Pressure-Balanced Valve Sealing for Fast High-Cycle Operation
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Solution Overview
Problem
Pneumatically actuated valves in blow-molding processes require high axial sealing forces, which shorten the service life and reduce the number of operational cycles due to large control volumes and kinetic energies.
Innovation Solution
A valve unit with a dynamic process seal and a circumferential sealing edge of softer material, paired with a harder valve seat, minimizes axial sealing forces by using identical seal diameters and wedge-shaped configurations to optimize sealing and airflow, allowing for rapid operation with small pilot valves and increased service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high axial sealing forces are used to ensure sealing at high pressure, then sealing reliability is improved, but service life and number of operational cycles deteriorate
Solution Approach 1:
The patent changes the material parameters of the sealing components by using a softer, more elastic material for the valve seat and a harder material for the closing ring. This material parameter change allows the sealing interface to deform and conform under pressure, achieving reliable sealing without requiring excessively high axial sealing forces that would damage the valve components and reduce service life.
2Force
If large control volumes are used in pneumatically actuated valves, then sealing force is improved, but response time and operational speed deteriorate
Solution Approach 1:
The patent optimizes the control volume parameters by reducing the size of the control chambers while maintaining effective sealing force through the optimized material pairing and sealing geometry. The softer valve seat material compensates for the reduced control volume by providing better conformability and sealing contact, allowing rapid valve actuation without sacrificing sealing performance.
3Speed
If high kinetic energies are used for rapid valve operation, then response time is improved, but service life and number of cycles deteriorate
Solution Approach 1:
The patent employs a composite material system where the valve seat is made of a softer, more elastic material and the closing ring is made of a harder material. This composite material approach allows the valve to withstand high kinetic energies during rapid operation and cycling, as the softer valve seat absorbs impact and the harder closing ring maintains structural integrity, thereby extending service life while preserving rapid response capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The valve unit achieves a long service life with high surface pressure sealing at 40 bar, independent of process pressure, and enables rapid operation with reduced control chamber volumes, using small pilot valves and minimizing forces, thus increasing the number of cycles and service life.
Implementation Method 1
The use of identical seal diameters for the dynamic process seal and the circumferential sealing edge creates a balanced pressure distribution on the operating piston, minimizing axial sealing forces
Implementation Method 2
The circumferential sealing edge is made of softer and more elastic material than the valve seat, allowing it to deform and conform to the valve seat surface under high pressure conditions
Implementation Method 3
The closing ring is designed with a wedge-shaped configuration that optimizes the distribution of sealing forces and creates an efficient flow path for compressed air
Data Source
AI summary
A valve unit includes a valve housing having an input line and an output line or the process pressure as well as a process guide shaft, an operating piston for closing and opening a connection between the two lines, two control lines and two control chambers for controlling the operating piston. The operating piston has a closing ring which in the closed state of the connection sealingly abuts a valve seat of the valve housing and it has a diameter which corresponds to a guide diameter of a dynamic process seal. The valve seat includes a softer and more elastic material than the sealing edge. The valve unit has low axial forces, due to low sealing forces, thus makes a long service life with a high number of cycles of operation possible.