Leaf-Spring Pressure Reducing Valve With Lower Load Amplitude

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The existing pressure reducing valves experience high load amplitude on the leaf spring due to the reciprocation of the valve body, leading to reduced durability of the biasing member.

Innovation Solution

The pressure reducing valve design includes a biasing member, such as a leaf spring, that is axially compressed and deformed before actuation, reducing fluctuations in load during reciprocation by causing an initial load to act on the biasing member.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the valve body reciprocates to adjust the opening degree of the valve passage, then the pressure reducing valve can control the secondary pressure, but high load amplitude acts on the leaf spring reducing its durability

Engineering Contradiction:

Improvedurability of biasing memberVSAvoidload amplitude on biasing member

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The biasing member is axially compressed and deformed before the valve body actuates, creating an initial load on the biasing member. This preliminary action reduces the fluctuation range of load during subsequent reciprocation, thereby reducing load amplitude and improving durability

Inventive Principle:

Principle #10Preliminary action

2Force

If the outer edge portion of the leaf spring is fixed by the casing, then the leaf spring can bias the valve body, but reciprocation causes high load amplitude on and around the outer edge portion

Engineering Contradiction:

Improvebiasing force on valve bodyVSAvoiddurability of leaf spring

Core Design Contradiction:

ForceVSReliability

Solution Approach 1:

The biasing member is pre-compressed axially before operation begins, establishing an initial load state. This preliminary compression ensures that during valve body reciprocation, the load fluctuation on the fixed outer edge portion is minimized, reducing stress concentration and improving durability

Inventive Principle:

Principle #10Preliminary action

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

This design improves the durability of the biasing member by minimizing load amplitude fluctuations, ensuring smooth operation and reducing component wear.

Implementation Method 1

The biasing member is a spring in the form of a plate extending radially outward from the valve body and is axially compressed and deformed at least when the secondary pressure is equal to atmospheric pressure

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentEP4607312A1Pressure reducing valve and valve device

Publication Date: 2025.08.27 KAWASAKI JUKOGYO KK

Figure 1
Figure 2
Figure 3

AI summary

This pressure reducing valve includes: a casing in which a valve passage is formed; a valve body that is housed in the casing in an axially movable manner and adjusts an opening degree of the valve passage according to secondary pressure; and a biasing member that is housed in the casing and biases the valve body in one axial direction against the secondary pressure. The biasing member is a spring in the form of a plate extending radially outward from the valve body and is axially compressed and deformed at least when the secondary pressure is equal to atmospheric pressure.