Gate valves are linear motion valves designed for on/off isolation, providing an unimpeded straight-through flow path when fully open, resulting in minimal pressure drop. Their design and manufacturing must comply with standards such as API 600 (Cast Steel Gate Valves) or API 602 for smaller, forged valves. Dimensional face-to-face standards are dictated by ASME B16.10. Inspection procedures often include Non-Destructive Examination (NDE) of castings per MSS SP-55, while testing is conducted per API 598 or API 6D, requiring hydrostatic shell tests, low-pressure seat tightness tests, and verification of the backseat seal integrity.