DYFJ-E200 type valve testing bench

The DYFJ-E200 valve testing bench is the fourth-generation pressure testing and inspection equipment independently developed by Duojia Hydraulics, based on years of production experience and in accordance with national standards and specifications.

The DYFJ-E200 valve test bench integrates mechanical, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums. It boasts comprehensive functions, stable performance, and high automation. It is widely used for sealing face leakage testing and various performance tests such as shell strength (pores) on straight-through flanged high, medium, and low-pressure valves with nominal diameters of 15-1200mm. Test mediums: water, gas, oil.

The equipment is fully powered by hydraulic drive and electric control, with no external forces affecting the valve's test results, greatly enhancing work efficiency and reducing labor intensity. It is an ideal new generation pressure testing and inspection equipment for valve manufacturing companies, users, and maintenance units.

DYFJ-E200 type valve test bench working principle and structure

The DYFJ-E200 valve test bench operates by positioning the valve flange and clamping the back of the flange with live claws, ensuring no external forces affecting the test results that could influence the 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 features a horizontal卧式顶压 design, with each side of the workbench equipped with a sealed blind plate. The left workbench is fitted with an in/out function mechanism, directly driven by a hydraulic cylinder, ensuring uniform force distribution on the valve sealing surface and reliable clamping. The right workbench is stationary, allowing for bidirectional water intake and drainage. The sealing disc is equipped with drainage and exhaust valves, facilitating the inspection of gas-tightness tests and observation of the valve sealing surface. It boasts good performance and a simple, compact structure.

Operation instructions

Valve Mounting Method

Select a valve with a nominal diameter that matches 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 against the right-hand workbench test blind plate, aligning with the center opening. Advance the left-hand moving frame to 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 opening. The valve is in an overall horizontal position.

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

After the valve clamp is installed, 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 gauge pointer to 2.5 MPa). Open the main water inlets, left and right water inlets, 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 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 shows no issues. It is recommended to first open the drain valve to release the water pressure inside the valve chamber before removing the valve.

3. Pressure Test Methods (Bi-directional Intake and Venting)

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

After the valve mounting is completed (for example, using compressed air, usually not exceeding 10 kg of pressure), 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 will be in a pressure maintenance state.

Upon reaching the pressure-holding time, the valve is free of any issues. It should first be opened to release the pressure inside the valve chamber before removing the valve.

Cautionary Instructions and Requirements

1. Align the equipment horizontally during installation or secure the foot slot steel with concrete.

2. Use 46-grade anti-wear hydraulic oil (for temperatures below 0°C, use antifreeze 46-grade anti-wear hydraulic oil). The oil level must not be below the indicator'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 anti-rust powder 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 no debris is allowed between the valve flange under test and the pressure test blind 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 starting work, adhere to standard procedures, and prioritize safety.