Manufacturing Techniques

HyGrade manufacturing technique montage

HY-GRADE check valves are manufactured at our facility in Fairhope, Alabama, USA, using advanced machining technology and computer numerical control (CNC) equipment.

All exterior pressure containing components (bodies and seat inserts) are 100% machined from wrought or centrifugal cast raw materials with no welding or weld repairs to ensure the highest quality.

Quality Program

HY-GRADE maintains a program of continuous quality improvement to assure that our products meet or exceed the standards established by our customers. Our quality management system is certified to ISO 9001 and PED 97/23 EC Module H. In addition, HY-GRADE's quality program has been audited by various international inspection agencies to verify strict compliance of total quality.

In-house hydrostatic testing to API 598 or API 6A ensures the integrity of HY-GRADE check valves. Additional Non-Destructive examinations (Magnetic Particle, Liquid Penetrent, Ultrasonic, or Positive Material Identification) to ASME or API practices are available to meet customer specifications.

Manufacturing TechniquesMake A Difference
HyGrade Cryogenic Testing

In-house cryogenic testing to BS 6364 and/or customer specifications, utilizing a state-of-the-art computer-controlled test station. Cryogenic testing capabilities include Helium or Nitrogen testing down to -320 °F (-196 °C). Additional capabilities include external leakage detection by means of a mass spectrometer with sniffer probe.

HyGrade Cryogenic Test Unit