DYFJ-H600 Hydraulic Butterfly Valve Test Bench

The DYFJ-H600 valve test bench is the fourth-generation pressure testing and detection equipment independently developed by Duojia Hydraulics Co., Ltd., based on many years of production experience and in accordance with national standards and specifications.

The DYFJ-H600 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 surface leakage testing and other performance tests such as shell strength (pinhole) on various high, medium, and low-pressure valves with nominal diameters of 50-600mm, in the form of straight-through flanges. Test media: water, gas, oil.

The equipment is hydraulically driven and electrically controlled throughout the process, exerting no external force on the 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-H600 Valve Test Bench Working Principle and Structure

The DYFJ-H600 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 is a clamp-style design, with both sides of the workbench sealed with blind flanges. The hydraulic clamps feature axial extension and radial movement, directly driven by hydraulic cylinders for uniform sealing surface force and reliable clamping. During the test of the butterfly valve, the sealing performance can be directly observed, facilitating the inspection of air-tightness tests and the observation of the valve sealing surface. It boasts excellent performance and a simple, compact structure.

Technical Specifications

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 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 lower flange of the valve against the test bench blind flange, aligning with the center opening. Move the radial clamping jaw close to the valve flange, and the axial clamping jaw to ensure the jaw is flush with the valve flange face. At this point, the valve is securely held by the clamping system, ensuring it does not vibrate.

During the valve body strength test, the other end of the valve being tested is tightly sealed against the top test blind flange, aligned with the central hole. Radially move the clamp jaws close to the valve flange; axially move the clamp jaws to ensure the jaws are firmly pressed against the back of the valve test blind flange. At this moment, the valve should be securely held by the clamping system, maintaining an overall stable state.

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

After the valve mounting is complete, 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 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 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 water pressure holding state.

Upon reaching the pressure-holding time, the valve shows no issues. First, open the water discharge valve to release the pressure inside the valve chamber, and then remove the valve.

3. Pressure Test Methods (Bi-directional Inlet, 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 completed (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 maximum pressure, and the equipment is in a pressure-holding state.

Upon reaching the pressure-holding time, the valve is free of any issues. First, open the vent valve to release the pressure inside the valve chamber, then remove the valve.

Handling Instructions and Requirements

1. Align the equipment horizontally during installation or secure the anchor slots with concrete.

2. Use 46-grade anti-wear hydraulic oil (for temperatures below 0°C, use antifreeze 46-grade anti-wear hydraulic oil). The oil level must not be below the oil 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 anti-rust powder to the recirculating water, and replace the water promptly once 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 starting work, adhere to standard procedures, and prioritize safety.