SJ Gate Valves Pass Rigorous Hydrostatic Testing Ensuring Product Safety and Reliability
SJ Gate Valves Pass Rigorous Hydrostatic Testing Ensuring Product Safety and Reliability
SJ Gate Valves Pass Rigorous Hydrostatic Testing, Ensuring Product Safety and Reliability
Recently, a batch of high-quality SJ brand gate valves underwent the most critical quality inspection before leaving the factory—a high-standard hydrostatic pressure testing. This measure aims to comprehensively verify the products' pressure-bearing strength and sealing performance, ensuring their safety and reliability in future industrial applications.
The pressure testing procedure strictly adheres to national and industry standards, primarily encompassing two major aspects: strength testing and sealing performance testing.
1. Valve Body Strength and Pressure-Bearing Verification
During the test, the gate valve is securely mounted on a dedicated hydraulic testing bench and injected with the test medium. The system gradually applies test pressure significantly exceeding the working pressure to the valve cavity, simulating extreme operating conditions. Test personnel meticulously inspect the valve body, flange connections, and other main pressure-bearing structures to ensure that the valve body exhibits no structural deformation or visible leakage under sustained high pressure. This step thoroughly validates the reliability of the valve's material and casting process.
2. Critical Component Sealing Performance Inspection
Sealing performance is the core indicator of gate valve quality. The test pressure is maintained at a constant level, with the stabilization time meeting standard requirements. Test personnel focus on inspecting the valve seat sealing surface, valve stem packing gland, and the bolted connections between the bonnet and the body. In the underwater immersion test, the valve is operated to open and close. Any minute leakage, even a tiny bubble escaping, will result in test failure. This stringent inspection ensures that the valve can completely shut off the fluid flow in actual operation, achieving zero leakage or meeting the minimum permissible leakage rate standard.
3. Mechanical Operation Performance Testing
In addition, the test also includes dynamic testing of the valve's operating mechanism. Driven by the handwheel, the vertical movement of the valve stem and the action of the gate must be smooth and steady. This inspection verifies the mechanical properties of the valve stem threads, yoke, and transmission components, ensuring the valve can be reliably and conveniently operated even under pressurized conditions.
By mandating pressure testing as a prerequisite for leaving the factory, the SJ brand achieves ultimate quality control over every product. Only gate valves that fully pass all rigorous test indicators are issued a certificate of conformity and delivered to customers for use. This not only demonstrates accountability for the product but also represents a solemn guarantee for industrial production safety and the stable operation of pipeline systems.
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