The DYFJ-C200 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-C200 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 50-200mm and direct flange connections. Test media: water, gas, oil.

The equipment is hydraulically driven and electrically controlled throughout its 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-C200 Type Valve Test Bench Working Principle and Structure

The DYFJ-C200 valve test bench operates by positioning the valve flange and clamping the back of the flange with movable claws, ensuring no external forces that could affect the test results during valve testing, in compliance with national standard requirements for valve testing.

The equipment is generally 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 (left and right) sealed with a blind flange. The left workbench is equipped 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 test valve to be fully immersed in water. This facilitates the inspection of gas-tightness tests 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 the nominal bore size that matches the equipment model, turn on the power, and start the hydraulic system. Move the left-hand carriage back to a position longer than the test valve. Radially move the movable clamp to a diameter larger than the test valve flange outer diameter. Extend the clamp axially to exceed the valve flange thickness. Place the valve flange face against the left-hand workbench test blind plate, aligning with the center hole. Radially move the clamp close to the valve flange. Axially move the clamp to ensure the clamp is tightly against the back of the valve flange. At this point, the valve should be securely clamped and fixed by the left-hand clamping system to ensure the valve does not come loose.

The left-hand movable bracket advances to the right-hand fixed workbench, with the other end of the valve being tightly sealed against the right-hand pressure test blanking plate, aligned with the center opening. 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 valve positioned horizontally as a whole.

2. Water Pressure Testing Methods (Bi-directional Inflow, 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 inlet, left, and right inlet valves, close the air intake, drain, and exhaust valves. Start the low-pressure water pump, observe the movement of the 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 free of any issues. First, open the water valve to relieve the pressure inside the valve chamber, and then remove the valve.

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

The equipment does not come with a gas source. The user must provide an external gas source. Please consult the manufacturer before using high-pressure gases.

After the valve bracket is installed (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 exhaust valves. Close the water and air intake valves when the pressure gauge reaches the maximum pressure, and the equipment is in a pressure maintenance state.

Upon reaching the pressure-holding time, the valve is problem-free. First, open the vent valve to release the pressure inside the valve cavity, then remove the valve.

Handling Instructions and Requirements

1. Ensure the equipment is level during installation or secure the anchor slots with concrete.

2. Use 46-grade anti-wear hydraulic oil (use antifreeze 46-grade anti-wear hydraulic oil below 0℃), ensuring the oil level is not 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; replace it promptly when the water quality deteriorates.

4. The equipment work surface should be kept clean, and there should be no debris between the test valve flange and the test pressure blank flange.

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.