The design of the silent check valve revolves around three major elements: slow closing, shock absorption, and sealing. By using mechanical or hydraulic devices to achieve controllable closing speed, combined with optimized fluid channels and soft sealing materials, a silent effect can be achieved. Applied in systems that require low noise and anti vibration, it enhances the stability and safety of the overall pipeline system.

Working principle description:

Positive flow (opening): The medium flows forward, and the pressure overcomes the spring force (and/or hydraulic damping force) and the self weight of the valve disc, pushing the valve disc to open smoothly. Smooth flow channel with low resistance.
Flow rate reduction/start reverse flow (slow closing start): When the pump stops or the flow rate significantly decreases, the force pushing the valve disc to open weakens. The slow closing mechanism (spring, damper) begins to dominate the closing process, resisting the backflow medium or gravity, causing the closing to start slowly.
Controllable speed closure: Under the control of the slow closing mechanism (gradual release force of the spring, or damping force of hydraulic oil flow through the throttle hole), the valve disc moves towards the valve seat at a set, lower speed. This speed is much lower than the speed of free fall or backward propulsion.
Gentle sealing: The valve disc gently adheres to the soft seal valve seat at a slow speed. Due to its low speed, the impact energy is absorbed by the soft seal, resulting in almost no noise or vibration. Meanwhile, the soft seal ensures a reliable sealing effect.
Summarize the design essence of silent check valves:

Active slow closing ": It does not rely on sudden reverse flow impact to close, but actively and forcibly slows down the closing speed through built-in energy storage (spring) and/or energy dissipation (hydraulic damping) mechanisms.
Low speed sealing ": The core goal is to allow the valve disc to contact the valve seat at almost zero speed, achieving impact free sealing.
Soft landing ": Combining soft sealing materials to absorb residual impact energy and further eliminate noise.
Stable guidance: Ensure precise closure path and avoid lateral impact.

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