The DYFJ-H300 valve testing bench is the fourth-generation pressure testing and detection equipment independently developed by Duojia Hydraulics, based on many years of production experience and in accordance with national standards and specifications.

The DYFJ-H300 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 automation. It is widely used for the leakage testing of sealing surfaces and shell strength (pinholes) on various high, medium, and low-pressure valves with nominal diameters of 50-300mm, in the form of straight-through flanges. Test mediums: water, air, oil.

The equipment is driven by hydraulic power and controlled by electricity, exerting no additional external force on the valves that could affect test results. This significantly enhances work efficiency and reduces labor intensity, making it the ideal new generation pressure testing equipment for valve manufacturing enterprises, users, and maintenance units.

DYFJ-H300 Valve Test Bench Operating Principle and Structure

The DYFJ-H300 valve test bench operates by using valve flange positioning and a live claw to clamp the back of the flange, ensuring that there are no external forces affecting the test results that could influence the valve testing, in compliance with 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 is clamp-style, with both sides of the workbench sealed with blind flanges. The hydraulic gripper features axial extension and radial movement capabilities, directly driven by hydraulic cylinders to ensure uniform force distribution on the valve sealing surface and reliable clamping. During testing of the butterfly valve, the sealing performance is easily observable, facilitating the inspection of air-sealing tests and the 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 a nominal bore size that matches the equipment model, turn on the power, and start the hydraulic system. Move the hydraulic actuating clamp radially to exceed the outer diameter of the test valve flange, and extend the actuating clamp axially to exceed the valve length. Place the lower flange of the valve face-to-face with the test blind plate on the workbench, aligning with the center hole. Move the radial clamp close to the valve flange, and the axial clamp to ensure the clamp is flush with the valve flange face. At this point, the valve is securely held in place by the clamping system, ensuring it will not vibrate.

During the test of the valve body strength, the other end of the valve to be tested is tightly sealed against the upper 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 test blind flange. At this moment, the valve should be securely held and fixed by the clamping system, with the entire valve in a stable state.

2. Water Pressure Testing Methods (Double-direction Inflow and 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 electric contact pressure gauge (for a 25 kg valve, adjust the gauge pointer to 2.5 MPa). Open the main inlet and left and right water inlets, close the air intake, drain, and exhaust valves. Start the low-pressure water pump, observe the movement of the pressure gauge pointer. When the pointer stops rising, it indicates the valve cavity is filled with water. Start the high-pressure water pump, and the pump will automatically stop when the pressure reaches the setting on the electric contact pressure gauge. The equipment then enters a 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, Exhaust)

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

After the valve clamp is completed (using pressure air as an example, generally not exceeding 10 kg), open the inlet and air inlet valves, and close the drain and air drain valves. Close the inlet and air inlet valves when the pressure gauge reaches the highest pressure, and the equipment is 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 chamber, and then remove the valve.

Handling Instructions and Requirements

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

2. Use 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 inspect 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 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. Add lubricant to all moving parts of the test bench to ensure clean and smooth operation.

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