Device for activity test of extraction check valve

A device for an activity test of an extraction check valve, comprising:

• a main valve;
• a first auxiliary valve;
• a second auxiliary valve;
• a valve body;
• and
• a filter;
• wherein the main valve, the first auxiliary valve and the second auxiliary valve are mounted on the valve body, and the valve body is provided with an air inlet, a cylinder port and an air discharging port, the air inlet is in communication with the main valve through a first air passage, the cylinder port is sequentially in communication with the second auxiliary valve, the first auxiliary valve and the main valve through a second air passage, and the air discharging port is sequentially in communication with the second auxiliary valve, the first auxiliary valve and the main valve through a third air passage;
• the main valve and the second auxiliary valve are solenoid valves, and the first auxiliary valve is a hand-operated valve;
• an air outlet of the filter is in communication with the air inlet, and the filter is used for filtering out impurities in gas.