The DYFJ-H1200 valve testing bench is the fourth-generation pressure testing and inspection equipment independently developed by Duojia Hydraulics, based on many years of production experience and in accordance with national standards and specifications.

The DYFJ-H1200 type valve test bench integrates mechanical and electrical, hydraulic systems, pressure testing, and the storage and recycling of liquid media. It features comprehensive functions, stable performance, and high degree of automation. It is widely used for sealing surface leakage tests and other performance tests, such as shell strength (pinhole) for various high, medium, and low-pressure valves with nominal bore sizes of 300-1200mm and direct flange connections. Test media: water, gas, oil.

The equipment is fully powered by hydraulic drive and electric control, exerting no additional external force on the valves that could affect test results. This significantly enhances work efficiency and reduces labor intensity, making it the ideal new generation pressure testing equipment for valve manufacturing enterprises, users, and maintenance units.

DYFJ-H1200 Type Valve Test Bench Working Principle and Structure

The DYFJ-H1200 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 affect the test results, thereby meeting the national standard requirements for valve testing.

Equipment is generally divided into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operating devices.

The equipment features a clamp-type design, with both sides of the workbench sealed with blind plates. The hydraulic clamp has axial extension and radial movement capabilities, directly driven by a hydraulic cylinder, ensuring even force distribution on the valve sealing surface and reliable clamping. During butterfly valve testing, the valve's sealing performance can be directly observed, facilitating the inspection of air-tightness tests and the observation of the valve sealing surface. It boasts good performance and a simple, compact structure.

Technical Specifications

Operation Instructions

1. Valve Mounting Method

Select a valve with a nominal diameter that matches the equipment model, turn on the power, and start the hydraulic system. Move the hydraulic clamping jaw radially to exceed the outer diameter of the test valve flange, and extend the axial movement of the clamping jaw to exceed the valve length. Place the bottom flange of the valve against the workbench test blind plate, aligning with the center opening. Move the radial clamping jaw close to the valve flange, and move the axial clamping jaw to ensure the jaw is tightly against the valve flange face. At this point, the valve is securely held by the clamping system, ensuring the valve does not vibrate.

When testing the strength of the valve body, the opposite end of the valve is tightly sealed against the top pressure blind plate, aligned with the central hollow. Radially move the clamping jaws close to the valve flange, and axially move the clamping jaws to ensure they tightly adhere to the back of the valve pressure blind plate. At this moment, the valve should be securely gripped and fixed by the clamping system, with the valve in a stable condition overall.

2. Water Pressure Testing Methods (Double-way Inflow, Drainage)

After the valve mount is completed, refer to the "Clamping Cylinder Pressure Comparison Table" to increase the hydraulic clamp's gripping force to the required pressure. Adjust the electrical pressure gauge (for example, with a 25 kg valve, adjust the gauge needle to 2.5 MPa). Open the main water inlet, left and right water inlets, close the air intake, drain, and vent valves. Start the low-pressure water pump, observe the movement of the pressure gauge needle. When the needle 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 pressure gauge, and the equipment will enter the pressure-holding state.

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

3. Pressure Testing Methods (Bi-directional Intake, Exhaust)

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 pressure air, generally not exceeding 10 kg), open the inlet and air inlet valves, and close the drain and air release valves. Close the inlet and air inlet 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 shows no issues. It is recommended to first open the vent valve to release the pressure inside the valve chamber before removing the valve.

Handling Instructions and Requirements

1. Ensure the equipment is level during installation or secure the base channel with concrete.

2. Select 46-grade abrasive-resistant hydraulic oil (use antifreeze 46-grade abrasive-resistant hydraulic oil below 0℃), ensuring the oil level does not fall below the gauge's minimum mark. 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 equipment work surface should be kept clean, and there should be no debris between the valve flange under test and the pressure test 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 positions, adhere to standardized procedures, and prioritize safety.