Product Description:
The DYFJ-A200 valve test bench is the fourth generation pressure testing and inspection equipment independently developed by Duojia Hydraulic Co., Ltd., based on many years of production experience and in accordance with national standards and specifications.
The DYFJ-A200 valve test bench integrates mechanical, hydraulic systems, pressure testing, and liquid medium storage and recycling into one, featuring comprehensive functions, stable performance, and high degree of automation. It is widely used for sealing face leakage tests and various performance tests such as shell strength (pores) on direct-connection flanged valves of various high, medium, and low pressures with nominal diameters of 50-200mm. Test media: water, air, oil.
The equipment is hydraulically driven and electrically controlled throughout its process, exerting no additional external force on valves that could affect test results, significantly enhancing work efficiency and reducing labor intensity. It is the ideal new generation pressure testing and inspection equipment for valve manufacturing enterprises, users, and maintenance units.
DYFJ-A200 type valve test bench working principle and structure
The DYFJ-A200 type valve test bench operates by positioning the valve flange and clamping the back of the flange with a live paw, ensuring that there are no external forces affecting the test results that could influence the valve testing, in compliance with national standard requirements for valve testing.
The equipment is broadly categorized into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operational devices.
The equipment features a horizontal clamping design with each side of the workbench sealed with a blind flange. The left workbench is equipped with a reciprocating mechanism, directly driven by a hydraulic cylinder, ensuring even force distribution 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.
Operation Instructions
1. 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 carriage back to a position longer than the valve being tested. Radially move the movable jaw to exceed the outer diameter of the valve flange. Extend the jaw axially to exceed the thickness of the valve flange. Place the valve flange face tightly against the left-hand workbench test blind plate, aligning with the center hole. Radially move the jaw close to the valve flange, and axially move the jaw 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-hand clamping system, ensuring the valve does not fall off.
The sliding bracket moves to the right fixed workbench, the other end of the valve being tightly pressed against the right pressure test blank flange, aligned with the center opening. Radially move the clamping jaws close to the valve flange. Axially move the clamping jaws to make the jaws tightly adhere to the back of the valve flange. At this point, the valve should be securely held by the right-side clamping system, with the valve in an overall horizontal position.
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's gripping 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, 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; when the water pressure reaches the pressure set on the electrical contact pressure gauge, the high-pressure water pump automatically stops, and the equipment enters the pressure holding state.
Upon reaching the pressure-holding time, the valve has no issues. It should first be opened 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 a separate gas source. Please consult the manufacturer before using high-pressure gases.
After the valve mounting is complete (for example, using compressed air, typically 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 highest pressure, and the equipment will be in a pressure maintenance state.
Upon reaching the pressure holding time, there should be no issues with the valve. First, open the exhaust valve to release the pressure within the valve chamber before removing the valve.
Handling Instructions and Requirements
1. Ensure the equipment is level during installation or use concrete to secure the anchor slot steel.
2. Use 46-grade anti-wear hydraulic oil (select antifreeze 46-grade anti-wear hydraulic oil below 0℃), ensuring the oil level does not fall below the indicator. Regularly check the oil level and hydraulic oil. After one year of use, clean the oil tank and replace the hydraulic oil.
3. Add anti-rust powder to the recirculating water and replace it 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 valve flange being tested and the pressure test blind plate.
5. Add lubricant to all moving parts of the testing bench to ensure clean and smooth operation.
6. Operators must undergo professional training before starting work, adhere to standardized procedures, and prioritize safety.
