The DYFJ-F100 valve testing bench is the fourth-generation pressure testing and inspection equipment independently developed by Duojia Hydraulics on the basis of many years of production experience, in accordance with national standards and specifications.

The DYFJ-F100 type valve test bench integrates mechanical and electrical, hydraulic systems, pressure testing, and storage and recycling of liquid mediums. It boasts comprehensive functions, stable performance, and a high degree of automation. It is widely used for sealing face leakage testing and various performance tests such as shell strength (pinhole) on high, medium, and low-pressure valves with nominal bore sizes of 15-100mm, including straight flange, welding, threaded, and clamp-type valves. Test mediums: water, gas, oil.

The equipment is hydraulically driven and electrically controlled throughout the process, with no external forces affecting the valve test results, significantly enhancing work efficiency and reducing labor intensity. It is an ideal new generation pressure testing and inspection equipment for valve manufacturing enterprises, users, and maintenance units.

DYFJ-F100 Valve Test Bench Working Principle and Structure

The DYFJ-F100 type valve testing bench operates by positioning the valve flange face and using a hydraulic cylinder to tightly clamp the flange surface. It ensures that no external forces that could affect the test results are applied to the valve testing, adhering to 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 vertical top pressure with each workbench (upper and lower) sealed with blind flanges. The upper workbench is equipped with an in and out mechanism, directly driven by a hydraulic cylinder to ensure even force distribution on the valve sealing surface for reliable tightness. The lower workbench is fixed, allowing bidirectional water intake and drainage. The sealing disk includes drainage and exhaust valves for easy inspection of the gas-sealing test and observation of the valve sealing surface condition. It boasts excellent performance and a simple, compact structure.

Operation Instructions

1. Valve Mounting Method

Select a valve with the nominal pipe size that matches the equipment model, turn on the power supply, and start the hydraulic system. Move the upper cylinder back to a position longer than the tested valve. Place the valve flange face tightly against the lower workbench test blind plate, aligning with the center hole. Lower the upper moving frame onto the fixed lower workbench, positioning the other end of the tested valve against the lower test blind plate, aligning with the center hole. The valve is in a horizontal position overall.

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

After the valve bracket is assembled, refer to the "Clamping Cylinder Pressure Comparison Table" to increase the hydraulic jaw's clamping force to the required pressure. Adjust the electrical contact pressure gauge (for a 25 kg valve, adjust the pointer of the electrical contact pressure gauge to 2.5 MPa). Open the main inlet, upper and lower water inlet valves, close the air inlet, drain, and vent valves. Start the low-pressure water pump and 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 pump will automatically stop when the water pressure reaches the set pressure on the electrical contact pressure gauge. The equipment enters the water pressure holding state.

Upon reaching the pressure holding time, the valve is problem-free. First, open the drain valve to release the water pressure within the valve chamber, then remove the valve.

3. Pressure Testing Methods (Bi-directional Intake, Venting)

The equipment is not supplied with a gas source. The user must provide an additional gas source. Please consult the manufacturer before using high-pressure gases.

After the valve mount is complete (for example, using pressure air, typically not exceeding 10 kg), 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 highest pressure, and the equipment will be in a pressure retention state.

Upon reaching the pressure-holding time, the valve is free of any issues. It is advisable to first open the vent valve to release the pressure inside the valve chamber before removing the valve.

Handling Instructions and Requirements

1. Align the equipment horizontally during installation or use concrete to secure the foot slot steel.

2. Choose 46-grade anti-wear hydraulic oil (use anti-freeze 46-grade anti-wear hydraulic oil below 0℃), ensuring 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 anti-rust powder 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 test valve flange and the test pressure blank flange.

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.