Duplex Filter Arrangement With Pressure Control Valve
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Solution Overview
Problem
Filter elements in hydraulic systems face damage and reduced lifespan due to sudden pressure changes during replacement, particularly in high-pressure applications, where the pressure drops or rises rapidly, causing stress on the elements and potential damage.
Innovation Solution
A duplex filter arrangement with a valve control member that connects filter chambers to a low-pressure reservoir, using expansion valves to gradually change pressure, preventing sudden pressure fluctuations and ensuring seals are not damaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter element replacement is performed in high-pressure hydraulic systems, then system maintenance is achieved, but sudden pressure changes cause damage to filter elements and seals
Solution Approach 1:
The system performs preliminary actions by automatically isolating the filter element from the high-pressure system before maintenance begins. The control system detects when a filter element needs replacement and proactively closes isolation valves to disconnect the filter element from the pressurized fluid stream, preventing pressure-related damage during the replacement process.
Solution Approach 2:
The patent introduces intermediary components including isolation valves and a controlled atmosphere chamber that act as mediators between the high-pressure hydraulic system and the filter element being replaced. These intermediaries create a safe transition zone where filter elements can be replaced without direct exposure to system pressure, thereby preventing pressure-induced damage.
2Ease of operation
If filter element replacement interrupts fluid flow, then filter maintenance is performed, but system productivity is reduced
Solution Approach 1:
The hydraulic system is segmented into multiple independent filter assemblies, each with its own isolation valves and controlled atmosphere chambers. This segmentation allows one filter element to be replaced while other segments continue to operate normally, maintaining overall system productivity while enabling necessary maintenance on individual filter elements.
Solution Approach 2:
The control system performs preliminary isolation of the specific filter element requiring maintenance before interrupting overall system operation. By pre-positioning isolation valves and preparing controlled atmosphere chambers, the system minimizes the duration and impact of flow interruption, allowing rapid filter element replacement with minimal productivity loss.
3Ease of operation
If pressure is reduced for safe filter element replacement, then operator safety is improved, but system pressure requirements are not met
Solution Approach 1:
The system is divided into pressurized operational segments and depressurized maintenance segments. Isolation valves create distinct pressure zones, allowing the maintenance segment (filter element chamber) to be depressurized for safe operator access while other segments remain pressurized to meet system operating requirements.
Solution Approach 2:
Isolation valves and controlled atmosphere chambers serve as intermediaries that decouple the pressure states of different system segments. These intermediaries enable the filter element replacement zone to operate at low or zero pressure for safety while maintaining high pressure in the rest of the hydraulic system to meet operational requirements.
Data Source
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AI summary
A filter arrangement having one or two filter chambers, wherein the arrangement comprises additional fluid lines that extend between each outlet of said filter chambers and a valve control member, wherein the valve control member is arranged to establish a connection between a reservoir and said additional fluid lines by control fluid inlet lines and control fluid outlet lines which can be interconnected with each other by the control.