A valve test rig sounds like it needs one motor: build pressure, watch the gauge. Neometrix's Valve Test Rig runs two, on purpose, and the reason says a lot about how pressure testing actually works in practice.
Clamping a valve securely and applying test pressure are two operations that need to happen in sequence, at very different pressures, without interfering with each other. A 7.5 HP motor drives the clamping circuit, regulated to about 25 bar -- enough to hold a valve firmly between the working plates of a 65-ton, 4-pillar vertical press (400 mm stroke) without deforming it. A separate 2 HP motor then drives the loading circuit up to the full 135 bar test rating. Keeping them on independent circuits means clamping force stays fixed regardless of what test pressure is doing, and the system can enforce a simple safety rule in software: no load without clamp engaged first.
The rig covers butterfly and check valves from 2 to 12 inches (DN50-DN300), and it runs two structurally distinct tests rather than one. A shell hydrostatic test checks whether the valve body holds without rupturing. A separate seat leakage test relies on an industrial camera positioned beneath the valve, visually monitoring the body and seat for seepage -- catching a slow seat leak that might not register as a meaningful pressure drop on a gauge within a practical test window. Build quality backs up the measurement: hardened steel clamping pillars for no-flex operation, chrome-plated leak-proof cylinder shafts, and Hydac/Rexroth filtration (20-micron inline, 10-micron return), in line with API 598 and ISO 5208.
Full writeup: https://neometrixgroup.com/products/valve-test-rig
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