Diaphragm Control Valve with Intermediate Chamber for Pressure Stability
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Solution Overview
Problem
Diaphragm-type fluid control valves require additional components like check valves to manage pressure differences between fluid volumes, which complicates installations and increases component count in systems like preaction fire protection systems.
Innovation Solution
A fluid control valve design with an internal diaphragm that axially separates two chambers with an intermediate chamber at atmospheric pressure, eliminating the need for downstream check valves by providing a single, constant pressure between the control valve and the network of sprinklers, and incorporating a diaphragm chamber for controlled operation and pressure compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve is added downstream of the diaphragm control valve to manage pressure differences, then pressure control reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the check valve function into the diaphragm control valve body by creating a sealed intermediate chamber that prevents backflow. The diaphragm valve body itself becomes the check valve through the sealed chamber design, eliminating the need for a separate downstream check valve and reducing overall device complexity while maintaining pressure control reliability
Solution Approach 2:
The invention nests the check valve functionality within the diaphragm control valve structure. The intermediate chamber is sealed within the valve body, creating a nested configuration where the pressure management function is embedded inside the main valve assembly rather than being a separate external component
2Reliability
If a check valve is added downstream of the diaphragm control valve, then pressure management is improved, but the number of components increases
Solution Approach 1:
The patent combines multiple functions into a single valve body: the diaphragm control mechanism and the check valve function are merged into one integrated component. The sealed intermediate chamber within the valve body provides check valve functionality without requiring a separate downstream check valve, thereby reducing the total number of components in the system
3Manufacturing precision
If multiple valves are used to control pressure and flow, then flow control precision is improved, but ease of operation deteriorates
Solution Approach 1:
The diaphragm control valve is designed to perform multiple functions simultaneously: flow control through the diaphragm mechanism and pressure management through the sealed intermediate chamber. This multi-functional design eliminates the need for separate valves for different functions, making the system easier to operate while maintaining precise flow and pressure control
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 reduces the number of moving components, simplifies assembly and service, and ensures reliable performance by consolidating sealing and monitoring functions within a single valve, compliant with installation standards, while minimizing the risk of false trips and component failure.
Implementation Method 1
a flexible member engaged with the inner surface to dissect the passageway... a diaphragm member disposed within the chamber for controlling communication between the inlet and the outlet
Implementation Method 2
an intermediate chamber in between... exposed to atmosphere so as to define an alarm port for detecting a breach
Data Source
AI summary
A diaphragm-type control valve having a diaphragm and a valve body is provided preferably for use in the separation of and fluid control between a fluid source and a pressurized gas volume. The diaphragm element and a port in the body together form an intermediate chamber that eliminates the need for a check-valve downstream of the valve. In one preferred embodiment, an inner surface of the valve body defines a chamber having an inlet and an outlet in communication with the chamber, and an elongated seat member defining a groove in communication with the port. A diaphragm member having upper and lower surfaces is disposed within the chamber. The lower surface preferably includes a pair of spaced apart elongated members defining a channel therebetween. The diaphragm member engages the seat member placing the channel in communication with the groove to define an air seat in communication with the port.