Gate Valve Sand Lock Sealing for Backside Cavity Protection
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Solution Overview
Problem
Conventional gate valves used in fracking operations suffer from sand buildup in the backside cavity, leading to valve sticking, abrasive damage, and leakage, posing safety and environmental risks, and existing solutions like pumping grease are incomplete and costly.
Innovation Solution
A pressure-actuated sealing mechanism within the gate valve, utilizing a piston with OD and ID seals, and a hydraulic ram assembly to prevent sand from entering the backside cavity, ensuring the valve can operate safely and efficiently in both open and closed positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional gate valves are used to deliver pressurized fluid sand mix, then fracking operations can be performed, but sand builds up in the backside cavity causing valve sticking and failure
Solution Approach 1:
The valve body is segmented into separate cavities using sand locks and sealing mechanisms. The backside cavity is isolated from the flow path through upstream and downstream sand locks that create sealed compartments, preventing sand from accumulating in the backside cavity while maintaining valve functionality.
Solution Approach 2:
A piston with OD and ID seals acts as an intermediary element between the flow path and the backside cavity. The piston responds to pressure differentials to open sealing mechanisms, allowing controlled access while preventing uncontrolled sand ingress into the backside cavity.
2Reliability
If grease is pumped into the backside cavity to prevent sand entry, then some protection is provided, but the solution is incomplete and costly
Solution Approach 1:
The valve system is self-protecting through pressure-actuated sand locks and sealing mechanisms that automatically respond to pressure differentials. The piston and seals create automatic sealing action without requiring external grease pumping systems, eliminating the need for complex external protection systems.
Solution Approach 2:
The harmful sand is extracted from the backside cavity through dedicated sand lock mechanisms and drainage pathways. The design actively removes sand particles from potential accumulation zones using pressure-driven ejection through sand lock ports, rather than relying on passive grease barriers.
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 effectively prevents sand from entering the backside cavity, reducing the risk of valve failure, maintaining operational integrity, and minimizing downtime and environmental impact, while allowing for safe and efficient fracking operations.
Implementation Method 1
a pressure actuated sealing mechanism incorporated within a gate valve
Implementation Method 2
piston with OD and ID seals
Implementation Method 3
hydraulic ram assembly
Data Source
AI summary
A singular piston included behind a valve seat within a gate valve assembly can be energized by external pressure through a hydraulic port within the valve body. When the back side of the singular piston is energized, the singular piston applies force in one direction against the adjacent valve seat, valve gate, opposing valve seat and valve seat pocket in both the valve open position and the valve closed position to block any unwanted matter from moving into the valve backside cavity. A singular piston has a pressure sealing surface and a piston pocket with an adjacent pressure sealing surface that allows the valve to seal in the closed position with the contained fluid bore pressure against the opposing valve body flow path side to the piston without the piston being energized.