## 5 Conclusions  
This study investigated the Bernoulli effect in the valve gap and its impact on the dynamics of the suction valve in reciprocating compressors. A three-dimensional FSI model was established and verified by experiments. Based on the FSI model, the main factors affecting the Bernoulli effect in the valve gap were determined by varying the parameters, such as the rotation speed of the compressor and the height of the limiter. Some conclusions can be drawn as follows:  
1. Based on the FSI model, the Bernoulli effect in the valve gap was proven to exist and have a significant effect on the pressure distribution in the valve gap;
2. Although the Bernoulli effect in the valve gap hinders the rapid opening of the valve to some extent, it is obviously beneficial to the timely closure of the valve;
3. Because of the Bernoulli effect, a high rotation speed of the compressor is conducive to the timely closing of the valve. However, if the speed is excessively high, the flow area of the valve will be insufficient, which will cause the valve to reopen and prolong the delayed closure time of the valve;
4. There is an optimal height for the limiter. When the limiter height is excessively high or low, it will lead to the delayed closure of the valve.  
Figure 18: (**a**) The movement of the suction valve at various limiter heights. (**b**) The mass flow characteristics of the suction valve at various limiter heights.  
**Author Contributions:** Conceptualization, [PERSON] and T.W.; methodology, [PERSON] and Y.W.; software, [PERSON] and J.S.; validation, [PERSON], [PERSON] and C.L.; formal analysis, [PERSON], J.S. and C.L.; data curation, C.L. and Z.H.; writing--original draft preparation, [PERSON] and Y.W.; writing--review and editing, [PERSON] and J.S.; funding acquisition, Y.W. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This work was supported in part by the Key R&D and Promotion Projects in Henan Province (202102310231), in part by the Postgraduate Education Reform and Quality Improvement Project of Henan Province (YJS2021 JD05), in part by the National Key R&D Program of China for International S and T Cooperation Projects (2017 YFE0103900), in part by the joint funds of the National Natural Science Foundation of China (U1804262), in part by the State Key Program of National Natural Science of China under grant 61632002, in part by the Foundation of Young Key Teachers from the University of Henan Province (2018 GJS092), in part by the Youth Talent Lifting Project of Henan Province (2018 HYTP016) and Henan Province University Science and Technology Innovation Talent Support Plan under grant 20 HASTIT027, and in part by the open fund of the State Key Laboratory of esophageal cancer prevention and treatment (K2020-0010, K2020-0011).  
**Institutional Review Board Statement:** This study did not involve humans or animals.  
**Informed Consent Statement:** This study did not involve humans or animals.  
**Data Availability Statement:** This study did not report any data.  
**Conflicts of Interest:** The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.  
**Nomenclature**  
\(t\)  Time  
\(\rho\)  Density  
\(v\)  Velocity vector  
\(f^{B}\)  Body force vector of the fluid medium  
\(\tau\)  Stress  
\(E\)  Specific total energy  
\(q\)  Heat flux  
\(q^{B}\)  Specific rate of heat generation  
\(M\)  Constant mass matrix  
\(C\)  Constant damping matrix  
\(K\)  Constant stiffness matrix  
\(R\)  External load vector  
\(F\)  Nodal point force vector equivalent to the element stresses  
\(\dot{U}\)  Vectors of nodal point velocities  
\(\ddot{U}\)  Vectors of nodal point accelerations  
\(\ddot{U}\)  Vector of nodal point displacement increments  
Subscripts  
\(f\)  The fluid  
\(d\)  Displacement