The DYFJ-F200 valve testing bench is a fourth-generation pressure testing and detection equipment independently developed by Duojia Hydraulics, based on many years of production experience and in accordance with national standards and specifications.
The DYFJ-F200 type valve test bench integrates electromechanical, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums. It features comprehensive functions, stable performance, and a high degree of automation. It is widely used for sealing face leakage testing and shell strength (pore) tests of various high, medium, and low-pressure valves with nominal diameters of 50-200mm, including direct flange, welded, threaded, and clamp-style types. Test media: water, gas, oil.
The equipment is hydraulically driven and electrically controlled throughout the process, exerting no external force on the valves that would affect the test results. This significantly enhances work efficiency and reduces labor intensity, making it the ideal new generation valve pressure testing equipment for valve manufacturing companies, users, and maintenance units.
DYFJ-F200 Type Valve Test Bench Working Principle and Structure
The DYFJ-F200 type valve test bench operates by locating the valve flange face and using a hydraulic cylinder to clamp the flange face, ensuring no external forces affecting the test results, in compliance with national standard valve testing requirements.
The equipment is generally divided into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operating devices.
The equipment features a vertical top pressure design. Both the upper and lower workbenches are sealed with blind flanges. The upper workbench is equipped with an in/out function mechanism, directly driven by a hydraulic cylinder, ensuring even force distribution on the valve sealing surface for reliable tightness. The lower workbench is stationary, featuring bidirectional water intake and drainage. The sealing disc is fitted with drain and vent valves, facilitating the inspection of gas-tightness tests and the observation of the valve sealing surface. It boasts excellent performance and a simple, compact structure.
Operation Instructions
Valve Mounting Method
Select a valve with a nominal diameter that matches the equipment model, turn on the power, and start the hydraulic system. Move the upper cylinder upward until it is longer than the valve being tested. Place the valve flange face against the lower workbench test blind plate, aligning with the center opening. Lower the upper movable frame onto the fixed lower workbench, with the other end of the valve being tested pressed against the lower test blind plate, aligning with the center opening. The valve is in a horizontal position overall.
2. Water Pressure Testing Methods (Double-direction Inflow and Drainage)
After the valve bracket is installed, refer to the "Clamping Cylinder Pressure Chart" to increase the hydraulic clamp force to the required pressure. Adjust the electrical contact pressure gauge (for a 25 kg valve, adjust the gauge pointer to 2.5 MPa). Open the main water inlet, upper and lower water inlet valves, close the air inlet, drain, and vent valves. Start the low-pressure water pump, observe the movement of the water pressure gauge pointer. When the pointer stops rising, it indicates that the valve cavity is fully filled with water. Start the high-pressure water pump; the pump will automatically stop when the water pressure reaches the set pressure on the electrical contact pressure gauge. The equipment then enters the water pressure maintenance state.
Upon reaching the pressure-holding time, there are no issues with the valve. It should first be opened to release the water pressure within the valve chamber, and then the valve can be removed.
3. Pressure Testing Methods (Bi-directional Intake, Exhaust)
The equipment does not come with a gas source. The user must provide a separate gas source. Please consult the manufacturer before using high-pressure gases.
After the valve mounting is complete (for example, using compressed air, typically not exceeding 10 kg), open the water and air intake valves, and close the water and air release valves. Close the water and air intake valves when the pressure gauge reaches the highest pressure, and the equipment is in a pressure-holding state.
Upon reaching the pressure-holding time, the valve shows no issues. First, open the vent valve to release the pressure inside the valve chamber, then remove the valve.
Handling Instructions and Requirements
Ensure the equipment is level during installation or securely fasten the anchor slots with concrete.
2. Choose 46-grade anti-wear hydraulic oil (use anti-freeze 46-grade anti-wear hydraulic oil below 0℃), ensuring the oil level does not fall below the indicator. Regularly check the oil level and hydraulic oil. After one year of use, clean the oil tank and replace the hydraulic oil.
3. Add rust inhibitor to the recirculating water; replace the water promptly when the water quality deteriorates.
4. The equipment work surface should be kept clean, and there should be no debris between the valve flange under test and the pressure test blind plate.
5. All moving parts of the testing bench should be lubricated and kept clean for smooth operation.
6. Operators must undergo professional training before taking up their positions, adhere to standard operations, and prioritize safety.
