Wedge Gate Valve Housing Reinforcement for Cryogenic Sealing
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Solution Overview
Problem
Wedge-shaped gate valves with minimal material thickness face challenges in maintaining strength and sealability, particularly under high-pressure conditions and ultra-low temperatures, leading to potential leakage due to deformation and uneven surface pressure.
Innovation Solution
A gate valve design featuring a reinforcing thickened part with a cylindrical, cone, or truncated cone shape, eccentric from the center line of the flow path, which reduces material thickness while enhancing stiffness and preventing deformation, ensuring uniform surface pressure and reliable sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the valve box is manufactured with minimum material thickness to reduce weight and cost, then the material usage and cost are reduced, but the strength and pressure resistance of the valve box deteriorate
Solution Approach 1:
The invention applies local quality by providing a thickened part only at the specific location where the coupling part and branching part meet, rather than uniformly thickening the entire valve box. This localized reinforcement maintains overall light weight while providing necessary strength at the critical stress concentration point
Solution Approach 2:
The thickened part is designed in advance during the valve box manufacturing process to prevent deformation before it occurs. By pre-reinforcing the structure at the coupling-branching boundary, the design proactively addresses potential strength issues without requiring additional corrective measures
2Quantity of substance
If the valve box is manufactured with minimum material thickness, then the material usage is reduced, but the sealability deteriorates due to deformation under high pressure
Solution Approach 1:
The thickened part is strategically positioned at the coupling part and branching part boundary, which is the critical area affecting sealability. This localized reinforcement prevents deformation at the sealing interface without requiring increased material thickness throughout the entire valve box
Solution Approach 2:
The thickened part acts as a preventive measure against deformation that would compromise sealing. By reinforcing the structure beforehand, the design counteracts the tendency toward deformation under high pressure before it can occur during operation
3Strength
If a uniform thickness rib is provided to reinforce the valve box, then the strength is improved, but the weight increases and castability deteriorates
Solution Approach 1:
Rather than providing a uniform thickness rib throughout, the invention uses a thickened part with gradually varying thickness that transitions smoothly from the base. This non-uniform design provides necessary reinforcement while maintaining good castability by avoiding abrupt thickness changes
Solution Approach 2:
The thickened part features a curved, gradually transitioning profile rather than sharp edges or uniform thickness. This curved design improves castability by facilitating smooth metal flow during casting while still providing the necessary structural reinforcement
Data Source
AI summary
A wedge-shaped gate valve with a branching part formed to be open in a direction orthogonal to an inner flow path of a valve box having a coupling part on both sides, and a valve disk ascends and descends from the branching part via a valve stem to open and close an annular valve seat surface. At a boundary between the coupling part and the branching part, a reinforcing thickened part having a cylindrical, cone, or truncated cone shape with a diameter gradually reducing from the branching part toward the coupling part side is provided, and the thickened part is formed by taking, as an outer shape, a cylinder, a cone, or a truncated cone with an axis P2 that is eccentric from a center line P1 of the flow path to the branching part side and is parallel to or crossing the center line P1 as a rotation axis.