The DYFJ-E100 type valve testing bench is the fourth generation pressure testing and detection equipment developed independently by Duojia Hydraulic Co., Ltd., based on many years of production experience, in accordance with national standards and specifications.
The DYFJ-E100 valve test bench integrates mechanical, hydraulic systems, pressure testing, and the storage and recycling of liquid media. It features comprehensive functions, stable performance, and high levels of automation. It is widely used for sealing surface leakage tests and other performance tests such as shell strength (pores) on various high, medium, and low-pressure valves with nominal diameters of 15-100mm and direct flanged designs. Test media: water, gas, oil.
The equipment is hydraulically driven and electrically controlled throughout the entire process, exerting no additional external force on valves that would affect test results, significantly enhancing work efficiency and reducing labor intensity. It is an ideal new generation pressure testing and inspection equipment for valve manufacturing enterprises, users, and maintenance units.
DYFJ-E100 Type Valve Test Bench Working Principle and Structure
The DYFJ-E100 type valve test bench operates by positioning the valve flange and clamping the back of the flange with a live paw, ensuring no external forces that could affect test results, in compliance with national standard valve testing requirements.
The equipment is roughly divided into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operating devices.
The equipment features a horizontal-laying, top-press design. Both workbenches are sealed with blind flanges, with the left workbench equipped with a forward and reverse mechanism, directly driven by a hydraulic cylinder to ensure uniform force distribution on the valve sealing surface and reliable clamping. The right workbench is stationary, allowing for bidirectional water intake and drainage. The sealing disc is fitted with drainage and exhaust valves, facilitating the inspection of air-sealing 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 a nominal bore size corresponding to the equipment model, turn on the power, and start the hydraulic system. Move the left-hand cylinder back until it is longer than the valve being tested. Place the valve flange face tightly against the right-hand workbench test blind plate, aligning with the center opening. 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 opening. The valve is in a horizontal position overall.
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 force to the required pressure. Adjust the electrical contact pressure gauge (for example, with a 25 kg valve, adjust the pointer of the electrical contact pressure gauge to 2.5 MPa). Open the main water intake, left and right water intake valves, close the air intake, drain, and vent 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 the pressure maintenance state.
Upon reaching the pressure-holding time, the valve has no issues. First, open the water discharge valve to relieve the pressure inside the valve cavity, and 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 a separate gas source. Please consult the manufacturer before using high-pressure gases.
After the valve fixture is completed (for example, using compressed air, generally not exceeding 10 kg), 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 maintenance state.
Upon reaching the pressure holding time, there are no issues with the valve. It should be first opened to release the pressure inside the valve cavity before removing the valve.
Use Instructions and Requirements
Ensure the equipment is level or anchor the footer channel steel with concrete during installation.
2. Use 46-grade anti-wear hydraulic oil (for temperatures below 0°C, use antifreeze 46-grade anti-wear hydraulic oil), 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 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 prior to starting work, adhere to standardized procedures, and prioritize safety.
