Pressure Control Valve With Internal Check Valve and Spring Biasing
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Solution Overview
Problem
Existing pressure control valves using Belleville spring stacks face challenges in precise pressure control due to assembly complexity and maintenance requirements, necessitating frequent cleaning and reassembly.
Innovation Solution
A pressure control valve design that replaces Belleville springs with a compression spring and check valve, utilizing fluid pressure and a self-controlling mechanism with a vent hole for simplified assembly and maintenance, and incorporating a check valve to regulate fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a stack of Belleville springs is used to bias the poppet, then high forces for small deflection are achieved with long surface life, but assembly complexity increases and maintenance requires frequent cleaning and reassembly
Solution Approach 1:
The patent extracts the problematic Belleville spring stack from the system and replaces it with a single compression spring. This removes the source of assembly complexity and maintenance issues while retaining the essential biasing function needed for poppet operation.
Solution Approach 2:
The invention segments the spring function into two distinct components: a simple compression spring for biasing and a check valve for flow control. This segmentation allows each component to be optimized independently, with the compression spring providing reliable long-term operation without the assembly issues of Belleville stacks.
2Adaptability or versatility
If a stack of Belleville springs is used to bias the poppet, then the force can be adjusted by varying the number of springs, but maintenance time increases due to cleaning and reassembly requirements
Solution Approach 1:
The patent removes the adjustable Belleville spring stack and replaces it with a fixed compression spring design. This eliminates the need for disassembly, cleaning, and reassembly during maintenance, dramatically reducing maintenance time while the force adjustment capability is maintained through other means such as spring selection or pre-load adjustment mechanisms.
Solution Approach 2:
The invention adopts a simpler compression spring that can be easily replaced if needed, rather than using a complex Belleville stack that requires careful reassembly. This approach treats the spring as a maintenance-friendly component that can be quickly swapped without affecting other valve components.
3Ease of operation
If a compression spring and check valve design is used, then assembly and maintenance are simplified, but the ability to produce high forces for small deflection may be reduced
Solution Approach 1:
The patent introduces a check valve as an intermediary component that works in conjunction with the compression spring. The check valve controls fluid flow to the poppet, providing additional force multiplication and control capability that compensates for the lower force output of the simple compression spring, thereby maintaining overall system performance.
Solution Approach 2:
The invention utilizes hydraulic principles by introducing fluid pressure control through the check valve mechanism. This allows the system to leverage fluid pressure to generate the necessary high forces on the poppet, compensating for the reduced mechanical advantage of the simple compression spring compared to a Belleville stack.
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 new design achieves accurate pressure regulation with reduced size, weight, and part count, enabling simplified assembly and maintenance procedures while maintaining precise control.
Implementation Method 1
a compression spring (44) located between the piston (42) and an end (45) of the housing (41) to axially bias the piston (42) relative to the valve seat (43)
Implementation Method 2
The check valve (50) is provided inside the piston (42)
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A pressure control valve comprising: a valve housing (41) extending along an axis (A); a valve seat (43); a valve piston (42) mounted within the valve housing arranged to move axially within the valve housing relative to the valve seat; and a compression spring (44) located between the valve piston and an end of the valve housing to axially bias the valve piston relative to the valve seat; and a check valve (50) located within the valve piston.