Gate Valve Sealing Groove Protrusions for High-Pressure Tightness
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Solution Overview
Problem
Gate valves face challenges in maintaining fluid tightness, especially at higher fluid pressures, due to the high force required to move the gate plate between open and closed positions, which can lead to deformation and increased friction, potentially dislodging the sealing members.
Innovation Solution
The design incorporates protrusions made of a rigid material extending from the sealing groove surfaces, which guide the gate plate and reduce the force needed to open and close the valve by preventing deformation and maintaining the sealing members in place, thereby reducing friction and preventing the sealing members from being pushed out of the groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gate valve is designed for larger diameter applications with high fluid pressures, then the flow capacity is improved, but the force required to move the gate plate increases significantly
Solution Approach 1:
The sealing groove is divided into multiple segments by introducing protrusions that create separate sealing zones. This segmentation allows the gate plate to be supported at multiple points along its length, distributing the high fluid pressure forces across several locations rather than concentrating them in a single sealing interface, thereby reducing the total force required to move the gate plate while maintaining effective sealing for large diameter applications
Solution Approach 2:
The protrusions extend into the sealing groove from the valve body, creating a three-dimensional sealing structure. This dimensional addition provides lateral support to the gate plate, preventing deformation under high pressure and reducing friction against the sealing surfaces, thus lowering the operational force requirement while maintaining sealing effectiveness
2Reliability
If higher fluid pressures are used to maintain sealing force, then fluid tightness is improved, but the friction and deformation of the gate plate increase
Solution Approach 1:
The protrusions create localized support zones within the sealing groove at specific positions where the gate plate contacts the valve body. This local reinforcement provides structural support exactly where needed to prevent gate plate deformation under high pressure, while the spaces between protrusions allow controlled movement and reduce overall friction, maintaining fluid tightness without the harmful effects of excessive friction and deformation
Solution Approach 2:
The protrusions act as intermediary elements between the valve body and the gate plate. These rigid protrusions transfer and distribute the high fluid pressure forces through the gate plate at multiple points, preventing direct concentration of forces that would cause deformation and excessive friction, thereby maintaining sealing reliability while reducing harmful mechanical effects
3Reliability
If the sealing members are made softer to improve sealing, then fluid tightness is improved, but the sealing members are more easily dislodged by high fluid pressures
Solution Approach 1:
The sealing groove is segmented by protrusions into multiple confined sealing zones. This segmentation physically restrains the softer sealing members within defined spaces, preventing them from being dislodged by high fluid pressures while still allowing them to deform sufficiently to maintain fluid tightness against the gate plate. The protrusions act as mechanical barriers that contain the sealing members in their proper positions
4Strength
If the gate plate is made thicker to reduce deformation, then structural strength is improved, but the force required to move the gate plate increases
Solution Approach 1:
The protrusions segment the sealing groove into multiple zones that provide distributed support to the gate plate. This segmentation allows the gate plate to be thinner overall while still maintaining sufficient structural strength, as the protrusions provide localized reinforcement at critical sealing points, reducing the need for excessive gate plate thickness and the associated increase in moving mass and required operational force
Data Source
Figure 1
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Figure 3~4
AI summary
A gate valve (1) comprising a plate-shaped valve housing (2) circumscribing a flow opening (3) , two pipes (11, 12), and a gate plate (4), wherein the valve housing comprises a circumferential sealing groove (5), wherein a protrusion (7) positioned closer to the flow opening than sealing members (6) extends from one of two opposed surfaces (51) of the sealing groove towards the other of the two opposed surfaces of the sealing groove, and wherein the protrusion is of a material more rigid than a sealing material of the sealing members, or, alternatively, when no fluid pressure acts on one of the major surfaces of the gate plate, the protrusion does substantially not deform if the gate plate abuts the protrusion.