1. Test items

It is mainly used for commutation ability test, action voltage test and detection of internal leakage of maximum and minimum action pressure under minimum action voltage of specifications of type 4, 7, 9, four-way valve; Test items can be combined as necessary. One-time setup can actively test all items, or select individual items for testing.

2. Test gas source

Clean compressed air or nitrogen.

3. Test parameters

Maximum action voltage test pressure range: 2.0Mpa-3.5Mpa adjustable (air source customer-supplied)

Minimum commutation pressure test pressure range: 0.15Mpa-0.30Mpa adjustable

Action voltage test pressure range: 1.0Mpa-2.0Mpa adjustable

Leak test pressure: 0.98-1.0Mpa

Leakage range: 500-2500ml/min

Coil voltage adjustment range: 100VAC-230VAC, 50HZ

4. Test method

A. Maximum action pressure test: The reversing coil is loaded with 85% of the rated voltage, and the air inlet of the D pipe of the tested four-way valve is loaded with the rated maximum action test pressure. When the pressure of the S pipe is atmospheric pressure, continue to test for three times, and test the reversing ability.

B. Minimum action pressure test: The reversing coil is loaded with 85% of the rated voltage, and the air inlet of the D pipe of the tested four-way valve is loaded with the rated minimum action test pressure. When the pressure of the S pipe is atmospheric pressure, continue to test for three times, and test the reversing ability.

C. Action voltage test: Minimum action pressure test: The reversing coil is loaded with 85% of the rated voltage, the air inlet of the D pipe of the tested four-way valve is loaded with 1.47mpa pressure, and the reversing frequency is 10 times / min, and the 10 cycles are continued to test the reversing ability.

D. Internal leakage test: When the air inlet of the D pipe of the tested four-way valve is loaded with 1.0MPa pressure and the pressure of the S pipe is atmospheric pressure, test the internal leakage of the tested valve. If the leakage does not exceed the standard, the reverse internal leakage test shall be carried out.