Pilot Valve Spool Positioning Against Gas Pressure
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Solution Overview
Problem
The reciprocating piston pump's switching valve movement is incomplete when either pilot valve is pressed, causing the valve to stop halfway, leading to failure in supplying and venting gas, and subsequently halting the pump's operation.
Innovation Solution
A pilot valve design with a first resilient member capable of positioning the first spool against gas pressure and a second resilient member with a weak force to ensure the second spool moves reliably, along with metal-to-metal sealing between the spools to maintain differential pressure and prevent valve stagnation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resilient member is used to position the spool against gas pressure, then the spool positioning reliability is improved, but the device complexity increases due to additional components
Solution Approach 1:
A resilient member is introduced as an intermediary element between the spool and the valve body. This resilient member actively pushes the spool toward the opened state, serving as a mediator that ensures reliable spool positioning against gas pressure without requiring complex mechanical constraints or additional actuation mechanisms.
2Speed
If the resilient force is strong to ensure spool movement, then the spool response speed is improved, but the difficulty of spool return to initial position increases
Solution Approach 1:
The resilient member provides periodic or cyclic action by continuously pushing the spool toward the opened state during each operation cycle. When gas pressure decreases, the spool naturally returns to its initial position, creating a periodic motion pattern that ensures both rapid response and easy return without requiring additional return mechanisms.
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
Ensures reliable movement of the switching valve, maintaining differential pressure and preventing valve stagnation, thus enabling continuous gas supply and venting, ensuring the reciprocating piston pump operates smoothly.
Implementation Method 1
a first resilient member disposed at an other end of the first spool opposite to the opening side of the valve body to urge the first spool toward the opening side of the valve body
Implementation Method 2
a second resilient member disposed at an other end of the second spool opposite to the opening side of the valve body to urge the second spool toward the opening side of the valve body with a weak resilient force
Implementation Method 3
the resilient force of the first resilient member is stronger than a force with which compressed gas presses an opening-side end of the first spool toward a side of the valve body opposite to the opening side
Data Source
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AI summary
Provided is a pilot valve for reliably moving a switching valve of a gas control valve. A pilot valve 80 of the present invention includes a bottomed cylinder-shaped valve body 84 having an opening 81d at one end thereof, spools 85 and 87 slidably accommodated in the valve body 84, and resilient members 86 and 88 disposed at other ends of the spools 85 and 87 opposite to the opening 81d side of the valve body 84 to urge the spools 85 and 87, respectively, toward the opening 81d side. The valve body 84 has at least three through-hole portions 81a substantially equally spaced in a longitudinal direction of the valve body. The spools 85 and 87 allow communication between at least two mutually adjacent through-hole portions 81a of the valve body 84. The resilient members 86 and 88 are configured to press the spools 85 and 87 toward the opening 81d side of the valve body 84 in cooperation with a pressing device, thereby switching the spools 85 and 87 from a state where the spools 85 and 87 are positioned at a side of the valve body 84 opposite to the opening 81d side to a state where the spools 85 and 87 are positioned at the opening 81d side.