The DYFJ-F300 valve testing bench is the fourth-generation pressure testing and inspection equipment independently developed by Duojia Hydraulics, based on years of production experience and in accordance with national standards and specifications.
The DYFJ-F300 valve test bench integrates mechanical and electrical systems, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums. It features comprehensive functions, stable performance, and high automation. It is widely used for sealing surface leakage testing and shell strength (pinhole) testing of various high, medium, and low-pressure valves with nominal diameters of 80-300mm, including straight-through flanges, welding, threaded, and clamp-type connections. Test media: water, gas, oil.
The equipment is hydraulically driven and electrically controlled throughout the process, exerting no external forces on the valves that would affect test results, significantly enhancing work efficiency and reducing labor intensity. It is the ideal new generation pressure testing and inspection equipment for valve manufacturing enterprises, users, and maintenance units.
DYFJ-F300 Valve Test Bench Working Principle and Structure
The DYFJ-F300 valve testing bench operates by locating the valve flange face and using hydraulic cylinders to clamp the flange surface, ensuring no external force affecting the test results, in compliance with the national standard requirements for valve testing.
The equipment is broadly categorized 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 worktables are sealed with blind flanges. The upper worktable is equipped with a forward and reverse mechanism, directly driven by a hydraulic cylinder for even pressure distribution on the valve sealing surface, ensuring reliable tightness. The lower worktable is stationary, featuring bidirectional water intake and drainage. The sealing disk is fitted with drainage and exhaust valves for convenient checks of the air-sealing test and observation of the valve sealing surface. It boasts good performance and a simple, compact structure.
Operation Instructions
1. Valve Mounting Method
Select a valve with the nominal diameter corresponding to the equipment model, turn on the power, and start the hydraulic system. Move the upper cylinder upward until it is longer than the length of the valve under test. Place the valve flange face against the lower workbench test blind plate, aligning with the center hole. Lower the upper movable frame onto the lower fixed workbench, positioning the other end of the valve under test against the lower test blind plate, aligning with the center hole. The valve is positioned horizontally overall.
2. Water Pressure Testing Methods (Bi-directional Inflow, 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 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 full of water. Start the high-pressure water pump; the high-pressure water pump automatically stops when the water pressure reaches the pressure set on the electrical contact pressure gauge. The equipment enters the water pressure maintenance state.
Upon reaching the pressure-holding time, the valve is free of any issues. First, open the water valve to relieve the pressure inside the valve chamber, and then remove the valve.
3. Pressure Testing Methods (Bi-directional Intake, Exhaust)
The equipment does not come with a gas supply. 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 of pressure), open the inlet and air inlet valves, and close the drain and air vent valves. Close the inlet and air inlet 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. It should first be opened to release the pressure inside the valve chamber before removing the valve.
Usage Instructions and Requirements
1. Align the equipment horizontally during installation or secure the foot slot steel with concrete.
2. Select 46-grade abrasive-resistant hydraulic oil (use antifreeze 46-grade abrasive-resistant hydraulic oil below 0℃), ensuring the oil level is not 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 anti-rust powder to the recirculating water, and replace it 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 testing blank flange.
5. Add lubricant to all moving parts of the testing bench to ensure clean and smooth operation.
6. Operators must undergo professional training before assuming their positions, adhere to standard operations, and prioritize safety.
