1. There is a problem with the oil circuit (the oil pipe connection is wrong or the oil pressure machine lacks oil and oil leakage). 2. There are debris in the cylinder (the debris in the oil is brought in) 3. Solenoid valve problem (piston stuck or signal source failure). 4. The inner piston seal is damaged. 5. The hot runner system leaks. Because it is the old system maintenance, the mold size problem can be ignored, and the problems 2 and 3 appearing in normal production are more likely! When arriving at the customer, the guest has opened the C plate of the mold and the hot runner system is sealed. So I suggested that he check the hot runner problem first, and then no longer have to install the mold - try. Since the fifth point has been eliminated, it is now important to check 2 and 4, and it is found that the seal is intact but there are many impurities in the cylinder, which is inferred to be brought in from the oil passage (recommended to clean the oil passage to increase the filter). After excluding the 2 and 4 problem points, after the mold is reinstalled, the test temperature and the test valve needle action are all ok, and the next work can be tested. The two valve needle movements are still abnormal during the test. The inspection found that the valve needle did not move at all, because the solenoid valve was out of order, and finally recommended that the customer use our solenoid valve, and the test model ok customer is very recognized (quality after-sales service to solve the customer's urgency)! Kitchen Sink Faucets,Touch Kitchen Faucet,Retractable Kitchen Faucet,Black Steel Hose Faucet Yuyao Zelin Sanitary Ware Co., Ltd , https://www.zelinfaucets.com