Pressure Equalizing Gate Valve for High-Pressure Wellheads
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Solution Overview
Problem
Conventional valve designs fail to effectively equalize fluid pressure across valves in high-pressure environments, such as subterranean wellhead assemblies, leading to inefficiencies and potential leakage when changing valve positions.
Innovation Solution
A pressure equalizing valve assembly with a gate valve design that includes a flow control assembly with a cage and closure member, allowing for controlled fluid flow and pressure equalization between the upstream and downstream sides, using a tangential fluid entry to distribute pressure evenly and prevent premature wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valve designs are used in high-pressure environments, then the valve structure is simple, but the valve cannot effectively equalize fluid pressure across the valve, leading to potential leakage and operational failure
Solution Approach 1:
The valve assembly is divided into separate functional components: a pressure equalization system with equalization ports and chambers, and a flow control system with a gate valve. This segmentation allows independent optimization of pressure equalization capability while maintaining manageable structural complexity.
Solution Approach 2:
Equalization ports and intermediate chambers are introduced as intermediary elements between the upstream and downstream sides of the valve. These intermediaries facilitate controlled pressure equalization by allowing fluid to pass through defined pathways, enabling reliable pressure balancing without direct exposure to full pressure differential.
2Stress or pressure
If the valve is designed for high-pressure operation, then the valve can handle high pressures, but the valve requires complex pressure equalization mechanisms to change positions safely
Solution Approach 1:
The pressure equalization system performs preliminary action by equalizing pressures across the gate valve before the gate is moved from closed to open position. Equalization ports allow pressure to be balanced in advance, enabling safe gate movement without exposing the gate to unbalanced high-pressure forces that would complicate the design.
Solution Approach 2:
The valve system dynamically transitions between different operational states: pressure equalization mode (with equalization ports open) and flow control mode (with gate positioned). This dynamic operation allows the valve to adapt to different pressure conditions, handling high pressures when closed while enabling easy position changes through controlled pressure balancing.
3Reliability
If the valve operates between fully open and fully closed positions, then the valve provides reliable shut-off, but the valve cannot control fluid flow at intermediate positions under high pressure
Solution Approach 1:
The valve assembly combines multiple functions into a single system: the gate valve provides reliable shut-off capability when closed, while the equalization ports and flow control mechanism enable intermediate flow control positions. This multi-functionality allows the same valve assembly to operate reliably in both extreme positions and provide modulated flow control at intermediate positions under high-pressure conditions.
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
Enables reliable shut-off of fluid flow without leakage, even at high pressures up to 3,000 psi, by ensuring equal pressure across the valve, thus maintaining operational integrity and efficiency in harsh environments like subsea wellhead installations.
Implementation Method 1
fluid pressure across the valve is required to be equalized
Implementation Method 2
using a tangential fluid entry to distribute pressure evenly and prevent premature wear
Data Source
AI summary
A gate valve assembly, the assembly includes a gate valve having a gate assembly moveable between a closed position and an open position. The gate assembly includes a pressure equalizing assembly coupled to the gate valve that equalizes the fluid pressure across the gate valve.