Dynamic and static sealing performance of elastic check valve spool

Abstract

The non-metallic valve spool has the advantages of safety, stability, and biocompatibility. In order to expand the application of non-metallic elastic valve spool in medical water jet, a check valve spool structure with double-protrusion structure of polyurethane is designed to replace the metal valve spool and the spring thus achieves control of the fluid. Based on the non-linear mechanical response of elastic materials, ANSYS Workbench was used to calculate the stress and deformation under the different friction coefficient and pre-compression. The results show that the static sealing effect of the valve spool is best when the pre-compression is 0.1 mm and the friction coefficient between the spool and the valve sleeve is 0.2. Then, based on bidirectional fluid–solid coupling analysis through Fluent, the flow field changes during the interaction between fluid and elastic material and the key bearing position of the valve spool are clarified. The results shows that size, processing quality, and material properties of the inner ring protrusion will determine the dynamic sealing performance of elastic valve spool.

Keywords

• computational fluid dynamics
• seals (stoppers)
• deformation
• friction
• valves
• elasticity
• mechanical engineering computing
• stress analysis
• check valve spool structure
• metal valve spool
• nonlinear mechanical response
• elastic material
• pre-compression
• static sealing effect
• valve sleeve
• bidirectional fluid–solid coupling analysis
• dynamic sealing performance
• static sealing performance
• elastic check valve spool
• nonmetallic valve spool
• nonmetallic elastic valve spool
• medical water jet
• friction coefficient
• stress
• size 0.1 mm
• Fluent
• ANSYS Workbench
• deformation