Check Valve Stop With Powder Damping for Flapper Impact

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Solution Overview

Problem

Check valve stops often suffer damage due to high force contact during rapid opening, leading to potential failure.

Innovation Solution

Incorporating a stop with a lattice structure and particulate material within cavities to dissipate energy from the flapper's contact, utilizing additive manufacturing techniques to form the stop with metal components and selective deposition of particulate material for damping.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the valve plate opens rapidly to allow flow, then the flow rate increases, but the contact force between the valve plate and stop increases, leading to damage and failure

Engineering Contradiction:
Improveflow rateVSAvoidcontact force
Core Design Contradiction:
ProductivityVSForce

Solution Approach 1:

A powder damper consisting of granular material is introduced as an intermediary substance between the valve plate and the stop. When the valve plate contacts the stop, the powder damper absorbs and dissipates the impact energy through friction and deformation of the granular particles, reducing the peak contact force transmitted to the valve plate and stop while allowing rapid opening to maintain flow rate

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If the valve plate contacts the stop with high force during opening, then the valve opens reliably, but the valve plate or stop becomes damaged and fails

Engineering Contradiction:
Improvevalve opening reliabilityVSAvoidcomponent strength
Core Design Contradiction:
ReliabilityVSStrength

Solution Approach 1:

The powder damper is pre-installed in the cavity between the valve plate and stop before the valve operates. This beforehand cushioning mechanism is ready to absorb impact energy during each opening event, protecting the valve plate and stop from damage while ensuring reliable valve opening by maintaining sufficient contact force

Inventive Principle:
Principle #11Beforehand cushioning (Prior cushioning)

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 solution effectively dampens impact forces, reducing the risk of damage to the valve and stop, enhancing the durability and reliability of the check valve.

Implementation Method 1

at least partially filled with a particulate material movable within the at least one cavity to dampen an impact force generated when the flapper valve contacts the stop

Methodology Applied
Scientific EffectImpact damping: Damping

Data Source

PatentEP3742030B1Check valve stop with powder damper and method of making
Publication Date: 2022.03.30 HAMILTON SUNDSTRAND CORP
  • EP3742030B1 patent drawingFigure 1A~1B
  • EP3742030B1 patent drawingFigure 2A~2B
  • EP3742030B1 patent drawingFigure 3~4

AI summary

A check valve (17, 19) has a valve seat defining an aperture and a seating surface. A stop (59, 159)is fixed in position relative to the valve seat and has a solid portion formed as a single homogeneous component. At least one cavity is sealed within the solid portion and is at least partially filed with a particulate material. The solid portion defines a contact surface. A flapper (32) is moveable between a closed position in which the flapper is sealingly engaged with the sealing surface and an open position in which a contact surface of the flapper is in contact with the stop. A method is also disclosed.