Pilot-Operated Check Valve Opening With Closed-State Indication
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Solution Overview
Problem
Pilot-operated check valves face inefficiencies due to high pressure differentials, which can lead to large pressure drops and failure to open at required pressure levels, and lack of clear indication for closed positions, posing safety and operational challenges.
Innovation Solution
A pilot-operated check valve with a position indicator, featuring a poppet and pilot piston mechanism that operates in two modes based on pressure differentials and pilot fluid signals, and includes a magnetic sensor system to confirm valve position and mode of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve requires a large pressure differential to open, then the valve can maintain reliable closed state, but the pressure drop across the valve becomes large and efficiency decreases
Solution Approach 1:
A pilot piston is introduced as an intermediary mechanism that translates small pilot pressure changes into large poppet displacement. The pilot piston with larger surface area creates mechanical advantage, allowing the poppet to overcome the spring force and open the valve with minimal pressure differential between ports, thereby reducing energy loss while maintaining reliable closing
2Reliability
If the pressure level at the second port is kept high to ensure valve opening, then the valve can open reliably, but the required pressure level becomes too high and the valve may remain closed under normal conditions
Solution Approach 1:
The pilot piston acts as a pressure amplifier and translator. By applying a moderate pilot pressure to the larger pilot piston surface area, a sufficient force is generated to move the poppet and open the valve, eliminating the need for excessively high pressure at the second port while ensuring reliable opening under normal operating conditions
3Reliability
If no position indicator is included, then the valve structure remains simple, but there is no indication of closed state for safety purposes
Solution Approach 1:
A position indicator with distinct visual markings is provided on the valve body or actuator to clearly indicate the closed and open states of the valve. This visual signaling system allows operators to quickly determine valve status without adding complex electronic sensors or indicators, maintaining structural simplicity while enhancing safety
Solution Approach 2:
The position indicator provides immediate visual feedback about the valve state to the operator or control system. This feedback mechanism ensures that the closed state is clearly confirmed, enabling safe operation and proper control system response without requiring complex detection systems
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 valve efficiently allows fluid flow with minimal pressure differential and provides reliable position indication, ensuring safe load holding and efficient hydraulic system operation by confirming the valve's closed state and mode of operation.
Implementation Method 1
a magnetic sensor system to confirm valve position and mode of operation
Data Source
AI summary
An example valve includes: a first port; a second port; a third port; a poppet configured to be subjected to (i) a first fluid force by fluid of the first port acting on the poppet in a proximal direction toward a poppet seat, and (ii) a second fluid force by fluid of the second port acting on the poppet in a distal direction; a pilot piston configured to be subjected to a pilot fluid force by a pilot fluid signal received at the third port; a check spring applying a spring force on the poppet in the proximal direction; and pilot spring applying a pilot spring force on the pilot piston in the proximal direction.