DYFJ-C300 Valve Test Bench

The DYFJ-C300 type valve testing bench is a fourth-generation pressure testing and detection device for valves, independently developed by Duojia Hydraulics on the basis of many years of production experience, in accordance with national standards and specifications.

The DYFJ-C300 type valve test bench integrates mechanical and electrical, hydraulic systems, pressure testing, and the storage and recycling of liquid media. It features complete functions, stable performance, and high degree of automation. It is widely used for sealing surface leakage tests and various performance tests such as shell strength (pores) on direct-connection flanged valves of all types, including high, medium, and low-pressure valves, with nominal diameters of 80-300mm. 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, significantly enhancing work efficiency and reducing labor intensity. It is the ideal new generation of valve pressure testing equipment for valve manufacturing companies, users, and maintenance units.

DYFJ-C300 type valve test bench working principle and structure

The DYFJ-C300 valve test bench operates by using valve flange positioning and a live pawl to clamp the back of the flange, ensuring that there are no external forces affecting the test results that could compromise the valve testing, which complies with national standards for valve testing requirements.

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

The equipment features a diving double flip design, with each workbench equipped with a sealed blind plate. The left workbench is fitted with an in-and-out mechanism, directly driven by a hydraulic cylinder, ensuring even force distribution on the valve sealing surface for reliable clamping. Both left and right workbenches can be flipped 90 degrees, and the entire workbench surface can be submerged into the external water tank, allowing the valve to be fully immersed in water for easy testing and observation of the valve sealing surface. It boasts good performance and a simple, compact structure.

Technical Specifications

Operation Instructions

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 left carriage back to a position longer than the test valve. Radially move the movable clamp to exceed the outer diameter of the test valve flange. Extend the clamp axially to exceed the thickness of the valve flange. Place the valve flange face against the left workbench test blind plate, aligning with the center opening. Radially move the clamp close to the valve flange. Axially move the clamp to ensure it snugly contacts the back of the valve flange. At this point, the valve should be securely held and fixed by the left clamping system, ensuring it does not fall off.

The sliding bracket on the left advances to the right fixed workbench. The other end of the valve to be tested is tightly pressed against the right test pressure blank flange, aligned with the center opening. Radially move the clamping jaws close to the valve flange. Axially move the clamping jaws to make the jaws tightly adhere to the back of the valve flange. At this point, the valve should be securely held and fixed by the right clamping system, with the valve in a horizontal position 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 inlet, left, and right 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 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 the water pressure holding state.

Upon reaching the pressure-holding time, there are no issues with the valve. It is recommended to first open the water drain valve to relieve the pressure inside the valve chamber before removing the valve.

3. Pressure Testing Methods (Bidirectional Intake 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 mount is completed (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 maximum pressure, and the equipment remains in a pressure-holding state.

Upon reaching the pressure-holding time, the valve has no issues. It should first be opened to release the pressure inside the valve cavity before removing the valve.

Handling Instructions and Requirements

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

2. Use 46-grade anti-wear hydraulic oil (for temperatures below 0°C, use antifreeze 46-grade anti-wear hydraulic oil). The oil level must not be below the oil 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 change the water promptly when the water quality deteriorates.

4. The work surface of the equipment should be kept clean, and no debris is allowed between the test valve flange and the pressure test blanking plate.

5. All moving parts of the testing 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.