DYFJ-E300 Valve Test Bench

The DYFJ-E300 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-E300 valve test bench integrates mechanical and electrical systems, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums. It boasts complete functions, stable performance, and a high degree of automation. It is widely used for sealing surface leakage tests and various performance tests such as shell strength (pores) on straight-through flanged valves with nominal bore sizes of 50-300mm, ranging from high, medium, to low-pressure valves. Test media: water, gas, oil.

The equipment is hydraulically driven and electrically controlled throughout its 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 pressure testing and inspection equipment for valve manufacturing companies, users, and maintenance units.

DYFJ-E300 Type Valve Test Bench Working Principle and Structure

The DYFJ-E300 type valve test bench operates by positioning the valve flange and clamping the back of the flange with movable 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 generally 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 sealed with a blind flange. The left workbench is equipped with a reciprocating mechanism driven directly by a hydraulic cylinder, ensuring even force distribution on the valve sealing surface for reliable tightness. The right workbench remains stationary, allowing for bidirectional water intake and discharge. The sealing disk is fitted with drain and vent valves for convenient inspection of gas-tightness tests and observation of the valve sealing surface. It boasts excellent performance and a simple, compact structure.

Operation Instructions

1. Valve Mounting Method

Select a valve with the nominal bore size 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 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, aligning with the center hole. 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 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 fully filled with water. Start the high-pressure water pump; the pump will automatically stop when the water pressure reaches the pressure set on the electrical contact pressure gauge, and the equipment enters the water pressure holding state.

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

3. Pressure Testing Methods (Bi-directional Intake, Venting)

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 mounting is complete (for example, using compressed air, typically not exceeding 10 kg of pressure), open the water and air intake valves, and close the water and air exhaust 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, there are no issues with the valve. It should first be opened to release the air pressure inside the valve chamber, and then the valve should be removed.

Cautionary Instructions and Requirements

1. Ensure the equipment is level during installation or use concrete to secure the foot slot steel.

2. Choose 46-grade anti-wear hydraulic oil (use antifreeze 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 no debris is allowed between the valve flange being tested and the 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.