The DYFJ-C100 type valve testing bench is the fourth-generation valve pressure testing and detection equipment independently developed by Duojia Hydraulics on the basis of many years of production experience, in accordance with national standards and specifications.

The DYFJ-C100 valve test bench integrates mechanical, hydraulic systems, pressure testing, and the storage and recycling of liquid media into one unit, featuring complete functions, stable performance, and high level of automation. It is widely used for sealing face leakage tests and other performance tests, such as shell strength (pinhole), on various high, medium, and low-pressure valves with nominal diameters of 15-100mm and direct-connection flanges. Test media: 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-C100 Type Valve Test Bench Working Principle and Structure

The DYFJ-C100 type valve testing 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, in compliance 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 a diving double-tilt design, with each workbench equipped with a sealed blind plate. The left workbench is fitted with an in/out mechanism, directly driven by a hydraulic cylinder, ensuring uniform force distribution on the valve sealing surface and 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 tested valve to be fully immersed in water. This facilitates the inspection of gas-tightness tests and observation of the valve sealing surface. It boasts excellent performance and a simple, compact structure.

Operation Instructions

Valve Mounting Method

Select a valve with a nominal bore size that matches the equipment model, turn on the power supply, and start the hydraulic system. Move the left-hand carriage back to a position longer than the valve being tested. Radially move the clamping jaws to a diameter larger than the outside diameter of the valve flange. Extend the clamping jaws axially to a thickness greater than the valve flange. Place the valve flange face tightly against the left-hand workbench test blind plate, aligning with the center hole. Radially move the clamping jaws close to the valve flange. Axially move the clamping jaws to ensure they tightly adhere to the back of the valve flange. At this point, the valve should be securely held by the left-hand clamping system to prevent it from falling off.

The left-hand moving bracket advances towards the right-hand fixed workbench, while the other end of the valve being tested is tightly sealed against the right-hand pressure testing blank flange, aligned with the center empty space. Radially move the clamping jaws close to the valve flange, and axially move the jaws to make them tightly adhere to the back of the valve flange. At this point, the valve should be securely clamped and fixed by the right-hand clamping system, with the entire valve in a horizontal position.

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 pointer of the electrical contact pressure gauge to 2.5 MPa). Open the main water inlets, left and right water inlets, 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 high-pressure water pump will automatically stop when the water pressure reaches the pressure set on the electrical contact pressure gauge, and the equipment enters the water 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, and then remove the valve.

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

The equipment does not come with a gas source. Users must provide their own. 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 maximum pressure, and the equipment is in a pressure-holding state.

Upon reaching the pressure-holding time, there are no issues with the valve. It should be initially opened to vent the pressure inside the valve chamber, then remove the valve.

Instructions and Requirements for Use

Ensure the equipment is level during installation or securely anchor the base slot steel with concrete.

2. Choose 46-grade anti-wear hydraulic oil (use antifreeze 46-grade anti-wear hydraulic oil below 0℃), ensuring 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 blind flange for pressure testing.

5. Add lubricant to all moving parts of the test bench to maintain clean and smooth operation.

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