DYFJ-E1200 Type Valve Test Bench

The DYFJ-E1200 type valve test bench is the fourth-generation valve pressure testing and detection equipment independently developed by Duojia Hydraulics, based on years of production experience and in accordance with national standards and specifications.

The DYFJ-E1200 valve test bench integrates mechanical and electrical, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums. It boasts comprehensive functions, stable performance, and high levels of automation. It is widely used for sealing surface leakage tests and other performance tests, such as shell strength (sand holes), on various high, medium, and low-pressure valves with nominal bore diameters of 800-1200mm and direct flanged designs. Test mediums: water, gas, oil.

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

DYFJ-E1200 Type Valve Test Bench Working Principle and Structure

The DYFJ-E1200 type valve test bench operates by positioning the valve flange and clamping the back of the flange with movable claws, ensuring no external forces that could affect the test results, in compliance with national standard valve testing requirements.

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

The equipment is a horizontal top-pressed type. Both left and right workbenches are sealed with blind flanges. The left workbench is equipped with a forward and reverse mechanism, directly driven by a hydraulic cylinder to ensure even force distribution on the valve sealing surface and reliable tightness. The right workbench is stationary, featuring bidirectional water intake and drainage. The sealing disk is fitted with drainage and exhaust valves for convenient checks of the air-sealing test and observations of the valve sealing surface. It boasts excellent performance and a simple, compact structure.

Operation Instructions

1. Valve Mounting Method

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

2. Water Pressure Testing Methods (Bidirectional Inflow and Drainage)

After the valve mount is completed, refer to the "Clamping Cylinder Pressure Chart" to increase the hydraulic clamp force to the required pressure. Adjust the electrical contact pressure gauge (for example, with 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 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 a water pressure maintenance state.

Upon reaching the pressure-holding time, there are no issues with the valve. First, open the water valve to release the water pressure inside the valve cavity, then remove the valve.

3. Pressure Testing Methods (Bi-directional Inlet, Exhaust)

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 complete (for example, using pressure air, usually 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-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

Ensure the equipment is level during installation or secure the anchor flange with concrete.

2. Choose 46-grade anti-wear hydraulic oil (use frost-proof 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; replace the water 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 testing 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 prior to assuming their positions, adhere to standardized procedures, and prioritize safety.