Abstract: A fluid test apparatus for high pressure valves consists of a massive rigid supporting frame having a supporting table portion with an opening for application of fluid pressure to a valve being tested and an end sealing arrangement for sealing one opening to such valve. A pair of fluid operated cylinders are positioned on opposite sides of the supporting table and have extended pistons operable to be retracted upon application of fluid pressure to the cylinders. A clamping bar extends between the ends of the pistons and supports an end closure and seal for closing another opening to the valve being tested. A control system is associated with the apparatus to control the application of fluid pressure to the cylinders to retract the pistons to clamp and seal a valve being tested, and to control the application of fluid pressure to such valve in either open or closed position to test both the valve and the valve body for leakage.