The DYFJ-C500 valve testing bench is the fourth-generation pressure testing and inspection equipment independently developed by Duojia Hydraulics, based on many years of production experience and in accordance with national standards and specifications.

The DYFJ-C500 valve test bench integrates mechanical, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums into one unit. It features comprehensive functions, stable performance, and high levels of automation. It is widely used for sealing face leakage tests of various high, medium, and low-pressure valves with nominal bore diameters of 250-500mm, as well as performance tests such as shell strength (sand holes). Test media: water, gas, oil.

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

DYFJ-C500 Valve Test Bench Working Principle and Structure

The DYFJ-C500 valve test bench operates by positioning the valve flange and clamping the back of the flange with movable claws, ensuring no external forces affect the test results, thereby meeting the 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 flip design, with each workbench (left and right) sealed with a blind plate. The left workbench is equipped with a forward and reverse mechanism, directly driven by a hydraulic cylinder to ensure uniform force distribution on the valve sealing surface and reliable tightness. 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 entire valve to be immersed in water for easy inspection of the gas tightness test and observation of the valve sealing surface. It boasts good performance and a simple, compact structure.

Technical Specifications

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 valve being tested. Radially move the movable jaw to exceed the outer diameter of the valve flange. Extend the jaw axially to exceed the thickness of the valve flange. Place the valve flange face against the left-hand workbench test blind plate, aligning with the center opening. Radially move the jaw close to the valve flange. Axially move the jaw to make it tightly abut the back of the valve flange. At this point, the valve should be securely held and fixed by the left-hand clamping system, ensuring that the valve will not fall off.

The left-hand sliding bracket advances to the right-hand fixed workbench, with the other end of the valve to be tested tightly against the right-hand test blind flange, aligned with the central 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 gripped and fixed by the right-hand clamping system, with the valve as a whole in a horizontal position.

2. Water Pressure Testing Methods (Bidirectional Inflow and Drainage)

After the valve mounting is complete, refer to the "Clamping Cylinder Pressure Chart" to increase the hydraulic clamp's gripping force to the required pressure. Adjust the electrical pressure gauge (for a 25 kg valve, adjust the gauge needle to 2.5 MPa). Open the main inlet, left, and right water inlet valves, close the air inlet, drain, and vent valves. Start the low-pressure water pump and observe the movement of the pressure gauge needle. When the needle 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 pressure gauge. The equipment then enters the 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 cavity, then remove the valve.

3. Pressure Testing Methods (Bidirectional Intake and Exhaust)

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

After the valve mounting is completed (for example, using compressed air, generally not exceeding 10 kg), open the water and air inlet valves, and close the water and air exhaust valves. Close the water and air inlet valves when the pressure gauge reaches the highest pressure, and the equipment remains in a pressure maintenance 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 cavity, and then remove the valve.

Instructions and Requirements for Use

1. Align the equipment's horizontal position during installation or secure the anchor groove steel with concrete.

2. Use 46-grade anti-wear hydraulic oil (for temperatures below 0°C, use anti-freeze 46-grade anti-wear hydraulic oil). Ensure the oil level is not 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; 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 test blind 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 assuming their posts, adhere to standard procedures, and prioritize safety.