The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that __________.
one valve seats upwards, while the other seats downwards
the reed valves used on the discharge are made substantially thicker and heavier than the suction valves
the suction valve springs exert a greater tension than the discharge valve springs
the discharge valve springs exert a greater tension than the suction valve springs
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