Pipeline Pig Bypass Valve for Pressure-Based Speed Stabilization
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Solution Overview
Problem
Existing pipeline cleaning and inspection pigs face challenges in maintaining effective cleaning or data acquisition due to rapid speed changes, particularly in gas pipelines, leading to potential jamming and the need for repeated runs.
Innovation Solution
A bypass valve with a pressure-dependent piston that can move between open, closed, and maximum positions, allowing for pressure-controlled flow and adjustable energy storage means to regulate the pig's speed and prevent jamming, ensuring consistent flow and pipeline integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pig speed increases to improve productivity, then the cleaning effect and data acquisition quality decrease rapidly
Solution Approach 1:
The bypass valve employs a pressure-dependent piston that dynamically adjusts the bypass opening based on real-time pressure differential conditions. As the pig encounters obstacles and pressure builds up, the piston automatically opens the bypass to release pressure, preventing excessive speed increases. This dynamic control mechanism maintains consistent cleaning quality by limiting speed variations without requiring manual intervention or complex control systems.
2Reliability
If the pig encounters obstacles causing pressure buildup, then the pig may accelerate quickly but this leads to worsening cleaning quality and potential jamming
Solution Approach 1:
The bypass valve incorporates a pressure feedback mechanism where the piston position is directly controlled by the pressure differential between the front and rear of the pig. When pressure builds up due to obstacles, the increased differential pressure automatically actuates the piston to open the bypass, creating a feedback loop that prevents excessive pressure accumulation and speed surges. This self-regulating feedback system maintains cleaning quality while protecting pipeline integrity.
Solution Approach 2:
The bypass valve provides beforehand cushioning by preemptively releasing pressure buildup before it can cause dangerous acceleration or jamming. The pressure-dependent piston activates when pressure reaches critical levels, creating a safety mechanism that cushions against extreme pressure variations and speed fluctuations that would otherwise compromise cleaning quality or pipeline integrity.
3Manufacturing precision
If a bypass valve with pressure-dependent piston is added to control speed, then cleaning quality improves but device complexity increases
Solution Approach 1:
The bypass valve is designed as a self-service system where the pressure-dependent piston automatically regulates bypass opening based on pressure differential conditions without external control inputs. The system uses the process本身的压力信号 to control the valve opening, eliminating the need for external sensors, actuators, or control systems. This self-service approach achieves precise speed control while minimizing device complexity.
Solution Approach 2:
The bypass valve utilizes pneumatic principles where the pressure differential across the pig directly actuates the piston through gas pressure. This pneumatic actuation mechanism provides simple, reliable control without requiring electrical components, complex mechanical linkages, or external power sources. The pressure-driven piston movement efficiently translates pressure differential into valve opening control, achieving precise speed regulation with minimal structural complexity.
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 solution ensures the pig maintains a consistent speed range, reduces the risk of jamming, and prevents total pipeline shutdown by allowing for pressure-controlled flow adjustments, maintaining effective cleaning and inspection without the need for repeated runs.
Implementation Method 1
a pressure difference is built up due to the slowing of the propulsion caused by increased friction, which at a certain value presses the piston into the narrowest position of the valve
Implementation Method 2
Before the run, the force exerted by this on the piston can be changed by adjusting a force storage means
Data Source
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AI summary
The invention relates to a bypass valve for an inspection and/or cleaning pig, which are movable through a pipeline through which a medium flows, wherein the bypass valve (8) comprises an interior chamber having a flow profile, in which a piston (11) is arranged, which is movable, independently of pressure, in a longitudinal direction of the bypass valve via an energy storage means (12), and which is movable between a first, open position of the bypass valve, which allows a bypass for the medium, and a second position, which at least substantially closes the bypass, wherein the piston (11) can be transitioned further, starting from the first position via the second position, in the same direction, into a maximum position, which opens the bypass again, and a pig for inspecting and/or cleaning of pipelines.