Pilot Check Valve with Integrated Detector
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pilot check valves lack the ability to detect whether the valve is in a closed state, leading to uncertainty in maintaining the cylinder's position, as the position of the pilot piston does not reliably indicate the state of the poppet valve plug.
Innovation Solution
A pilot check valve design featuring a movable body with an elastically deformable packing that includes an inclined lip, which makes sliding contact with the flow passage body, and a detector to confirm the valve's closed position, ensuring fluid flow control even without pilot pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pilot piston and poppet valve plug are provided separately, then the valve structure is simpler, but the position of the pilot piston does not reliably indicate the state of the poppet valve plug, making it impossible to detect whether the valve is closed
Solution Approach 1:
The packing is integrated with the movable body to form an integral structure, ensuring that they move together as a single unit. This merging eliminates the relative movement and positioning issues between separate components, allowing the detector to accurately determine the valve closed state by monitoring the position of the movable body, which directly reflects the position of the packing.
2Reliability
If the poppet valve plug is elastically urged by a spring, then the valve can automatically close to prevent cylinder dropping, but there is no function to detect when the valve has closed
Solution Approach 1:
A detector is introduced to monitor the position of the movable body and provide feedback information about the valve closed state. The detector generates signals that indicate whether the valve is closed, enabling the control system to obtain real-time information about the valve state and make appropriate control decisions.
3Reliability
If the packing is made elastically deformable, then it can seal effectively against the flow passage body, but the durability may be reduced due to repeated deformation
Solution Approach 1:
The elastic modulus and material properties of the packing are optimized to achieve the right balance between deformability for sealing and durability for longevity. By carefully selecting and tuning the material parameters, the packing can undergo repeated deformation cycles while maintaining both sealing effectiveness and structural integrity over time.
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
Enables reliable detection of the valve's closed state, preventing cylinder drops by ensuring accurate fluid flow control and enhancing the durability of the packing through a support member.
Implementation Method 1
the packing including an inclined lip which is elastically deformable radially, the lip being configured to make sliding contact with an inner circumferential surface of the flow passage body
Implementation Method 2
a detector configured to detect whether or not the movable body is placed at a position that causes the packing to be positioned at the valve closed position
Implementation Method 3
a poppet valve plug that is elastically urged toward a valve seat by a spring
Implementation Method 4
a pilot piston facing the poppet valve plug and which is disposed slidably in an axial direction thereof. The pilot piston presses the poppet valve plug when a pilot pressure is applied
Data Source
AI summary
A pilot check valve includes: a fluid channel body; a moveable body that moves in an axial direction under effects of pilot pressure; a packing including a lip portion that is displaceable, integrally with the moveable body, between a valve close position and a valve open position; and a detector to detect position of the moveable body. The packing, in the valve close position, allows flow of an operating liquid from a first port side of the fluid channel body to a second port side and prevents the flow of the operating liquid from the second port side to the first port side, and in the valve open position, connects the first port and the second port.