Valve Rod Venting for Pressure-Equalized Gas Regulator Shut-Off
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Solution Overview
Problem
Gas pressure regulators experience force imbalances due to internal pressure differences, leading to vibrations and potential failure, particularly in industrial environments where high pressures and varying physical parameters affect the stability and longevity of the devices.
Innovation Solution
Incorporating a vent chamber and vent line within the valve rod to establish pressure equalization between internal and ambient pressures, allowing for fluid communication between the vent chamber and the outside housing, thereby reducing the forces exerted on the valve rod and maintaining equilibrium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the valve rod intrudes into the high pressure housing, then the valve can control the fluid in the internal chamber, but the pressure difference causes unbalanced forces on the valve rod
Solution Approach 1:
A vent chamber is introduced as an intermediary space between the high-pressure internal chamber and the ambient environment. The vent chamber receives ambient air and uses it to counterbalance the pressure forces acting on the valve rod, thereby mediating the force imbalance caused by the pressure difference across the valve rod surface.
Solution Approach 2:
The pressure parameter around the valve rod is changed by introducing ambient air into the vent chamber. This creates a pressure equalization effect where the ambient pressure in the vent chamber counteracts the high internal pressure, reducing the net force on the valve rod while maintaining the valve's control capability.
2Stress or pressure
If the valve rod cross-sectional area is increased, then the valve can handle higher pressures, but the pressure imbalance creates exponentially larger forces
Solution Approach 1:
The pressure distribution parameter is changed by introducing the vent chamber that fills with ambient air. This equalizes the pressure acting on different surfaces of the valve rod, allowing the valve rod to be designed with adequate cross-sectional area for pressure handling without experiencing exponentially increased unbalanced forces.
3Reliability
If the vent line is located in the center of the valve rod, then ambient air can be effectively communicated to the vent chamber, but the valve rod structure becomes more complex
Solution Approach 1:
The valve rod is designed to serve multiple functions: it acts as both the control element for the valve and as the structural housing for the vent line. By locating the vent line in the center of the valve rod, the same component (valve rod) performs both the fluid control function and the pressure equalization function, thereby reducing overall device complexity despite the internal vent line structure.
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 solution effectively reduces the forces experienced by the valve rod, stabilizes the gas pressure regulator, and extends its operational lifespan by mitigating vibrations and humming issues, ensuring reliable pressure regulation in industrial processes.
Implementation Method 1
The vent chamber receives ambient air and maintains pressure equalization of the ambient air and the fluid within a maximum pressure of the fluid
Implementation Method 2
The vent line is located in a center of the valve rod and provides fluid communication of the ambient air between the vent chamber and an outside of the housing
Data Source
AI summary
An apparatus includes a safety shut-off valve for use with a gas regulator. The safety shut-off valve includes a housing, a valve rod, a vent chamber, and a vent line. The housing includes an interior chamber configured to regulated pressure in a fluid. The valve rod is disposed in the housing and controls a valve for interrupting the fluid in the internal chamber. The vent chamber receives ambient air and maintains pressure equalization of the ambient air and the fluid within a maximum pressure of the fluid. The vent line is disposed in a center of the valve rod and provides fluid communication of the ambient air between the vent chamber and an outside of the housing.