Relief Valve Lockout Lever for High-Pressure Testing
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Solution Overview
Problem
Existing pressure relief valves in fire protection systems face challenges in remaining closed during normal operation in high-pressure environments while reliably opening at higher pressures, and their testing at elevated pressures is cumbersome and costly due to the need for additional valves or system modifications.
Innovation Solution
A relief valve with a lockout lever mechanism that compresses a spring to increase the cracking pressure, allowing the valve to remain closed during testing at higher pressures, and includes a flexible disk and lever arm for fluid communication, enabling easy testing without additional components or system changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relief valve is designed to open at high pressure to prevent system damage, then the valve provides reliable pressure protection, but the valve opens during system testing at elevated pressures
Solution Approach 1:
The lockout lever is activated before system testing to preliminarily increase the cracking pressure above test pressure levels. This preliminary action ensures the valve remains closed during testing while maintaining its protective function at higher operating pressures.
Solution Approach 2:
The lockout lever mechanism changes the cracking pressure parameter by compressing the spring further than normal operation requires. This parameter change allows the valve to withstand test pressures without opening, while still opening at significantly higher pressures for pressure relief.
2Reliability
If additional valves are installed to isolate pressure relief valves during testing, then the relief valves remain closed during testing, but the system complexity and cost increase
Solution Approach 1:
The lockout lever serves multiple functions: it maintains normal valve operation during regular use and increases cracking pressure during testing. This multi-functionality eliminates the need for separate isolation valves, reducing system complexity while achieving the same testing capability.
Solution Approach 2:
The testing control function is merged with the existing lockout lever mechanism rather than requiring a separate valve. This consolidation integrates the testing capability into the valve assembly itself, reducing the number of components and simplifying the overall system.
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
The solution provides a reliable, high-pressure rated relief valve that remains closed during normal operation and opens only at significantly higher pressures, facilitating easy system testing without the need for additional valves or system modifications, thus reducing costs and complexity.
Implementation Method 1
a spring coupled to the spring rod, providing a bias force against the plunger assembly to normally close the relief valve
Implementation Method 2
the lockout lever is moved to pivot on the vertex against the support member to further compress the spring
Data Source
AI summary
A relief valve has a valve body, a plunger assembly coupled to the valve body for selectively opening and closing the relief valve, and a support member secured to the valve body. A lockout lever is against the support member, forming a vertex. A spring rod is coupled to the lockout lever, and a spring is coupled to the spring rod, providing a bias force against the plunger assembly to normally close the relief valve. In a lockout position, the lockout lever is moved to pivot on the vertex against the support member to further compress the spring, which increases the bias force and, in turn, a cracking pressure of the relief valve.