Pressure Reducing Valve Vibration Damping via Differential Piston Control
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Solution Overview
Problem
Rapid pressure variations in pressure reducing valves lead to vibrations such as hunting and chattering, causing abnormal noise in the needle valve member, pressure reducing member, and pressure receiving piston.
Innovation Solution
A pressure reducing valve design where the pressure receiving piston's movement is slowed by a differential pressure force, preventing rapid pressure changes in the outlet chamber, featuring a throttle portion between the piston hole and pressure receiving piston, and a check valve to control fluid flow, reducing the speed of piston advancement and preventing rapid pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the pressure receiving piston is allowed to move rapidly in response to pressure changes, then the response speed of the pressure reducing valve is improved, but vibration phenomena such as hunting and chattering occur causing abnormal noise
Solution Approach 1:
A dashpot mechanism is introduced as an intermediary between the pressure receiving piston and the pressure reducing member. This dashpot contains viscous fluid that resists rapid piston movement, thereby suppressing vibration and hunting phenomena while still allowing the piston to respond to pressure changes. The viscous fluid acts as a mediator that dampens the direct coupling between pressure changes and piston motion.
Solution Approach 2:
The dashpot mechanism changes the effective mass and damping parameters of the pressure receiving piston system. By introducing viscous resistance, the system's dynamic characteristics are modified to reduce oscillation amplitude and frequency, thereby suppressing hunting and chattering while maintaining adequate response speed.
2Device complexity
If a simple structure is used for the pressure reducing valve, then the device complexity is reduced, but vibration suppression mechanisms become insufficient
Solution Approach 1:
The dashpot mechanism is merged with the existing pressure receiving piston assembly. The piston moves within the same cylindrical chamber, and the viscous fluid is contained within the same space, combining two functions (pressure reception and vibration damping) into a single integrated component rather than adding separate external damping devices.
Solution Approach 2:
The pressure receiving piston is given dual functionality: it serves both as the pressure-sensing element that controls the pressure reducing member and as a damped oscillating element that suppresses vibration through the viscous fluid. This multi-functionality reduces the need for separate vibration damping components.
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 effectively suppresses vibrations and noise by slowing the advancement of the pressure receiving piston, preventing rapid pressure rises and drops, thus reducing chattering and hunting phenomena.
Implementation Method 1
the pressurized fluid in the outlet chamber slowly flows into the fluid chamber through the throttle portion in the second passage
Implementation Method 2
the pressurized fluid in the fluid chamber flows out to the outlet chamber through the first passage
Implementation Method 3
a force due to the pressure differential between the pressure in the outlet chamber and the pressure in the fluid chamber is applied to the pressure receiving piston toward the other end side
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
There is provided a pressure reducing valve in which phenomena of vibration occurring with respect to a pressure reducing member and/or a pressure receiving piston are reliably dampened. When a pressure receiving piston (19) is advanced rightward to increase the volume of a fluid chamber (28) defined by the pressure receiving piston (19) and a piston hole (18), the pressure in the fluid chamber (28) drops to close a check valve (34), and the pressurized fluid in an outlet chamber (10) flows into the fluid chamber (28) through a throttle portion (31). When the pressure receiving piston (19) is retracted leftward to reduce the volume of the fluid chamber (28), the pressure in the fluid chamber (28) rises to open the check valve (34), and the pressurized fluid in the fluid chamber (28) flows out to the outlet chamber (10).