The DYFJ-E600 valve testing bench is the fourth-generation pressure testing and detection equipment independently developed by Duojia Hydraulics, based on years of production experience and in accordance with national standards and specifications.

The DYFJ-E600 valve testing bench integrates mechanical, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums into one unit, featuring comprehensive functions, stable performance, and high degree of automation. It is widely used for sealing surface leakage testing of various high, medium, and low-pressure valves with nominal bore sizes of 300-600mm, as well as for shell strength (sanding) and other performance tests. Testing media: water, gas, oil.

The equipment is hydraulically driven and electrically controlled throughout its process, exerting no additional external force on valves that would 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 enterprises, users, and maintenance units.

DYFJ-E600 type valve test bench working principle and structure

The DYFJ-E600 type 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. It meets the 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 is of horizontal-laying, top-pressure design. Each side of the workbench is sealed with a blind flange. The left workbench features an in and out function mechanism, directly driven by a hydraulic cylinder, ensuring even force distribution on the valve sealing surface for reliable clamping. The right workbench is stationary, allowing bidirectional water intake and drainage. The sealing disk is equipped with drainage and vent valves for easy checking of the air-tightness test and observation of the valve sealing surface. It boasts excellent performance, simple and compact structure.

Operation Instructions

1. Valve Mounting Method

Select a valve with the nominal bore that matches the equipment model, turn on the power, and start the hydraulic system. Move the left-hand cylinder back until it is longer than the length of the valve under test. Place the valve flange against the right-hand workbench test blind plate, aligning it with the center opening. Move the left-hand mounting frame towards the right-hand fixed workbench, with the other end of the valve under test pressed against the left-hand test blind plate, aligning it with the center opening. The valve is overall 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 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 pointer to 2.5 MPa). Open the main inlet and left and right 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; when the water pressure reaches the pressure set on the electrical contact pressure gauge, the high-pressure water pump automatically stops, and the equipment enters the water pressure maintenance state.

Upon reaching the pressure-holding time, the valve is problem-free. First, open the water valve to relieve the water pressure inside the valve chamber, then remove the valve.

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

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

After the valve mounting is complete (for example, using compressed air, typically not exceeding 10 kg of pressure), 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 will be in a pressure-holding state.

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

Usage Instructions and Requirements

Ensure the equipment is level during installation or use concrete to secure the anchor slot steel.

2. Choose 46-grade anti-wear hydraulic oil (use antifreeze 46-grade anti-wear hydraulic oil below 0℃), ensuring the oil level does not fall 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 anti-rust powder to the recirculating water, and change the water promptly when the water quality deteriorates.

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

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 standard procedures, and prioritize safety.