Ship Steering Valve Layout for Pressure Relief Without Relief Valves
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Solution Overview
Problem
Existing steering devices for ships require relief valves to manage pressure, which restricts the design freedom of oil passages and can lead to vacuum generation and inability to lock the cylinder during shock loads.
Innovation Solution
A steering device with a cylinder divided into two chambers and a main valve system that includes shuttle chambers and check valves, allowing oil to be redirected between chambers to manage pressure without a relief valve, enabling improved oil passage design and preventing vacuum formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relief valve is used to manage pressure in the oil passage, then pressure control is improved, but the degree of freedom of oil passage design is reduced
Solution Approach 1:
The invention extracts the pressure relief function from a separate relief valve component and integrates it into the main valve body through the idle chamber mechanism. The idle chamber, which is already part of the main valve structure, is utilized to receive and manage excess oil, thereby eliminating the need for a separate relief valve and its associated oil passage connections.
Solution Approach 2:
The idle chamber in the main valve is given multiple functions: it serves as both a structural component of the valve body and as a pressure relief receptacle. This multi-functionality allows the same component to handle both valve operation and pressure management, reducing the overall system complexity and increasing design freedom.
2Reliability
If a relief valve is used to relieve operating oil to an oil storage tank, then excessive pressure increase is suppressed, but additional oil passages and components are required
Solution Approach 1:
The invention merges the pressure relief function with the existing main valve structure. The idle chamber is integrated into the main valve body, and the oil passage connections are combined with the existing valve port structure. This merging eliminates the need for separate relief valve components and their associated piping to the oil storage tank.
Solution Approach 2:
The main valve structure serves itself by using its own idle chamber to handle pressure relief. The idle chamber is already part of the valve assembly, so it can directly receive and manage excess oil without requiring external relief valve components or additional connections to the oil storage tank.
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 solution allows for enhanced oil passage design flexibility and effective pressure management, preventing vacuum formation and enabling the cylinder to remain locked during shock loads, improving the overall performance of the steering device.
Implementation Method 1
the spool is pushed by a high pressure-side piston arranged on an oil passage on a relatively high pressure-side, which is one of the first piston and the second piston, thereby closing the oil passage on the high pressure-side, and pushes a low pressure-side piston arranged on an oil passage on a relatively low pressure-side
Data Source
AI summary
A steering device includes: a cylinder demarcated into first and second chambers by a piston; a main valve having first and second shuttle chambers; a hydraulic source having first and second discharge ports; a first oil passage configured to connect the first chamber and the first shuttle chamber; a second oil passage configured to connect the second chamber and the second shuttle chamber; a third oil passage configured to connect the first shuttle chamber and the first discharge port; a fourth oil passage configured to connect the second shuttle chamber and the second discharge port; and a tank connected to the main valve via the third oil passage and the fourth oil passage. One of the first shuttle chamber and the second shuttle chamber of the main valve is in an opened state when the hydraulic source is stopped.