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Correct operation of valve test bed

Jun. 27, 2019

Correct operation of valve test bed:

People at the beginning of the vertical valve test bed do not know the correct operation of the valve test bed, then let the following small make up to introduce it to you!

  • 1. install valve

Place the valve under test on the sealing disc under the workbench.

  •  2. clamping valve: the clamping mode of flange connection valve

(1), the plane seal disk installed.

(2), put the sealing ring in the plane sealing disk.

(3) put the valve under test on the seal disc and find the correct position.

(4), press "clamp" button, with "pressure adjustment" knob clamp valve.

  • 3. waterway connection of vertical valve test bed

Connect the water inlet of the equipment with the water source with randomly equipped water pipes, turn on the water source switch and fill the water tank. When the water tank is full, the water will flow out of the overflow port and close the water source

  •  4. operation of circuit and oil circuit of vertical valve test bed

1. Switch on the power.

2. After closing the air and turning on, the power indicator light will be on.

3. Loosen the "pressure adjustment" knob counterclockwise and press the "pump start" switch to start the oil pump; At this point, you can do other actions.

4. After each cylinder action, in order to reduce the hydraulic impact, the "pressure adjustment" knob should be rotated counterclockwise every time to make the reading of "system pressure" meter less than 2MPa.

5. "sealed cylinder" has hydraulic control one-way valve. After pressing "release" button, it cannot immediately change direction, but needs to rotate the "pressure adjustment" knob clockwise, so that the pressure of oil circuit system exceeds a certain value (generally 2-3mpa), and then the action will start.

6, rotate the "pressure adjustment" knob, the action must be slow, otherwise it will cause impact, pressure gauge reading rise too fast.

Safety Valve Tightness Test Bench

Valve airtight (airtight) test on vertical valve test stand

1. Valve sealing test

(1). The measured valve is clamped, and the value of "sealing pressure" is calculated according to different valve sizes and pressures according to the "pressure comparison table and calculation formula".

(2) open the pressure relief valve, open the low pressure pump switch, to the water from the hydraulic outlet, close the pressure relief valve to the pressure gauge pointer to start the action, close the low pressure pump.

(3). Close the valve opening and closing parts.

(4). Press the "boost on" switch, and then turn the "pressure adjustment" knob clockwise, so that the reading of the test pressure gauge reaches the value to be tested, turn on the "pressure keeping timing" switch, and the time relay starts to timing, and after the set time, the "hum" starts to alarm. (according to GB4981 and iso5208-1982 standards, the test pressure should be equal to 1.1 times of the maximum allowable working pressure at 20℃. According to zbj16006-90 standard, the test pressure should be equal to 1.1 times of the nominal pressure at 38℃. (low pressure and small diameter valve should be matched with the "boost speed" knob, which should rotate counterclockwise to the minimum before pressing).

(5). we judge whether the valve under test is qualified by the pressure drop during the test duration. There are two test pressure gauges on the operation panel, one with a full range of 10MPa and the other with a full range of 60MPa. The use of two tables is beneficial to improve the measuring accuracy at low pressure. But must pay attention to: when the test pressure is greater than 6MPa, must be the low pressure meter switch closed, in order to prevent the low pressure meter broken.

(6). Open the "pressure relief switch", make the test gauge back to zero. Then turn the "pressure adjustment" knob counterclockwise to make the system pressure less than 0.5mpa.

(7). Press "release" button, clockwise rotation "pressure adjustment" knob, will be measured valve release, and then counterclockwise rotation "pressure adjustment" knob, make the system pressure less than 0.5MPa.

(8). We take the measured valve. This completes the testing of a valve.

2. Test the valve shell strength and upper sealing performance

(1). According to the measured valve size, type of connection to choose the appropriate sealing disc.

(2). Put the tested valve on the lower sealing disc and align it. Then press the "clamping" button to clamp the valve under test, and the clamping force is calculated according to the comparison table and formula.

(3). Unscrew the valve opening and closing parts; Open the left pressure relief to inject water into the measured valve until water flows out from the pressure relief hole. Then close the relief valve.

(4). The test procedure is the same as that of "valve sealing test".

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