The DYFJ-H2000 type valve testing bench is the fourth-generation valve pressure testing and detection equipment independently developed by Multiplus Hydraulics, based on years of production experience and in accordance with national standards and specifications.
The DYFJ-H2000 type valve test bench integrates electromechanical, hydraulic systems, pressure testing, and the storage and recycling of liquid media. It boasts complete functions, stable performance, and a high degree of automation. It is widely used for sealing face leakage testing and various performance tests such as shell strength (sand holes) on all types of high, medium, and low-pressure valves with nominal diameters of 1200-2000mm, with direct flange connections. Test media: water, gas, oil.
The equipment is driven by hydraulic power and controlled by electrical systems, 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 next-generation valve pressure testing equipment for valve manufacturing companies, users, and maintenance units.
DYFJ-H2000 type valve test bench working principle and structure
The DYFJ-H2000 type valve test bench operates by using valve flange positioning and a live jaw to clamp the back of the flange, ensuring that there are no external forces affecting the test results that could influence the valve testing, in compliance with national standard valve testing requirements.
The equipment is broadly categorized into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operating devices.
The equipment features a clamping-type design with each side of the workbench sealed with a blind plate. The hydraulic clamping jaws have axial extension and radial movement capabilities, directly driven by a hydraulic cylinder, ensuring even force distribution on the valve sealing surface and reliable clamping. When testing the butterfly valve, its sealing performance can be directly observed, facilitating checks for gas-tightness tests and observations of the valve sealing surface. It boasts good performance and a simple, compact structure.
Operating Instructions
1. Valve Mounting Method
Select a valve with a nominal bore diameter that matches the equipment model, turn on the power, and start the hydraulic system. Move the hydraulic jaw radially outward beyond the outer diameter of the test valve flange. Extend the hydraulic jaw axially beyond the valve length. Place the bottom flange of the valve against the test bench blind plate, aligning with the center opening. Radially move the jaw close to the valve flange, and axially move the jaw to ensure it abuts the front of the valve flange. At this point, the valve is securely clamped by the system, ensuring it does not wobble.
During the test of valve body strength, the opposite end of the valve is tightly sealed against the upper blind flange, aligned with the center hollow position. Radially move the clamping jaws close to the valve flange. Axially move the clamping jaws to ensure the jaws are firmly pressed against the back of the valve test blind flange. At this moment, the valve should be securely held by the clamping system and remain in a stable state.
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, for a 25 kg valve, adjust the pointer to 2.5 MPa). Open the main water inlet, left and right water inlets, close the air intake, and release the water and air 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, and 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. First, open the drain valve to relieve the water pressure inside the valve chamber, and then remove the valve.
3. Pressure Testing Methods (Bi-directional Intake, Venting)
The equipment does not come with a gas supply. The user must provide a separate gas source. Please consult the manufacturer before using high-pressure gases.
After the valve clamp is completed (using compressed air as an example, usually not exceeding 10 kg 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 is in a pressure-holding state.
Upon reaching the pressure-holding time, there are no issues with the valve. First, open the exhaust valve to release the pressure inside the valve chamber, then remove the valve.
Handling Instructions and Requirements
Ensure the equipment is level during installation or securely fix the anchor slots with concrete.
2. Use 46-grade anti-wear hydraulic oil (for temperatures below 0°C, use anti-freeze 46-grade anti-wear hydraulic oil). Ensure 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, and replace it promptly when the water quality deteriorates.
4. The equipment worktop 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 assuming their posts, adhere to standard procedures, and prioritize safety.
