The DYFJ-E300 type valve testing bench is the 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-E300 valve test bench integrates electromechanical, hydraulic systems, pressure testing, and liquid medium storage and recycling. It features complete functions, stable performance, and high level of automation. It is widely used for sealing surface leakage tests and other performance tests such as shell strength (pinholes) on various high, medium, and low-pressure valves with nominal diameters of 50-300mm and direct flange types. Test media: 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 an ideal new generation pressure testing and inspection equipment for valve manufacturing enterprises, users, and maintenance units.

DYFJ-E300 Valve Test Bench Operating Principle and Structure

The DYFJ-E300 type valve testing bench operates by using valve flange positioning and a live pawl to clamp the back of the flange, ensuring that no external forces that could affect the test results are applied to the valve testing, which complies with national regulations and standards for valve testing.

The equipment is broadly categorized into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operational devices.

The equipment is a horizontal-top-press type, with each side of the workbench sealed with a blind flange. The left workbench features an in/out function mechanism, directly driven by a hydraulic cylinder for even force distribution on the valve sealing surface and reliable clamping. The right workbench is stationary, with bidirectional water intake and drainage. The sealing disk is equipped with drainage and exhaust valves for convenient inspection of the gas-tightness test and observation of the valve sealing surface. It boasts good performance and a simple, compact structure.

Operation 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 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 to the right-hand fixed workbench, with the other end of the valve being tested pressed against the left-hand test blind plate, aligning with the center hole. The valve is overall in a horizontal position.

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

After the valve bracket is installed, refer to the "Clamping Cylinder Pressure Reference Table" 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 inlet, left and right water inlet valves, close the air inlet, drain water, and exhaust valve. 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; the high-pressure water pump will automatically stop when the water pressure reaches the set pressure on the electrical contact pressure gauge. The equipment enters the water pressure holding state.

Upon reaching the pressure-holding time, the valve has no issues. It is advisable to first open the water valve to relieve the water pressure inside the valve cavity before removing the valve.

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

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

After the valve mount is completed (for example, using pressurized air, generally 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 maximum pressure, and the equipment is in a pressure-holding 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 cavity, then remove the valve.

Handling Instructions and Requirements

1. Ensure the equipment is level during installation or secure the base channel 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 rust inhibitor to the recirculating water; change the water promptly when the water quality degrades.

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

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

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