Overview: America’s chemical transport companies rely on Midland products for routine safe handling of anhydrous ammonia. No matter what you’re shipping, you can depend on Midland’s market-leading reputation to deliver durable, easy-to-use and safe products that are specifically engineered to withstand the abuse of harsh rail-transport environments with products that exceed industry standards. We also provide the most responsive technical support in the industry backed by innovative engineering designs that can solve even your toughest requirements.

Midland Experience

The experts at Midland Manufacturing design and manufacture high-quality pressure relief valves, loading/unloading angle valves, actuator systems, level measurement gages and other equipment for the anhydrous ammonia industry. Midland is unmatched in design expertise, product offering, quality, support and dedication to customer-focused service. Our products meet, and typically exceed, AAR regulations.

Midland recognizes that it is the responsibility of the shipper to specify the proper railcar valves and fittings for the safe loading, transport and unloading of products under pressure and has designed these components with the shipper in mind.


View Midland’s preferred fittings for Anhydrous Ammonia commodity cars below.








  • Our 2” angle valves feature soft seating for a more consistent and reliable seal
  • The stem packing is adjustable to adapt to the changing conditions in which the valves operate, allowing the valve to last longer in service without issues
  • The Midland pressure relief valve has excellent flow characteristics to meet industry requirements
  • The pressure relief valves are all cap-able with the current Emergency Response Kit
  • The Midland B-612 has been in service for 40 years proving to be reliable and efficient over the long life of the tank car

Advantage (Application-to-Spec)

  • Midland supplies the most complete package for the anhydrous ammonia market including angle valves, check valves, pressure relief valves, thermowells, sample lines and gaging devices
  • All Midland anhydrous ammonia valves are available in a variety of materials of construction to meet customers’ requirements
  • Midland continues develop and improve our various valve families to better meet the needs of the industry
  • Our new NGRTC valve package meets the new regulatory requirements for the transport of TIH and PIH commodities including anhydrous ammonia
  • Multiple materials of construction are available
  • Soft-seated angle valves and check valves for more consistent sealing
  • All primary seals are below the surface of the pressure plate
  • Improved flow rate
  • Pressure relief valve now incorporates a rupture disc to reduce exposure of critical valve components to the commodity
  • Cap-able with the current Emergency Response Kit