Latching Poppet Valve for Hydraulic Directional Control
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Solution Overview
Problem
Traditional sub-plate mounted hydraulic directional control valves require continuous pilot pressure to maintain position, leading to reduced reliability, increased operational costs, and higher risk of leaks or service interruptions due to the need for large volumes of pressurized fluid in high-flow, high-pressure applications.
Innovation Solution
A hydraulic three-way directional control valve design featuring a movable poppet and cage mechanism, where pressures at pilot inlets control the poppet's position, allowing the valve to remain in the last position without continuous pilot pressure, utilizing relative diameters of sealing surfaces and pistons to bias the poppet against complementary sealing faces, ensuring fluid communication or isolation between ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional SPM spring return valve designs are used to control high flows and high pressures, then the valve can maintain position with continuous pilot pressure, but the reliability is reduced and operational costs increase due to the need for large volumes of pressurized fluid
Solution Approach 1:
The valve is designed to preliminarily establish a latching mechanism where the poppet is biased against sealing surfaces by spring force and pressure differential. When pilot pressure is applied, it overcomes this preliminary bias to move the poppet to the desired position, where it then latches without requiring continuous pilot pressure maintenance.
Solution Approach 2:
The valve utilizes its own operating pressure and spring force to maintain the poppet in the latched position. The design allows the valve to self-maintain position through the interaction of spring bias, pressure differentials across the poppet, and friction against sealing surfaces, eliminating the need for external continuous pilot pressure.
2Ease of operation
If continuous pilot pressure is maintained to keep the valve in operating position, then the valve remains open or closed as needed, but the operational costs increase and risk of leaks or service interruptions increases
Solution Approach 1:
Instead of continuous pilot pressure application, the system uses periodic or transient pressure pulses to change valve position. The poppet is moved to the desired position by a momentary pilot pressure signal, then latches and maintains position without continuous pressure input, converting continuous action to periodic action.
Solution Approach 2:
The design replaces the hydraulic pilot pressure maintenance system with a mechanical latching mechanism involving spring force, pressure differentials, and friction against sealing surfaces. This mechanical self-latching system substitutes for the continuous hydraulic control system.
3Adaptability or versatility
If traditional SPM valves are used in large numbers in BOP control systems, then comprehensive control is achieved, but the adverse effect on hydraulic pilot control circuit reliability increases
Solution Approach 1:
The invention extracts the continuous pilot pressure requirement from each individual valve. By designing each valve to latch without continuous pilot pressure, the cumulative reliability burden on the central pilot control circuit is eliminated, allowing multiple valves to operate independently without compounding reliability risks.
4Measurement precision
If the valve design requires continuous pilot pressure to maintain position, then precise control is achieved, but the mean time between failure is reduced
Solution Approach 1:
The valve incorporates spring force and friction-based latching as a cushioning mechanism that protects against failures. The spring provides a bias force that ensures the poppet returns to a safe position if pilot pressure is lost, and the friction against sealing surfaces provides a cushion that prevents abrupt movements, thereby increasing mean time between failure.
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 reduces the need for continuous pilot pressure, enhancing reliability and reducing pressurized fluid volumes required, thereby lowering operational costs and minimizing the risk of leaks or service interruptions while maintaining flow capacity equivalent to traditional valves.
Implementation Method 1
Pressures at the first and second pilot inlets control the position of the valve poppet in the body
Implementation Method 2
the relative diameters of the sealing surface of the poppet to the interior sealing surface of the valve, and the diameter of opposed pilot pistons, which face either the supply pressure or the vent pressure, causes a sealing surface of the poppet to be biased against a complimentary sealing surface of the valve
Data Source
AI summary
A directional control valve for selectively communicating a valve outlet to one of a vent port and a pressure supply port includes a poppet extending through a cage. Relative positioning of the poppet to the cage selects which of the vent and pressure supply port is communicated to the valve outlet. The poppet position relative to the cage is provided by supplying fluid pressure to one of the opposed sides thereof, and the poppet latches with the cage so that the fluid pressure on one of the sides of the poppet need not be maintained to maintain the poppet position in the valve.