The YFJ-B50 Valve Test Bench is the fourth-generation 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-B50 valve test bench integrates mechanical and electrical, hydraulic systems, pressure testing, and storage and recycling of liquid mediums. It boasts complete functions, stable performance, and high degree of automation. It is widely used for sealing surface leakage tests and shell strength (pores) tests on various high, medium, and low-pressure valves with nominal diameters of 15-50mm, in direct flange style. The testing mediums include water, gas, and oil.

The equipment is hydraulically driven and electrically controlled throughout its entire process, exerting no additional external force on valves that could affect test results. This significantly enhances work efficiency and reduces labor intensity, making it the ideal new generation pressure testing equipment for valve manufacturing companies, users, and maintenance units.

DYFJ-B50 type valve test bench working principle and structure

The DYFJ-B50 type valve test bench operates by using valve flange positioning and a movable claw to clamp the backside of the flange, ensuring that no external forces that could influence the test results affect the valve testing, in compliance with the national standard requirements for valve testing.

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

The equipment features vertical top pressure with both the upper and lower workbenches sealed with blind flanges. The upper workbench is equipped with a reciprocating mechanism, directly driven by a hydraulic cylinder, ensuring uniform force on the valve sealing surface for reliable tightness. The lower workbench is stationary, allowing bidirectional water intake and drainage. The sealing disk is fitted with drainage and vent valves for convenient checks during gas-tightness tests and observations of the valve sealing surface. It boasts good performance and a simple, compact structure.

Operation Instructions

1. Valve Mounting Method

Select a valve with a nominal bore size that matches the equipment model, turn on the power, and start the hydraulic system. Move the upper cylinder back to a position longer than the valve being tested. Place the valve flange face tightly against the lower workbench test blind plate, aligning with the center opening. Lower the upper moving frame towards the fixed lower workbench, positioning the other end of the valve being tested against the lower 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 mounting is complete, refer to the "Clamping Cylinder Pressure Reference Table" 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 intake, upper and lower water intake valves, close the air intake, and release water and air valves. Start the low-pressure water pump, observe the movement of the 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 pump will automatically stop when the water pressure reaches the pressure set on the electrical contact pressure gauge, and the equipment enters a 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 chamber, then remove the valve.

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

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

After the valve mount is completed (for example, using compressed air, generally not exceeding 10 kg of pressure), open the water and air inlet valves, and close the water and air exhaust valves. Close the water and air inlet 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. Align the equipment horizontally during installation or secure the anchor slots with concrete.

2. Select 46-grade anti-wear hydraulic oil (use anti-freeze 46-grade anti-wear hydraulic oil below 0℃), ensuring oil level is not 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, and replace it 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 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 before taking up their posts, adhere to standard procedures, and prioritize safety.