DYFJ-E400 Valve Test Bench

The DYFJ-E400 valve testing bench is the fourth generation pressure testing and detection equipment independently developed by Duojia Hydraulics, based on many years of production experience and in accordance with national standards and specifications.

The DYFJ-E400 valve test bench integrates mechanical and electrical, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums. It features comprehensive functions, stable performance, and high levels of automation. It is widely used for sealing surface leakage tests and other performance tests, such as shell strength (pinhole), on various high, medium, and low-pressure valves with nominal bore sizes of 150-400mm and direct flange connections. Test media: water, gas, oil.

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

DYFJ-E400 Valve Test Bench Working Principle and Structure

The DYFJ-E400 valve test bench operates by positioning the valve flange and clamping the back of the flange with a live paw, ensuring no external forces affect the test results, thereby complying with national standard requirements for valve testing.

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

The equipment is a horizontal-laying top-pressure type. Each workbench on the left and right sides is sealed with blind flanges. The left workbench is equipped with an in/out mechanism, directly driven by a hydraulic cylinder to ensure uniform force distribution on the valve sealing surface and reliable clamping. The right workbench remains stationary, featuring bidirectional water intake and drainage. The sealing disc is fitted with drainage and exhaust valves, facilitating the inspection of gas-sealing tests and observation of the valve sealing surface. It boasts excellent performance and a simple, compact structure.

Operation Instructions

1. Valve Mounting Method

Select a valve with a nominal bore diameter that matches the equipment model, turn on the power, and start the hydraulic system. Move the left-hand cylinder back to a position longer than the length of the valve being tested. Place the valve flange face tightly against the right-hand workbench test blind plate, aligning it with the center hole. Move the left-hand frame to the right-hand 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 (Double-direction 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 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 problem-free. First, open the water drain valve to release the water pressure inside the valve chamber, then remove the valve.

3. Pressure Test Methods (Bi-directional Intake and Exhaust)

The equipment does not come with its own gas supply. 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 compressed air at a pressure 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 highest pressure, and the equipment is in a pressure-holding state.

Upon reaching the pressure-holding time, there are no issues with the valve. First, open the vent valve to release the pressure inside the valve chamber, then remove the valve.

Handling Precautions and Requirements

1. Align the equipment horizontally during installation or secure the base channel with concrete.

2. Choose 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'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 blanking 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 starting work, adhere to standard procedures, and prioritize safety.