for ammonia compatibility

NH₃ back check valves are commonly fitted:

• In liquid transfer lines, to prevent backflow
• Downstream of excess flow valves for layered protection
• On manifold outlets and distribution lines
• Before applicators or metering equipment
• In systems where reverse flow could cause pressure or contamination issues

To ensure proper installation, protection, and ongoing maintenance of NH₃ valve assemblies, we supply ACME strainer screens, Snap rings, and replacement components

Trusted Ammonia Check Valves From Mid-South Ag

Well-trusted since 1985, we’ve built our reputation on reliability, expertise, and value. With over forty years of experience, our team offers expert guidance backed by super-fast express delivery* and consistently competitive pricing, so you get the right products, quickly, and at unbeatable value.

When working with anhydrous ammonia, protecting your system is essential. Mid-South Ag supplies reliable NH₃ components designed to support safe, compliant operation in real-world environments.

If you need help confirming whether a hydrostatic ammonia relief valve is required in your system, our team can provide guidance based on your application and layout.

Need help or can't find what you're looking for? Speak to our team today.