Valve Bending Moment & Torque Test Bench
In oil and gas, chemical, natural gas and long-distance pipeline projects, valves carry not only the medium pressure but also additional bending moments and torques caused by thermal expansion, foundation settlement and installation misalignment. These external loads directly affect sealing reliability and operational safety. To assess load capacity accurately under real service conditions, Ouxun Intelligent Technology (Taizhou) Co., Ltd. designs and builds the valve bending moment and torque test bench, dedicated to mechanical performance testing of industrial valves under bending, torsion and combined loading.
Applicable Standards and Test Range
The bench verifies sealing, structural strength and open/close operation while the valve is subjected to specified bending moment and torque, in accordance with API 6D, API 598, ISO 10497, GB/T 13927, JB/T 9092 and related specifications. Test objects include gate, globe, ball, butterfly, plug and check valves, with nominal sizes from DN50 to DN1200 (larger sizes available on request). Pressure class and end connection type can be adjusted at the design stage to suit the customer’s product range.
Construction and Working Principle
The bench consists of a load frame, bending moment loading unit, torque loading unit, hydraulic or servo drive system, a high-precision sensor group and the measurement and control unit.
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Load frame: welded from high-strength structural steel and stress-relieved by annealing, with ample rigidity to keep frame deformation minimal under heavy load and ensure accurate load lines.
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Loading system: independent hydraulic or electric cylinders apply controlled force, converted through a loading arm into a pure bending moment at the valve end. Torque is applied by a rotary actuator, geared motor or hydraulic motor directly to the valve flange or stem, simulating torsional load transmitted by the pipeline. Bending moment and torque can be applied independently or proportionally combined to reproduce real conditions.
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Measurement and sensors: spoke-type force sensors, flange-type torque sensors and displacement sensors with accuracy better than class 0.5. Signals feed the control system through a high-precision acquisition module, displaying bending moment, torque and rotation angle in real time, with peak hold and overload protection.
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Control system: industrial PLC with a touchscreen HMI. The operator sets target moment/torque, loading rate and dwell time, and the system completes loading, holding and unloading automatically, recording curves and data and exporting a test report.
Features
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Accurate, stable loading: closed-loop control holds force and torque within ±1%, with good repeatability, meeting the tight loading tolerances required for type testing.
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Comprehensive safety: overload alarm, emergency stop and automatic pressure release when the target load is reached; guards fitted at key load-bearing points to protect operators.
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Wide adaptability: interchangeable interface tooling suits flanged, wafer and welded-end connections, and a combined bending-plus-torque mode can be added on request.
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Simple operation: a clean software interface with clear parameter setting lets one operator run the whole test. Historical data query and curve playback make comparison and analysis easy.
Manufacturing and Service
Ouxun Intelligent Technology (Taizhou) Co., Ltd. is based in Taizhou, Zhejiang, and has long focused on the development and manufacture of mechanical test equipment, pressure test equipment and custom inspection systems. For the valve bending moment and torque test bench, everything from concept design and machining to electrical commissioning is completed in-house, with key components sourced from established domestic and international brands to ensure long-term stability. Delivery includes full technical documentation, on-site installation and commissioning, operator training, and continuing technical support and maintenance.
Whether used for 100% factory inspection at a valve manufacturer or for type testing at a third-party laboratory, this bench delivers reliable data and solid construction to help users hold their quality line. For detailed specifications or custom requirements, please contact our engineering team.