DYFJ-F200 High Pressure Valve Test Bench

The DYFJ-F200 type valve test bench is a fourth-generation pressure testing and inspection equipment developed by Duojia Hydraulic Co., Ltd., based on many years of production experience, in accordance with national standards and specifications.

The DYFJ-F200 valve testing bench integrates mechanical, hydraulic systems, pressure testing, and the storage and recycling of liquid media into one unit. It features complete functions, stable performance, and a high degree of automation. It is widely used for the sealing surface leakage testing of various high, medium, and low-pressure valves with nominal pipe diameters of 50-200mm, including direct flanges, welding, threaded, and clamp-type valves, as well as for shell strength (pinhole) and other performance tests. Test media: water, air, oil.

The equipment is hydraulically driven and electrically controlled throughout the process, with no external forces affecting the valve's test results, greatly 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-F200 Type Valve Test Bench Working Principle and Structure

The DYFJ-F200 type valve test bench operates by using valve flange face positioning and a hydraulic cylinder to tightly clamp the flange face, ensuring no external forces that could affect test results. It complies with national standard requirements for valve testing.

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, with both the upper and lower worktables sealed with blind flanges. The upper worktable is equipped with an in/out function mechanism, directly driven by a hydraulic cylinder for even force distribution on the valve sealing surface and reliable tightness. The lower worktable is fixed and allows for 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 a nominal diameter that matches the equipment model, turn on the power, and start the hydraulic system. Move the upper cylinder upward 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 valve is pressed against the lower test blind plate, aligned with the center opening. The valve is positioned horizontally overall.

2. Water Pressure Testing Methods (Two-way Inflow and Drainage)

After the valve clamp is in place, 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 needle 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 pressure gauge needle. When the needle stops rising, it indicates 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 then enters a pressure-holding state.

Upon reaching the pressure-holding time, the valve shows no issues. First, open the drain valve to release the water pressure inside the valve chamber, then remove the valve.

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

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, typically not exceeding 10 kg pressure), open the inlet and air inlet valves, and close the drain and air drain valves. Close the inlet and air inlet valves when the pressure gauge reaches the maximum pressure, and the equipment will be in a pressure-holding state.

Upon reaching the pressure-holding time, the valve shows no issues. 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 anchor flange with concrete.

2. Choose 46-grade anti-wear hydraulic oil (use antifreeze 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 equipment worktop should be kept clean, and there should be no debris between the test valve flange and the pressure test blind 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 assuming their positions, adhere to standardized procedures, and prioritize safety.