The YFJ-B50 valve testing bench is the fourth-generation pressure testing and inspection equipment independently developed by Duojia Hydraulics, based on many years of production experience and in accordance with national standards and specifications.

The DYFJ-B50 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 degree of automation. It is widely used for sealing surface leakage testing and other performance tests such as shell strength (pinhole) of various high, medium, and low-pressure valves with nominal diameters of 15-50mm and direct flanged connections. Test mediums: water, gas, oil.

The equipment is hydraulically driven and electrically controlled throughout its process, exerting no additional external force on the valves that could affect test results. This significantly enhances work efficiency and reduces labor intensity, making it the ideal next-generation valve pressure testing equipment for valve manufacturing enterprises, users, and maintenance units.

DYFJ-B50 Type Valve Test Bench Working Principle and Structure

The DYFJ-B50 type valve test bench operates by positioning the valve flange and clamping the back of the flange with a live jaw, ensuring no external force affects the test results, thereby complying with national standard requirements for valve testing.

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

The equipment features vertical top pressure with both upper and lower workbenches sealed with blind flanges. The upper workbench is equipped with a forward and reverse mechanism, directly driven by a hydraulic cylinder, ensuring even force distribution on the valve sealing surface for reliable clamping. The lower workbench is fixed and allows for bidirectional water intake and drainage. The sealing disk is fitted with drainage and exhaust valves, facilitating checks for gas-tightness tests and observations of the valve sealing surfaces. It boasts excellent performance and a simple, compact structure.

Operation Instructions

1. Valve Mounting Method

Select a valve with a nominal bore that matches the equipment model, turn on the power, and start the hydraulic system. Move the upper cylinder upwards until it is longer than the tested valve. Place the valve flange face tightly against the lower workbench test blind plate, aligning with the center opening. Lower the upper movable frame towards the fixed lower workbench, ensuring the other end of the tested valve is in contact with the lower test blind plate, aligned with the center opening. 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 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, 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 Test Methods (Bi-directional Intake, Venting)

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 mount is complete (for example, using compressed air, generally 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 maximum pressure, and the equipment is in a pressure-holding state.

Upon reaching the pressure-holding time, the valve is free of any issues. First, open the vent valve to release the pressure inside the valve chamber, then remove the valve.

Cautionary Instructions and Requirements

1. Ensure the equipment is level during installation or secure the anchor slot steel with concrete.

2. Use 46-grade anti-wear hydraulic oil (use anti-freeze 46-grade anti-wear 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 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 testing blank plate.

5. All moving parts of the test bench should be lubricated and kept clean for smooth operation.

6. Operators must undergo professional training before starting work, adhere to standardized procedures, and prioritize safety.