Pressure-Reducing Valve Segmented Piston Hysteresis Control
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Solution Overview
Problem
Existing pressure-reducing valves face issues with non-uniform contact surface pressure due to low precision in coaxial alignment of retaining portions, leading to increased friction and hysteresis, making them difficult to control and costly to manufacture in large quantities.
Innovation Solution
A pressure-reducing valve design featuring a pressure-reducing piston and a driving piston, where the driving piston receives secondary pressure to displace the pressure-reducing piston and control the primary port opening, allowing for separate manufacturing and reduced coaxial tolerance requirements, along with a rod and base rod configuration that supports the rod with a partial spherical support surface to prevent uneven contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If retaining portions are disposed coaxially with low precision, then manufacturing cost is reduced, but non-uniform contact surface pressure is applied to the piston causing hysteresis
Solution Approach 1:
The piston is divided into two separate components: a pressure-reducing piston and a driving piston. This segmentation allows each piston to be retained independently by separate retaining portions, so that low coaxial precision in one retaining portion does not affect the other. The pressure-reducing piston controls the opening degree while the driving piston responds to secondary pressure, enabling functional separation that tolerates manufacturing variations.
Solution Approach 2:
The invention introduces a new dimensional aspect by adding the driving piston with a secondary-pressure receiving surface that operates in response to secondary pressure. This creates an additional control dimension where the driving piston's displacement is driven by secondary pressure rather than directly by primary pressure, allowing the system to compensate for misalignment through pressure-driven adjustment.
2Manufacturing precision
If processing precision of the housing is improved to decrease coaxial tolerance, then hysteresis is reduced, but manufacturing cost increases
Solution Approach 1:
By segmenting the piston into pressure-reducing and driving portions with separate retaining mechanisms, the system no longer requires a single高精度 coaxial alignment. Each retaining portion can be manufactured with standard tolerances, and the functional separation ensures that minor misalignments do not propagate to affect overall performance.
Solution Approach 2:
The invention changes the operational parameters by introducing secondary pressure as a driving force for the driving piston. This parameter change allows the system to operate effectively with larger coaxial tolerances, as the secondary pressure-driven displacement compensates for alignment variations that would otherwise cause hysteresis.
3Device complexity
If a single piston is used to control opening degree, then device complexity is reduced, but control precision is worsened due to friction from non-uniform contact
Solution Approach 1:
The single piston is segmented into a pressure-reducing piston that directly controls the opening degree and a driving piston that responds to secondary pressure. This segmentation allows the pressure-reducing piston to be lighter and more responsive, while the driving piston provides pressure-driven control that compensates for friction effects, improving overall control precision without significantly increasing complexity.
Solution Approach 2:
The driving piston acts as an intermediary between the secondary pressure and the pressure-reducing piston. It translates secondary pressure into controlled displacement that adjusts the opening degree, providing a mediation mechanism that reduces the direct impact of friction and non-uniform contact on control precision.
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
This design reduces hysteresis and manufacturing costs by allowing for easier control and increased production quantities, while ensuring reliable sealing and preventing leakage under high-pressure conditions.
Implementation Method 1
a spring mechanism configured to exert a spring force against the secondary pressure to displace at least one of the pressure-reducing piston and the driving piston
Implementation Method 2
a driving piston displaceably retained in the interior of the housing, the driving piston being displaced to cause the pressure-reducing piston to be displaced in association therewith and having a secondary-pressure receiving surface that receives a secondary pressure, from a fluid in the secondary-pressure space
Data Source
AI summary
A pressure-reducing valve includes a housing, a pressure-reducing piston, a driving piston, and a spring mechanism. The housing is provided with a primary port and a secondary port. The pressure-reducing piston is displaceably retained in an interior of the housing. The pressure-reducing piston is displaced to control an opening degree of the primary port and configured to separate the interior of the housing into a primary-pressure space connected to the primary port and a secondary-pressure space connected to the secondary port. The driving piston is displaceably retained in the interior of the housing. The driving piston is displaced to cause the pressure-reducing piston to be displaced in association therewith and has a secondary-pressure receiving surface that receives a secondary pressure from a fluid in the secondary-pressure space. The spring mechanism is configured to exert a spring force against the secondary pressure to at least one of the pistons.