The DYFJ-E1000 type valve testing bench is a fourth-generation valve pressure testing and inspection equipment independently developed by Duojia Hydraulics on the basis of many years of production experience, in accordance with national standards and specifications.

The DYFJ-E1000 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 automation. It is widely used for sealing surface leakage testing and shell strength (pores) testing of various high, medium, and low-pressure valves with nominal bore sizes of 600-1000mm, in the form of straight-through flanges. Test mediums: water, gas, oil.

The equipment is hydraulically driven and electrically controlled throughout the process, exerting no additional external forces on valves that could affect test results. This significantly enhances work efficiency and reduces labor intensity, making it the ideal new generation valve pressure testing equipment for valve manufacturing companies, users, and maintenance units.

DYFJ-E1000 Type Valve Test Bench Working Principle and Structure

The DYFJ-E1000 type valve test bench operates by locating the valve flange and clamping the back of the flange with live claws, ensuring that no external forces that could affect the test results are present during valve testing, in compliance with national standard requirements for valve testing.

The equipment is roughly divided into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operating devices.

The equipment is a horizontal-laying top-pressure type, with each workbench on the left and right sides sealed with blind flanges. The left workbench is equipped with an in/out function mechanism, directly driven by a hydraulic cylinder to ensure uniform force on the valve sealing surface and reliable clamping. The right workbench is fixed, allowing bidirectional water intake and drainage. The sealing disk features drainage and exhaust valves for convenient checks of the air-sealing test and observations of the valve sealing surface. It boasts good performance and a simple, compact structure.

Operating Instructions

1. Valve Mounting Method

Select a valve with the nominal diameter corresponding to the equipment model, turn on the power, and start the hydraulic system. Move the left-hand cylinder back to a position longer than the valve being tested. Place the valve flange face tightly against the right-hand workbench test blind plate, aligning with the center opening. Advance the left-hand movable frame towards the right-hand fixed workbench. The other end of the valve being tested is tightly pressed against the left-hand test blind plate, aligned with the center opening. The valve is overall in a horizontal position.

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

After the valve bracket is installed, refer to the "Pressure Comparison Table for Clamping Cylinder" to increase the gripping force of the hydraulic clamp to the required pressure. Adjust the electrical contact pressure gauge (for a 25 kg valve, adjust the pointer of the electrical contact pressure gauge to 2.5 MPa). Open the main water intake, left and right water intake valves, close the air intake, 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; 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 pressure maintenance state.

Upon reaching the pressure-holding time, the valve shows no issues. First, open the water discharge valve to relieve the 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 additional gas source. Please consult the manufacturer before using high-pressure gases.

After the valve fixture is complete (for example, using pressurized air, generally 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 highest pressure, and the equipment is in a pressure maintenance state.

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

Handling Instructions and Requirements

1. Ensure the equipment is level during installation or securely anchor the foot trough steel with concrete.

2. Use 46-grade anti-wear hydraulic oil (for temperatures below 0°C, use anti-freeze 46-grade anti-wear hydraulic oil), 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; replace the water 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 testing blind plate.

5. All moving parts of the test bench should be lubricated and kept clean for smooth operation.

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