The valves are driven with identical but out-of-phase grid signals. When one grid goes positive, the other goes negative. When one valves conducts more, the other conducts less: one pushes, the other pulls. The output signal developed in the transformer is the difference between the two AC currents.
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The check valve opens under the inflated air pressure [...] and the air can stream into the child seat. Check valve installed on only the back wheel and other parts, the first plane should be aligned so that...
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