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to suck and discharge the refrigerant. If the valve block is broken, the refrigerant can not be
discharged, and hence no refrigerating can be achieved.
Method for making judgment
It is quite difficult to differentiate this trouble from others because they often have similar symptoms. In
repairing, firstly, hear attentively if there is some abnormal sound coming from the compressor
(sometimes , the broken pieces of valve block may strike against the cylinder), and feel the
compressor casing with your hand to ascertain whether it is too hot, this is also helpful to the
troubleshooting; secondly, measure the pressures at the high and low pressure ports of the
compressor with pressure gauges, if the gas suction valve block is broken, the suction pressure gauge
pointer will swing violently and the suction pressure is very high, whereas when the gas discharge
valve block is broken , the discharge pressure gauge pointer will swing drastically and the discharge
pressure is very high. In the both cases, stop the compressor at once, and if technique is available,
open the cylinder cover and check up the valve block, repair it, or replace it with a new one.
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