The DYFJ-A600 valve test bench is the fourth generation pressure testing and inspection equipment independently developed by Duojia Hydraulics on the basis of many years of production experience, in accordance with national standards and specifications.

The DYFJ-A600 valve testing bench integrates mechanical, hydraulic systems, pressure testing, and liquid medium storage and recycling. It features complete functions, stable performance, and high level of automation. It is widely used for sealing surface leakage tests, shell strength (pinhole) and other performance tests on various high, medium, and low-pressure valves with nominal bore sizes of 300-600mm and direct flange type. Test media: water, air, oil.

The equipment is driven by hydraulic power and controlled by electricity, exerting no additional external force on valves that could affect test results, significantly enhancing work efficiency and reducing labor intensity. It is an ideal new generation pressure testing and inspection equipment for valve manufacturing companies, users, and maintenance units.

DYFJ-A600 Type Valve Test Bench Working Principle and Structure

The DYFJ-A600 type valve test bench operates by positioning the valve flange and clamping the back of the flange with live claws, ensuring no external forces affect the test results during valve testing, in compliance with national standard requirements for valve testing.

The equipment is broadly categorized into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operational devices.

The equipment is a horizontal clamp type, with each workbench on the left and right sides sealed with blind flanges. The left workbench is equipped with a forward and reverse mechanism, directly driven by a hydraulic cylinder to ensure even force distribution on the valve sealing surface and reliable clamping. (Left) The right workbench can be flipped 90 degrees for easy inspection of gas-tightness tests and observation of the valve sealing surface, featuring 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 left sliding bracket back to a position longer than the test valve, radially move the sliding jaws to a diameter larger than the test valve flange, and extend the jaws axially to exceed the thickness of the valve flange. Place the valve flange face tightly against the left workbench test blind plate, aligning with the center opening. Radially move the 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 held in place by the left-side clamping system, ensuring that the valve will not come loose.

The sliding bracket moves to the right fixed workbench, with the other end of the valve tightly pressed against the right pressure test blind 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 mounting is complete, refer to the "Clamping Cylinder Pressure Reference Table" to increase the hydraulic clamp 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 water inlet, left and right water inlet valves, close the air inlet, drain, and exhaust 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, and the high-pressure water pump will automatically stop when the water pressure reaches the pressure set 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 advisable to first open the drain valve to relieve the water pressure within the valve cavity, 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 clamp is completed (for example, using pressure air, usually not exceeding 10 kg), open the inlet and air inlet valves, and close the drain and air release valves. Close the inlet and air inlet 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 shows no issues. It should first be opened to release the air pressure inside the valve chamber, and then the valve can be removed.

Instructions and Requirements for Use

Ensure the equipment is level during installation or securely anchor the foot trough with concrete.

2. Use 46-grade anti-wear hydraulic oil (use frost-proof 46-grade anti-wear hydraulic oil below 0℃), ensuring oil level is not below the gauge's lower limit. Regularly check oil levels and hydraulic oil. After one year of use, clean the oil tank and replace the hydraulic oil.

3. Add anti-rust powder to the recirculating water, and 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. All moving parts of the test 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.