The DYFJ-E500 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-E500 valve test bench integrates mechanical and electrical, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums into one unit, featuring comprehensive functions, stable performance, and high automation. It is widely used for sealing surface leakage tests and various performance tests such as shell strength (pinhole) on high, medium, and low-pressure valves with nominal bore diameters of 200-500mm, in the form of straight-through flanges. Test media: water, gas, oil.

The equipment is driven and controlled by hydraulic power and electrical systems, with no external forces affecting the valve test results, greatly enhancing work efficiency and reducing labor intensity. It is an ideal new generation pressure testing and inspection equipment for valve manufacturing companies, users, and maintenance units.

DYFJ-E500 Type Valve Test Bench Working Principle and Structure

The DYFJ-E500 type valve test bench operates by positioning the valve flange and clamping the back of the flange with live claws, ensuring no external forces affecting the test results, in compliance with national standard valve testing requirements.

The equipment is broadly categorized into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operating devices.

The equipment features a horizontal卧顶压式 design, with each side of the workbench equipped with a sealed blind plate. The left workbench is fitted with an in/out function mechanism, directly driven by a hydraulic cylinder, ensuring uniform force distribution on the valve sealing surface for reliable clamping. The right workbench remains stationary, allowing for bidirectional water intake and drainage. The sealing disc is equipped with drainage and exhaust valves, facilitating checks for air-tightness tests and observations 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 left-hand cylinder back until it's longer than the valve being tested. Place the valve flange face tightly against the right-hand workbench test blind plate, aligning with the center hole. Move the left-hand frame to the right towards the fixed workbench, with the other end of the valve being tested pressed against the left-hand test blind plate, aligning with the center hole. The valve is in a horizontal position overall.

2. Water Pressure Testing Methods (Bi-directional Inflow and Drainage)

After the valve mount is completed, refer to the "Clamping Cylinder Pressure Chart" 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, left and right water inlets, 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 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 relieve the pressure inside the valve chamber, and then remove the valve.

3. Pressure Testing Methods (Bidirectional Inlet and 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, generally not exceeding 10 kg pressure), open the inlet and intake valves, and close the drain and exhaust valves. Close the inlet and intake valves when the pressure gauge reaches the maximum pressure, and the equipment is 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 cavity, then remove the valve.

Handling Instructions and Requirements

1. Ensure the equipment is level during installation or use concrete to secure the base槽钢.

2. Use 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, and replace it promptly when the water quality deteriorates.

4. The work surface of the equipment should be kept clean, and there should be no debris between the valve flange under test and the pressure test blind plate.

5. Add lubricant to all moving parts of the test bench to ensure clean and smooth operation.

6. Operators must undergo professional training before assuming their positions, adhere to standardized procedures, and prioritize safety.