The DYFJ-A1200 valve testing bench is the fourth-generation pressure testing and inspection equipment independently developed by Duojia Hydraulics, based on years of production experience and in accordance with national standards and specifications.

The DYFJ-A1200 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 tests and shell strength (pores) tests on various high, medium, and low-pressure valves with nominal diameters of 600-1200mm, in the form of straight-through flanges. 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 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-A1200 Type Valve Test Bench Working Principle and Structure

The DYFJ-A1200 valve test bench operates by positioning the valve flange and clamping the back of the flange with live claws, ensuring no external forces affecting the test results that could compromise 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 operating 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 driven directly by a hydraulic cylinder, ensuring even force distribution on the valve sealing surface and reliable tightness. (Left) The right workbench can be flipped 90 degrees for easy inspection of gas-tightness tests and observation of the valve sealing surface, featuring good 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 carriage back to a position longer than the valve being tested. Radially move the movable jaw to a diameter larger than the outer diameter of the valve flange. Extend the jaw axially to a length greater than the thickness of the valve flange. Place the valve flange face tightly against the left-hand workbench trial blind plate, aligning with the center opening. Radially move the jaw close to the valve flange, and axially move the jaw to make it tightly against the back of the valve flange. At this point, the valve should be securely held by the left-hand clamping system to ensure it does not fall off.

The sliding bracket moves to the right fixed workbench, the other end of the valve to be tested is 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 and fixed by the right-side clamping system, with the valve in a horizontal position.

2. Water Pressure Testing Methods (Bi-directional Inflow, Drainage)

After the valve bracket is installed, refer to the "Clamping Cylinder Pressure Comparison 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 gauge pointer to 2.5 MPa). Open the main inlet, left, and right inlet valves, close the air inlet, drain, and vent 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; the pump will automatically stop when the water pressure reaches the set pressure on the electrical contact pressure gauge. The equipment then enters the water pressure maintenance state.

Upon reaching the pressure-holding time, there are no issues with the valve. First, open the water valve to relieve the pressure inside the valve chamber, and then remove the valve.

3. Pressure Testing Methods (Bidirectional 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 intake valves, and close the water and air exhaust valves. Close the water and air intake valves when the pressure gauge reaches the highest pressure, and the equipment is in a pressure maintenance state.

Upon reaching the pressure-holding time, the valve is problem-free. First, open the vent valve to release the pressure inside the valve cavity, then remove the valve.

Instructions and Requirements for Use

Ensure the equipment is level during installation or secure the foot slot steel with concrete.

2. Use 46-grade anti-wear hydraulic oil (use antifreeze 46-grade anti-wear hydraulic oil below 0℃), ensuring the oil level is not 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 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 standard operations, and prioritize safety.