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This research evaluated using composites and plastics as components in a new design of a high pressure relief valve. The relief valve was tested to pressures of 3000 psi. All components of the relief valve were manufactured from either composites or plastics with the exception of the compression spring. The body was constructed of composite cylinder tubing and was assembled with a tie-rod cylinder design allowing prototype flexibility. Fiberglass rods have been chosen for the tie rods and Nylon 6/6 was used for the cap ends, poppet, and spring holder. The relief valve was tested for dynamics and performance at various pressures ranging from 200 psi to 3000 psi. Deformation and cavitation were reported for each individual component of the valve.