The DYFJ-E800 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-E800 type valve testing bench integrates mechanical, hydraulic systems, pressure testing, and storage and recycling of liquid mediums into one, featuring complete functions, stable performance, and high level of automation. It is widely used for sealing face leakage testing of various high, medium, and low-pressure valves with nominal bore sizes of 400-800mm, as well as for shell strength (sand hole) and other performance tests. Test media: water, gas, oil.

The equipment is fully hydraulically driven and electrically controlled, exerting no additional external force on the 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 and maintenance units.

DYFJ-E800 Type Valve Test Bench Working Principle and Structure

The DYFJ-E800 valve test bench operates by positioning the valve flange and clamping the back of the flange with a live paw, ensuring no external forces affect the test results, thereby meeting the national standard requirements for valve testing.

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-pressing type, with each side of the workbench sealed with a blind flange. The left workbench is equipped with a forward and reverse mechanism, directly driven by a hydraulic cylinder, ensuring uniform force distribution on the valve sealing surface and reliable clamping. The right workbench is stationary, featuring bidirectional water intake and drainage. The sealing disk is fitted with drainage and exhaust valves for convenient checking of the air-tightness test and observation of the valve sealing surface. It boasts excellent performance and a simple, compact structure.

Operation Instructions

Valve Mounting Method

Select a valve with a nominal bore 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 tested valve. Place the valve flange face tightly 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 tested valve pressed against the left-hand test blind plate, aligning with the center opening. The valve is in a horizontal position overall.

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

After the valve clamp is installed, refer to the "Clamping Cylinder Pressure Comparison 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 inlets, 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 set pressure on the electrical contact pressure gauge. The equipment then enters the water pressure maintenance state.

Upon reaching the pressure-holding time, the valve is problem-free. First, open the drain 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 its own gas supply. The user must provide a separate gas source. Please consult the manufacturer before using high-pressure gases.

After the valve clamp is complete (using compressed air as an example, usually not exceeding 10 kg of pressure), 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, 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 can be removed.

Cautionary Instructions and Requirements

1. Align the equipment horizontally during installation or secure the base channel with concrete.

2. Use 46-grade anti-wear hydraulic oil (use antifreeze 46-grade anti-wear hydraulic oil below 0℃), ensuring oil level does not fall below the gauge's lower limit. Regularly check oil levels 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 valve flange under test and the pressure test blank flange.

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

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