Influencing factors and discussion on the life reduction of one-way valve spring

Since the stiffness of the active spring is larger than that of the original spring, under the installation conditions (spring pre-compression), the actual maximum and minimum working load of the spring seriously deviate from the standard load working range, which becomes the basis for the short service life of the spring. the reason.

The high speed of the ammonia pump causes the service life of the spring to decrease. The actual situation shows that when the speed of the ammonia pump exceeds 180r/n, the average service life of the current spring is only 2 weeks. The main reason is: as the speed increases, the moving speed of the plunger and the check valve spool will increase, the inertia force of the one-way spool will increase, and the corresponding spring working stroke will increase, eventually leading to the one-way valve spring. The maximum working load is increased, so that the working load of the spring is further deviated from the standard working range, so the service life is further reduced.

Specific treatment measures: Turn the outlet check valve spring support to face down 5, that is, reduce the spring installation pre-compression amount to 10. Under normal draining conditions, the maximum displacement of the spring is 5, so the maximum compression of the spring will decrease. It can be seen that by reducing the amount of preloading of the spring mounting, the actual maximum and minimum working loads of the spring are fully adjusted to within the working load range of the spring standard.

Since the calculation results of the inlet and outlet springs are the same, the same adjustment method is adopted, that is, the support spring of the inlet spring is turned to face 5, which can realize the reasonable adjustment of the pre-compression amount of the inlet spring. Improve the operating efficiency of the high-pressure ammonia pump and reduce the speed of the ammonia pump to improve the service life of the spring. The main means: to prevent the one-way valve static seal leakage, pump outlet safety valve leakage, outlet sub-line valve leakage and check valve sealing surface damage leakage. If there is a leak, take immediate measures to solve it (especially the one-way valve static seal leakage). Otherwise, the increase of the pump speed will cause a vicious cycle, resulting in a decrease in the service life of the spring and the check valve, and even serious damage to the sealing surface of the cylinder.

Treatment measures Due to the actual maximum working load of the existing spring, the actual working load distribution of the existing spring is unreasonable, which is the main reason for the low service life of the spring. In addition, the high speed of the ammonia pump will also reduce the service life of the spring. On February 1, 2003, the high-pressure ammonia pump inlet and outlet check valve was reduced in the way of installing the pre-compression amount of the spring, and the working load of the spring was adjusted. At the same time, the operation efficiency of the ammonia pump was improved by strengthening the maintenance and repair to reduce the pump. Running speed.

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