Product Description: The DYFJ-AIOO type valve testing bench is the fourth-generation pressure testing and inspection equipment developed independently by Multiplus Hydraulics on the basis of many years of production experience, in accordance with national standards and specifications.
The DYFJ-AIOO valve test bench integrates mechanical and electrical systems, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums. It features complete functions, stable performance, and high levels of automation. It is widely used for the leakage testing of sealing surfaces and shell strength (pores) on various high, medium, and low-pressure valves with nominal bore diameters of 15-100mm, in straight-through flanged designs. Test mediums: water, gas, oil.
The equipment is hydraulically driven and electrically controlled throughout the process, exerting no external force on the valves that would affect test results, significantly enhancing work efficiency and reducing labor intensity. It is the ideal new generation of pressure testing and inspection equipment for valve manufacturing enterprises, users, and maintenance units.
DYFJ-AIOO type valve test bench working principle and structure
The DYFJ-AIOO type valve test bench operates by locating the valve flange and clamping the back of the flange with movable jaws, ensuring no external forces affecting the test results. It meets the national standard valve testing requirements.
Equipment is broadly categorized into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operational devices.
The equipment features a horizontal clamp pressure design. Both the left and right workbenches are sealed with blind flanges. The left workbench is equipped with an in/out function mechanism, directly driven by a hydraulic cylinder, ensuring uniform force on the valve sealing surface and reliable clamping. (Left) The right workbench can be flipped 90 degrees for easy inspection of gas sealing tests and observation of the valve sealing surface, offering good performance and a simple, compact structure.
Operation Method
Valve Mounting Method
Select a valve with the nominal pipe size corresponding to the equipment model, turn on the power, and start the hydraulic system. Move the left carriage back to a position longer than the valve being tested. Radially move the adjustable clamp to a diameter larger than the valve flange outer diameter. Extend the clamp axially to exceed the thickness of the valve flange. Place the valve flange face against the left workbench test blind plate, aligning with the center hole. Radially move the clamp close to the valve flange, and axially move the clamp to ensure it snugly adheres to the back of the valve flange. At this point, the valve should be securely clamped and fixed by the left clamping system to ensure it does not come loose.
The sliding bracket moves to the right, aligning with the fixed workbench. The other end of the valve to be tested is tightly pressed against the right test blind flange, aligned with the center opening. Radially move the clamping jaws close to the valve flange. Axially move the clamping jaws to ensure they are flush against the back of the valve flange. At this point, the valve should be securely clamped and fixed by the right-side clamping system, with the valve positioned horizontally.
2. Water Pressure Testing Methods (Double-direction Inflow and Drainage)
After the valve mount is completed, refer to the "Clamping Cylinder Pressure Comparison Table" to increase the hydraulic clamp's gripping 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 intake, left and right water intake valves, close the air intake, 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 high-pressure water pump will automatically stop when the water pressure reaches the pressure set on the electrical contact pressure gauge. The equipment then enters the water pressure holding state.
Upon reaching the pressure-holding time, the valve is free of any issues. First, open the water valve to release the pressure within the valve chamber, then remove the valve.
3. Pressure Testing Methods (Bi-directional Intake and Venting)
The equipment does not come with its own gas source. The user must provide an external 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 of pressure), 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 will be in a pressure-holding state.
Upon reaching the pressure-holding time, the valve is problem-free. First, open the vent valve to release the pressure inside the valve chamber, then remove the valve.
Usage Instructions and Requirements
1. Ensure the equipment is level during installation or secure the foot slot steel with concrete.
2. Use 46-grade anti-wear hydraulic oil (for temperatures below 0°C, use antifreeze 46-grade anti-wear hydraulic oil). Ensure the oil level does not fall below the gauge's lower limit. 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 worktop should be kept clean, and there should be no debris between the test valve flange and the pressure test blank.
5. Add lubricant to all moving parts of the test bench to ensure clean and smooth operation.
6. Operators must undergo professional training before starting work, adhere to standardized procedures, and prioritize safety.
