Wedge Guide for Gate Valve Seat Retainer Locking
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Solution Overview
Problem
Existing gate valve designs experience extrusion of face seals and leakage between seat retainer and pocket faces under extreme temperature and pressure conditions, leading to downtime, despite previous attempts to address these issues without consistent results.
Innovation Solution
The implementation of wedge guides with tapered surfaces that engage corresponding areas on seat retainers, creating a positive lock by pushing the seat retainers into their pockets, ensuring no gap between the seat pocket and retainer faces under all operating conditions, and allowing easy removal for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seat retainers are allowed to move freely in seat pockets, then easy removal for maintenance is achieved, but seal extrusion and leakage occur under extreme pressure and temperature conditions
Solution Approach 1:
The wedge guide is pre-installed in the valve body with tapered surfaces positioned to engage the seat retainers before pressure buildup occurs. When pressure increases, the wedge guide automatically pushes the seat retainers into their pockets, creating a positive lock that prevents seal extrusion and leakage under extreme conditions.
Solution Approach 2:
The wedge guide utilizes pressure-induced parameter changes by allowing theBonnet to move axially under high pressure, which forces the wedge guide to engage the seat retainers more firmly into their pockets, dynamically adapting the locking force to match operating conditions.
2Reliability
If wedge guides are permanently fixed in place, then positive lock under pressure is achieved, but removal for maintenance becomes difficult
Solution Approach 1:
The wedge guide incorporates a preliminary release mechanism where the Bonnet is designed to move axially under high pressure, automatically disengaging the wedge guide from the seat retainers when pressure is reduced, allowing easy removal for maintenance without permanent fixation.
3Reliability
If seat retainers are constrained tightly in pockets, then leakage is prevented, but seal extrusion occurs under extreme temperature and pressure
Solution Approach 1:
The wedge guide system dynamically adjusts the constraint force on seat retainers based on operating parameters. Under normal conditions, the retainers are loosely positioned for easy removal. When pressure and temperature increase, the wedge guide automatically pushes the retainers into their pockets, increasing constraint force to prevent both leakage and seal extrusion.
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
This solution provides a bubble-tight seal at pressures up to 20,000 PSI and temperatures as low as -50°F, preventing seal damage and ensuring reliable operation across varying conditions while allowing for easy maintenance.
Implementation Method 1
A wedge guide is provided that goes between two seat retainers of the seat assembly... The wedge guide comprises a tapered surface that engages a corresponding tapered area on the seat retainer face
Data Source
AI summary
A wedge guide has two wedge surfaces. The first angled surface engages a first seat retainer positioned on one side of a gate to lock the first seat retainer in a first pocket. The wedge guide has a second angled surface that engages a second seat retainer on the other side of the gate that locks the second seat retainer in a second pocket. The wedge guide does not affect the movement of the seats that move axially between the gate and the respective seat retainers. Two wedge guides are preferably utilized on opposite non-sealing sides of the gate so that the gate slides between them.