这是指调整节流调节部分，出油腔流量不发生变化，其主要原因是阀芯径向卡住和节流调节部分发生故障等。主要原因是锁紧装置松动，节流口部分堵塞，油温升高，进、出油腔最小压差过低和进、出油腔接反等。因此在使用时要注意进、出油腔的位置，避免接反。联系人：蔡韵
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