Remote Seal Valve Isolation for Dirty Fluid Pressure Control
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Solution Overview
Problem
Conventional valves in hydrocarbon production and transfer systems often malfunction due to unprocessed or dirty fluids, leading to clogging and reduced performance, as they rely directly on the pressure of impure fluids for operation.
Innovation Solution
A self-regulating valve system incorporating a seal isolator that transmits the pressure of the process fluid to a working fluid at a one-to-one ratio, using a diaphragm to control the valve actuator and positioner, allowing the valve to open or close based on fluid pressure without external control signals, thereby reducing clogging and extending operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valves directly use process fluid pressure for operation, then the valve structure is simple, but the valve malfunctions due to clogging from unprocessed or dirty fluids
Solution Approach 1:
The valve system is divided into separate functional components: a seal isolator that interfaces with the dirty process fluid, a working fluid chamber that remains clean, and the valve actuation mechanism. This segmentation isolates the valve mechanism from direct exposure to contaminants while maintaining functional connectivity through the seal isolator and working fluid.
Solution Approach 2:
A seal isolator acts as an intermediary component between the dirty process fluid and the clean working fluid. The seal isolator transmits pressure from the process fluid to the working fluid while preventing direct contact between the fluids, thereby protecting the valve mechanism from clogging while maintaining operational reliability.
2Duration of action of stationary object
If the valve is isolated from direct fluid contact to prevent clogging, then the valve operational life is extended, but the device complexity increases due to additional isolation components
Solution Approach 1:
A diaphragm serves as a flexible barrier that physically isolates the process fluid from the working fluid while allowing pressure transmission. This thin film approach provides effective isolation without requiring complex mechanical seals or multiple discrete components, thereby extending valve operational life with minimal added complexity.
Solution Approach 2:
The system uses hydraulic pressure transmission through an incompressible working fluid to transfer force from the seal isolator to the valve actuator. This pneumatic/hydraulic mechanism provides reliable force transmission while maintaining fluid isolation, extending valve life without significant complexity increase.
3Object-generated harmful factors
If a seal isolator is introduced to transmit pressure without direct fluid contact, then clogging is reduced, but the device complexity increases
Solution Approach 1:
The seal isolator functions as a mediator that allows pressure communication between the process fluid and working fluid while preventing direct contact. This single intermediary component effectively eliminates clogging of the valve mechanism without requiring complex filtration or multiple isolation devices.
Solution Approach 2:
The harmful contaminants are extracted from the pressure transmission path by introducing a clean working fluid that does not contact the process fluid. The seal isolator extracts only the pressure signal while leaving the contaminants behind in the process fluid chamber, preventing clogging with minimal added 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 system provides stable regulation of process flow, reduces downtime, and extends the operational life of valves by isolating the dirty fluid from the valve mechanism, allowing operation with minimal communication to a control system and reducing clogging issues.
Implementation Method 1
The isolator diaphragm is configured to transmit a pressure of the flow of the process fluid to the pressure of the working fluid
Implementation Method 2
a plug coupled to the valve diaphragm and operable to move toward an open position to allow the flow of the process fluid through the valve body or toward a closed position to disallow the flow of the process fluid through the valve body based on movement of the valve diaphragm relative to a pressure of the working fluid
Data Source
AI summary
A valve includes a valve body with an inlet and an outlet coupled to a tubular conduit operable to circulate a flow of a process fluid, an actuator with an interior volume divided by a valve diaphragm into a first volume portion that encloses a working fluid and a second volume portion, and a plug coupled to the valve diaphragm and operable to move toward an open position or a closed position based on movement of the valve diaphragm relative to a pressure of the working fluid. A seal isolator is coupled to the tubular conduit and includes an isolator diaphragm having a first side exposed to the flow of the fluid and a second side fluidly coupled to the first volume portion through the working fluid. The isolator diaphragm is configured to transmit a pressure of the flow of the process fluid to the pressure of the working fluid.