Valve Drive Shaft Limiting Device for Diaphragm Protection

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Solution Overview

Problem

In driving apparatuses and valves, the existing design makes it difficult to install and maintain the valve core assembly as the nut can be excessively screwed, potentially damaging the diaphragm during maintenance, requiring the clamping surface to be clamped without removing the spring cartridge.

Innovation Solution

A driving apparatus with a limiting device featuring a groove and a protruding member that limits the rotation of the drive shaft, preventing excessive rotation and protecting the sensing device, allowing for easier maintenance and installation without removing the spring cartridge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of repair

If the nut is screwed during maintenance without clamping the clamping surface, then the valve core assembly can be installed or removed, but the drive shaft rotates excessively and damages the diaphragm

Engineering Contradiction:

Improveease of valve core assembly installationVSAvoidintegrity of diaphragm

Core Design Contradiction:

Ease of repairVSReliability

Solution Approach 1:

The limiting device with groove and protruding member is pre-installed on the drive shaft before maintenance operations. This preliminary structural arrangement automatically prevents excessive rotation when the nut is screwed, eliminating the need for additional clamping actions while protecting the diaphragm from damage.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the clamping surface is clamped to prevent drive shaft rotation, then the diaphragm is protected from damage, but the spring cartridge must be removed making maintenance difficult

Engineering Contradiction:

Improveintegrity of diaphragmVSAvoidease of valve core assembly installation

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The rotational limiting function is extracted from the clamping mechanism and implemented as a separate limiting device with groove-protruding member engagement. This allows the clamping surface to remain free and accessible, eliminating the need to remove the spring cartridge while still preventing excessive drive shaft rotation and protecting the diaphragm.

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of operation

If the drive shaft is allowed to rotate freely during nut screwing, then the valve core assembly can be installed, but the sensing device may be damaged due to excessive rotation

Engineering Contradiction:

Improveease of valve core assembly installationVSAvoiddamage to sensing device

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The limiting device acts as an intermediary between the drive shaft and the nut. The groove and protruding member engagement provides a mechanical interface that allows controlled rotation during installation while automatically preventing excessive rotation, thus protecting the sensing device without interfering with the installation process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9645587B2Driving apparatus and valve including the same

Publication Date: 2017.05.09 EMERSON PROCESS MANAGEMENT REGULATOR TECHNOLOGIES INC

AI summary

A driving apparatus and a valve including the same. The driving apparatus senses a pressure of a fluid medium and generates a driving force. The driving apparatus includes: a drive shaft, a sensing device, a limiting device, a support body, and a protruding member. The limiting device includes a groove, and the protruding member is engaged in the groove. The limiting device can thus automatically limit the rotation of the drive shaft, so as to avoid damaging the sensing device, thereby facilitating maintenance and installation of the valve.