Repairable Cartridge Valve With Modular Operator And Replaceable Seal
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Solution Overview
Problem
Existing air pilot cartridge valves face issues with leakage under high back pressure, require large diameters for effective operation, have non-replaceable poppet seals, and are difficult to repair, limiting their installation options and lifespan, especially in tight spaces and when used with viscous fluids.
Innovation Solution
A cartridge valve design featuring a dual piston operator, a replaceable PolyPak seal, and a modular structure allowing independent rotation of the cartridge section, enabling easy maintenance and installation in tight spaces, with a design that resists backpressure and allows for the replacement of seals without specialized tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a large diameter air pilot operator is used to provide sufficient force against high back pressure, then the valve can operate against high back pressure, but the valve size increases and installation options are limited
Solution Approach 1:
The valve is divided into separate modular sections: a cartridge section containing the poppet and seal, and an operator section containing the air pilot operator. This segmentation allows the operator to be optimized for force generation while the cartridge section maintains a compact size for tight installation spaces.
Solution Approach 2:
The operator section is designed to rotate independently on the cartridge section, adding rotational freedom as an additional degree of freedom. This allows installation in tight spaces where the operator can be positioned and rotated into the correct orientation without requiring large linear adjustment spaces.
2Ease of manufacture
If the valve is designed as a integrated unit with press-fit construction, then manufacturing is simplified, but the poppet seal becomes non-replaceable and the valve is considered disposable
Solution Approach 1:
The valve is segmented into a cartridge section and operator section that can be easily separated. The cartridge section contains the poppet and seal as a removable assembly, allowing the seal to be replaced without replacing the entire valve or requiring complex disassembly procedures.
Solution Approach 2:
The retention system uses movable set screws that can be adjusted to secure or release the cartridge section from the operator section. This dynamic retention mechanism allows for easy assembly and disassembly during maintenance while maintaining a secure fixed connection during operation.
3Stability of the object's composition
If the operator and cartridge section are rigidly fixed together, then structural stability is improved, but independent rotation is prevented and installation flexibility is reduced
Solution Approach 1:
The connection between operator and cartridge sections transitions from rigid to semi-rigid: during installation and maintenance, the sections can be independently rotated and easily separated using adjustable set screws; during operation, the sections are securely fixed together to provide structural stability.
Solution Approach 2:
The set screws are periodically adjusted to transition the connection state: loosened during installation/maintenance to allow rotation and separation, and tightened during operation to provide rigid structural stability. This periodic adjustment of the connection state resolves the contradiction between stability and flexibility.
Data Source
AI summary
A cartridge valve comprises an operator section for operating a valve, and a cartridge section with the valve. The operator section includes a first body and two pistons on a common shaft. The cartridge section includes a second body with valve seat, a cartridge insert having a protruding portion with annular ring, and a valve poppet operably engaging the valve seat. Two retainer screws engage the annular ring to hold the first and second bodies longitudinally together but permit rotation. The piston shaft defines a gap to the valve poppet when in a home position so that the shaft and piston initially gain momentum before abutting the valve poppet. The cartridge insert can be removed from the second body to allow replacement of a poppet seal therebetween.