Product Description: The DYFJ-AIOO type valve test bench is the fourth-generation valve pressure testing and detection equipment independently developed by Multiplus Hydraulics on the basis of many years of production experience, in accordance with national standards and specifications.
The DYFJ-AIOO type valve test bench integrates mechanical and electrical, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums. It features comprehensive functions, stable performance, and high automation. It is widely used for sealing surface leakage testing and various performance tests such as shell strength (pinhole) on high, medium, and low-pressure valves with nominal bore sizes of 15-100mm and direct flange types. Test mediums: water, gas, oil.
The equipment is hydraulically driven and electrically controlled throughout its process, exerting no additional external forces 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, users, and maintenance units.
DYFJ-AIOO type valve test bench working principle and structure
The DYFJ-AIOO 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 affecting the test results during 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 horizontal clamp design, with each side of the workbench sealed with a blind flange. The left workbench is equipped with an in/out mechanism, directly driven by a hydraulic cylinder, ensuring uniform force on the valve sealing surface and reliable clamping. (Left) The right workbench can be flipped 90 degrees for easy inspection of gas-tightness tests and observation of the valve sealing surface, boasting good performance and a simple, compact structure.
Technical Specifications
Pressure Chart
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 carriage back to a position longer than the valve being tested. Radially move the actuating clamp to exceed the outer diameter of the valve flange. Extend the clamp axially to exceed the thickness of the valve flange. Place the valve flange face tightly against the left workbench test blind plate, aligning with the center hole. Radially move the clamp close to the valve flange, and axially move the clamp to make it tightly adhere to the back of the valve flange. At this point, the valve should be securely clamped and fixed by the left clamping system, ensuring the valve does not fall off.
The left-hand moving bracket advances to the right-hand fixed workbench. The other end of the valve to be tested is tightly against the right-hand test blind flange, aligned with the central opening. Radially move the clamping jaws close to the valve flange. Axially move the clamping jaws to ensure they tightly adhere to the back of the valve flange. At this point, the valve should be securely held and fixed by the right-hand clamping system, with the valve in a horizontal position overall.
2. Water Pressure Testing Methods (Bi-directional Inflow, Drainage)
After the valve bracket 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 example, for a 25 kg valve, adjust the gauge pointer 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 is problem-free. First, open the drain valve to relieve the pressure inside the valve cavity, and then remove the valve.
3. Pressure Test Methods (Bi-directional Intake, Exhaust)
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 fixture is complete (for example, using pressure air, generally not exceeding 10 kg), open the inlet water and inlet gas valves, and close the outlet water and outlet gas valves. Close the inlet water and inlet gas valves when the pressure gauge reaches the highest pressure value, and the equipment is in a pressure maintenance state.
Upon reaching the pressure-holding time, the valve shows no issues. It should first be opened to release the air pressure inside the valve chamber before removing the valve.
Handling Instructions and Requirements
1. Align the equipment horizontally during installation or use concrete to secure the foot slot steel.
2. Use 46-grade anti-wear hydraulic oil (use anti-freeze 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 work surface of the equipment should be kept clean, and there should be no debris between the test valve flange and the test pressure blanking 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 standardized procedures, and prioritize safety.
