Pilot-Sleeve Main Stop Valve for Controlled Hydraulic Opening
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Solution Overview
Problem
Existing main stop valves, such as hydraulic-actuation type T&T valves, face complexity in structure due to the need for bypass flow paths and pilot relay valves, which can lead to unintended valve opening when hydraulic oil is supplied before the piston is reset.
Innovation Solution
A simplified main stop valve design incorporating a pilot mechanism with a hydraulic cylinder, piston, valve rod, pilot cylinder, sliding ring, and pilot sleeve, where the pilot sleeve is displaced by a handle to control the valve rod and valve body, allowing for adjustable opening and reducing structural complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bypass flow path and spring support sleeve are added to prevent unintended valve opening, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The invention extracts the pilot control function from the main valve body, placing it in a separate pilot cylinder. This removes the complex bypass flow path and spring support sleeve from the main structure, preventing unintended valve opening through a dedicated pilot mechanism that controls hydraulic oil supply independently.
Solution Approach 2:
The pilot cylinder acts as an intermediary device that mediates between the operator's manual input and the main valve's hydraulic system. By using a sliding ring and communication port mechanism, it precisely controls when hydraulic oil is supplied to the piston, preventing unintended activation while maintaining simple main valve structure.
2Reliability
If a pilot relay valve is added to selectively supply hydraulic oil, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The invention segments the hydraulic control system into a pilot cylinder portion and a main valve body portion. The pilot cylinder contains simplified components (sliding ring, communication port, spring) that separately control hydraulic oil supply timing, achieving selective supply functionality without the complexity of a traditional pilot relay valve embedded in the main body.
Solution Approach 2:
The pilot cylinder creates a simplified copy of the valve control function, using a sliding ring that mimics the piston's movement to control hydraulic oil supply. This copied mechanism achieves the same selective supply purpose with fewer and simpler components than a full pilot relay valve.
3Ease of operation
If the valve rod is rotated manually before hydraulic oil supply, then the operational control is improved, but the ease of operation deteriorates due to additional steps
Solution Approach 1:
The sliding ring is pre-positioned at the bottom of the pilot cylinder before operation begins. This preliminary positioning ensures that hydraulic oil cannot supply to the piston until the sliding ring is manually moved upward by rotating the valve rod, preventing unintended valve opening while maintaining the simple manual rotation operation.
Solution Approach 2:
The sliding ring automatically performs the function of controlling hydraulic oil supply timing through its own movement in response to valve rod rotation. The spring automatically pushes the sliding ring to the bottom position when hydraulic oil pressure decreases, eliminating the need for separate reset operations or complex control mechanisms.
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 simplified pilot mechanism allows for stable and controlled operation of the valve rod with reduced operational force, preventing unintended valve opening and maintaining hydraulic pressure balance, thus enhancing the structural simplicity and operational reliability of the main stop valve.
Implementation Method 1
hydraulic pressure is applied to the piston in the hydraulic cylinder so as to lift the valve rod and the valve body
Implementation Method 2
the piston to which the hydraulic pressure is not applied is pushed down by the pressing force of the spring, thereby closing the valve quickly
Data Source
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AI summary
A main stop valve includes: a hydraulic cylinder; a piston arranged in a hydraulic cylinder; a valve rod connected to the piston; and a valve body connected to the valve rod and configured to block a steam passage. The main stop valve further includes: a pilot cylinder having a communication port in fluid communication with the hydraulic cylinder; a rod connected in parallel with the valve rod and configured to be inserted from one end of the pilot cylinder; a sliding ring provided on the rod; and a pilot sleeve configured to be slidably fitted into an inner surface of the pilot cylinder and slidably fitted into an outer peripheral surface of the sliding ring in a section between the one end of the pilot cylinder and the communication port.--