The DYFJ-C600 valve test bench is the fourth-generation valve pressure testing equipment independently developed by Duojia Hydraulic Co., Ltd., based on years of production experience and in compliance with national standards and specifications.

The DYFJ-C600 valve test bench integrates mechanical and electrical systems, 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 shell strength (pinhole) tests on various high, medium, and low-pressure valves with nominal diameters of 15-1200mm, in direct flange style. Test mediums: water, gas, oil.

The equipment is fully powered by hydraulic drive and electric control, exerting no additional external force on the valves that could affect test results, significantly enhancing work efficiency and reducing labor intensity. It is the ideal new generation of pressure testing and inspection equipment for valve manufacturing companies, users, and maintenance units.

DYFJ-C600 Valve Test Bench Working Principle and Structure

The DYFJ-C600 type valve test bench operates by positioning the valve flange and clamping the back of the flange with live jaws, ensuring that no external forces affecting the test results are present during valve testing, in compliance with the national standard valve testing requirements.

The equipment is broadly categorized 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 side of the workbench sealed with a blind plate. The left workbench is equipped with an in-and-out mechanism, directly driven by a hydraulic cylinder, ensuring uniform force 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 for easy inspection of gas-tightness tests and observation of the valve sealing surface. It boasts good performance, simple and compact structure.

Technical Specifications

Operation Instructions

1. Valve Mounting Method

Select a valve with a 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 actuating claw to exceed the outer diameter of the valve flange. Extend the claw axially to exceed the thickness of 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 claw close to the valve flange; axially move the claw to make the claw tightly adhere to the back of the valve flange. At this point, the valve should be securely clamped and fixed by the left-hand clamping system, ensuring the valve does not fall off.

The sliding bracket moves to the right, aligning with the fixed workbench. The other end of the valve being tested is tightly pressed against the right test blind flange, centered over the empty space. 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 right-side clamping system, with the valve in a horizontal position overall.

2. Water Pressure Testing Methods (Bi-directional Inflow, Drainage)

After the valve clamp is assembled, refer to the "Clamping Cylinder Pressure Comparison Table" to increase the hydraulic clamp force to the required pressure. Adjust the electrical contact pressure gauge (for example, for a 25 kg valve, adjust the pointer of the electrical contact pressure gauge to 2.5 MPa). Open the main water inlet, left and right water inlets, close the air inlet, drain, and vent 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, and the pump will automatically stop when the water pressure reaches the pressure set on the electrical contact pressure gauge. The equipment enters the water pressure holding 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 Intake, Venting)

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 mount is completed (for example, using pressure air, generally 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 highest pressure, and the equipment is in a pressure maintenance state.

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

Handling Instructions and Requirements

1. Align the equipment horizontally during installation or secure the foot trough 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, and change the water promptly when the water quality deteriorates.

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

5. All moving parts on the test bench should be lubricated to ensure clean and smooth operation.

6. Operators must undergo professional training before starting work, adhere to standard procedures, and prioritize safety.