DYFJ-H800 Hydraulic Butterfly Valve Test Bench

The DYFJ-H800 valve testing bench is the fourth generation pressure testing and detection equipment developed independently by Duojia Hydraulics, based on years of production experience and in accordance with national standards and specifications.

The DYFJ-H800 valve test bench integrates mechanical and electrical, 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 (pores) tests on various high, medium, and low-pressure valves with nominal bore sizes of 50-800mm, in the form of straight-through flanges. Test media: water, gas, oil.

The equipment is hydraulically driven and electrically controlled throughout the entire process, exerting no additional external force on valves that could affect test results, significantly enhancing work efficiency and reducing labor intensity. It is the ideal new generation pressure testing and inspection equipment for valve manufacturing companies, users, and maintenance units.

DYFJ-H800 Type Valve Test Bench Working Principle and Structure

The DYFJ-H800 valve test bench operates by positioning the valve flange and clamping the back of the flange with movable claws, ensuring no external forces affect the test results, thus complying with national standard requirements for valve testing.

Equipment is generally divided into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operating devices.

The equipment features a clamp-type design, with both sides of the workbench sealed with blind flanges. The hydraulic clamping jaws have axial extension and radial movement capabilities, directly driven by a hydraulic cylinder to ensure uniform force distribution on the valve sealing surface, providing reliable clamping. When testing the butterfly valve, the sealing performance can be directly observed, facilitating the check of gas-tightness 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 the nominal bore diameter that matches the equipment model, turn on the power, and start the hydraulic system. Move the hydraulic clamping jaws radially to exceed the outer diameter of the test valve flange, and extend axially to exceed the valve length. Place the bottom flange of the valve tightly against the test bench blind plate, aligning with the center hole. Move the radial jaws close to the valve flange, and extend the axial jaws to make the jaws tightly press against the valve flange face. At this point, the valve is securely gripped and fastened by the clamping system, ensuring that the valve will not摇晃.

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

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 water, 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 the valve cavity is fully filled with 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 problem-free. First, open the water drain valve to release the water pressure inside the valve cavity, 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 an external gas source. Please consult the manufacturer before using high-pressure gases.

After the valve fixture is completed (using pressure air as an example, usually not exceeding 10 kg of pressure), open the inlet water and air valves, and close the drain water and air valves. Close the inlet water and air valves when the pressure gauge reaches the maximum pressure, and the equipment is in a pressure maintenance state.

Upon reaching the pressure-holding time, there are no issues with the valve. It is recommended to first open the vent valve to release the pressure inside the valve cavity, and then remove the valve.

Cautionary Instructions and Requirements

1. Ensure the equipment is level during installation or secure the base slot with concrete.

2. Use 46-grade anti-wear hydraulic oil (use anti-freeze 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 rust inhibitor to the recirculating water, and replace it promptly when the water quality deteriorates.

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

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.