Extended Gate Valve Seats for Leak-Free High-Pressure Sealing

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Solution Overview

Problem

Existing gate valves struggle with fluid leakage and wear due to the lack of effective sealing mechanisms, particularly when handling abrasive and corrosive fluids under high pressure, necessitating frequent maintenance and grease injections.

Innovation Solution

A gate valve design featuring interchangeable first and second seats with flat sides and body bushings that align with circumferential seat pockets, allowing for a sliding gate movement between open and closed positions, ensuring seamless fluid isolation without requiring periodic grease injections, and utilizing seal rings and elastomeric cords for enhanced sealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional gate valve sealing mechanisms are used, then the valve can handle high pressure fluids, but fluid leakage occurs and wear increases due to lack of effective sealing

Engineering Contradiction:

Improvesealing integrityVSAvoidfluid leakage and wear

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The gate valve sealing system is segmented into multiple independent sealing surfaces: upstream seat sealing surface, downstream seat sealing surface, gate-to-seat sealing surfaces, and body bushing sealing surfaces. Each sealing surface operates independently to prevent fluid leakage, allowing the system to maintain reliability under high pressure without generating harmful leakage or wear.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Body bushings are introduced as intermediary components between the valve body and seats. These bushings provide precise alignment of sealing surfaces and reduce direct wear between the gate and valve body, thereby improving sealing integrity while reducing wear and fluid leakage.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If abrasive and corrosive fluids are handled under high pressure, then the valve must withstand harsh conditions, but sealing integrity deteriorates and maintenance frequency increases

Engineering Contradiction:

Improveability to handle abrasive and corrosive fluidsVSAvoidsealing integrity under pressure

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

Different sealing surfaces are designed with locally optimized properties: upstream and downstream seats have sealing surfaces oriented perpendicular to fluid flow for robust sealing, while body bushings provide corrosion-resistant intermediate surfaces. This local differentiation allows the valve to handle abrasive and corrosive fluids while maintaining sealing integrity under high pressure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The sealing system utilizes composite construction with multiple materials optimized for different functions: wear-resistant materials for gate sealing surfaces, corrosion-resistant materials for body bushings, and pressure-resistant designs for seat structures. This composite approach enables the valve to withstand harsh fluid conditions while maintaining reliable sealing.

Inventive Principle:

Principle #40Composite materials

3Reliability

If periodic grease injections are used to maintain sealing, then short-term sealing is improved, but maintenance complexity and operational interruptions increase

Engineering Contradiction:

Improvesealing performanceVSAvoidmaintenance requirements

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The sealing surfaces are designed to maintain their own integrity through proper geometry and material selection. The flat sealing surfaces on upstream and downstream seats, combined with precisely aligned body bushings, create self-sustaining sealing contact that does not require periodic grease injection, eliminating maintenance interruptions while maintaining reliable sealing performance.

Inventive Principle:

Principle #25Self-service

4Ease of manufacture

If the gate valve uses simple seat structure, then manufacturing is easier, but alignment precision and sealing effectiveness decrease

Engineering Contradiction:

Improveseat structure fabricationVSAvoidseat opening alignment with fluid passageway

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

Body bushings serve as intermediary alignment components that precisely position the seats relative to the valve body and fluid passageway. This intermediary structure simplifies manufacturing by allowing separate fabrication of bushings and seats, while ensuring precise alignment through the bushing's fitted connection to both components, thereby maintaining sealing effectiveness without complicating the overall manufacturing process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12404938B2Extended seat for a gate valve

Publication Date: 2025.09.02 SEVERE SERVICE VALVE INC

AI summary

A gate valve for controlling the flow of fluid media through a fluid passageway includes a gate positioned between two seats within a valve chamber. The gate includes a gate opening and a sealing surface. The first and second seats each include a seat opening and a sealing surface. The gate may be in an open position where the gate opening is aligned with the seat openings or a closed position where the sealing surface of the gate is aligned with the seat openings to close off the fluid passageway and the gate opening is aligned with the sealing surfaces of the seats to close off both sides of the gate opening. The seats are configured to prevent any of the fluid media from leaking into the valve chamber when the gate is moved between the open and closed positions.