The DYFJ-C200 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-C200 valve testing bench integrates mechanical, hydraulic systems, pressure testing, and the storage and recycling of liquid media. It features comprehensive functions, stable performance, and high degree of automation. It is widely used for the leakage testing of sealing surfaces and shell strength (pore) tests on various high, medium, and low-pressure valves with nominal bore sizes of 50-200mm, in the form of straight-through flanges. Test media: water, gas, oil.

The equipment is fully hydraulically driven and electrically controlled, with no external forces affecting the valve test results, significantly enhancing work efficiency and reducing labor intensity. It is the ideal new generation valve pressure testing equipment for valve manufacturing enterprises, users, and maintenance units.

DYFJ-C200 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 a live paw, ensuring no external forces affect the test results, thereby complying with national standard valve testing requirements.

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 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 distribution on the valve sealing surface for reliable tightness. Both left and right workbenches can be flipped 90 degrees. The entire workbench can be submerged into an external water tank, allowing the entire test valve to be soaked in water, facilitating the inspection of the gas-tightness test and observation of the valve sealing surface. It boasts excellent performance, a simple and 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 carriage back to a position longer than the test valve, and radially move the actuating claw to exceed the outer diameter of the test valve flange. Extend the claw axially to surpass the thickness of the valve flange. Place the valve flange face against the left workbench test blind plate, aligning with the center opening. Radially move the claw close to the valve flange, and axially move the claw to make it tightly against the back of the valve flange. At this point, the valve should be securely held and fixed by the left 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 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 ensure they 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 in an overall horizontal position.

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

After the valve bracket is installed, refer to the "Clamping Cylinder Pressure Comparison Table" 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 water inlet, left and right water inlet valves, close the air inlet, drain, and vent 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; 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 holding state.

Upon reaching the pressure holding time, the valve is free of any issues. First, open the drain valve to release the water pressure within the valve chamber, then remove the valve.

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

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

After the valve fixture is completed (for example, using pressure air, usually not exceeding 10 kg), open the inlet and intake valves, and close the drain and exhaust valves. Close the inlet and intake valves when the pressure gauge reaches the maximum pressure, and the equipment is in a pressure-holding state.

Upon reaching the pressure-holding time, the valve shows no issues. First, open the vent valve to release the pressure inside the valve chamber, then remove the valve.

Handling Instructions and Requirements

1. Align the equipment horizontally during installation or secure the footings with concrete.

2. Choose 46-grade anti-wear hydraulic oil (use anti-freeze 46-grade anti-wear hydraulic oil below 0℃), ensuring oil level does not fall below the gauge's lower limit. Regularly inspect oil levels 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 replace it 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. Add lubricant to all moving parts of the test bench to ensure clean and smooth operation.

6. Operators must undergo professional training before taking their positions, adhere to standard procedures, and prioritize safety.