Bellows Relief Valve for Pressure Equalization Without Air Ingestion
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Solution Overview
Problem
In reciprocating pumps with bellows seals, the backup seal prevents the bellows from breathing, leading to cycle fatigue and deformation, while adding a breather hole can cause air ingestion and pump failure upon bellows rupture.
Innovation Solution
A relief valve system with a spring-loaded check valve and buoyant material is integrated to manage pressure and fluid flow, allowing the bellows to expand and contract without air ingestion and maintaining pump operation even in case of rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a backup seal is employed to seal the shaft enclosed by the bellows, then fluid leaks are prevented, but the bellows cannot breathe during expansion and contraction causing cycle fatigue and deformation
Solution Approach 1:
A breather valve assembly is introduced as an intermediary component between the bellows interior and the external environment. This mediator allows controlled pressure equalization and gas exchange without compromising the fluid seal integrity provided by the backup seal, thereby eliminating the breathlessness issue that causes bellows fatigue while maintaining leak prevention.
2Duration of action of stationary object
If a simple breather hole with a screen or mesh is put between the bellows and backup seal, then the bellows can breathe, but air is ingested and the pump fails in case of bellows rupture
Solution Approach 1:
The breather valve assembly is segmented into distinct functional components: a check valve mechanism for unidirectional flow control, a buoyant material element for automatic valve operation, and a housing structure. This segmentation allows each component to perform its specific function - enabling breathing while preventing air ingestion and maintaining pump operation during bellows rupture.
Solution Approach 2:
The breather valve employs dynamic elements including a movable check valve element and buoyant material that respond automatically to pressure differential changes. During normal operation, the valve opens to allow breathing; during rupture conditions, the pressure change triggers automatic closure to prevent air ingestion, providing adaptive protection without complex control systems.
3Reliability
If the bellows are sealed completely to prevent leaks, then fluid exposure to air is prevented, but pressure buildup causes deformation and fatigue
Solution Approach 1:
The breather valve assembly serves as a pressure-regulating intermediary that allows controlled pressure equalization between the bellows interior and exterior. This mediator prevents dangerous pressure buildup that would cause deformation and fatigue while maintaining effective fluid containment through the backup seal, achieving both leak prevention and pressure management.
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 relief valve system prevents air ingestion and fluid loss, maintaining pump functionality and extending bellows lifespan by managing pressure and allowing safe expansion and contraction of the bellows.
Implementation Method 1
The first valve element is disposed in the first chamber and includes a spring-loaded check valve element
Implementation Method 2
The second valve element is disposed in the second chamber and includes a buoyant material
Data Source
AI summary
A valve for a reciprocating pump includes a housing, a first chamber, a second chamber, a first valve element, and a second valve element. The housing includes an inlet and an outlet. The first and second chambers are within the housing. The first chamber includes a first valve seat and is fluidly connected to the inlet. The second chamber includes a second valve seat and is fluidly connected to the outlet. The first valve element is disposed in the first chamber and includes a spring-loaded check valve element. The second valve element is disposed in the second chamber and includes a buoyant material.