Spring Check Valves VS Swing Check Valves
2024-10-11
Spring Check Valves VS Swing Check Valves
Spring Check Valves VS Swing Check Valves
Spring Check Valves
A spring check valve is a type of check valve that allows fluid to flow in one direction while preventing reverse backflow. It is mainly made of brass, bronze and stainless steel and is resistant to corrosion. It relates to the application of water or other non-corrosive liquids. The valve uses a spring mechanism. It provides the force to keep the valve closed and prevent reverse flow. As the fluid flows in the desired direction, the pressure lifts the valve from its seat, allowing passage. However, when the flow reverses or stops, the spring pushes the valve back into its seat. It will prevent any backflow.
Spring check valves come with two types of seals, metal seats and soft seats.
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Soft valve seats are usually made of thermoplastic materials such as VITON or PTFE. They are well-suited for applications where chemical compatibility is important for tight sealing. It helps achieve high levels of sealing performance. However, soft valve seats are not recommended for dirty or abrasive process fluids, as the seals will break and cause the valve to leak in such cases.
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Metal seat valves can withstand high temperature, working pressure and harsh working conditions. Metal seats withstand severe flash edges, abrasive process fluids, hydraulic shocks, and temperatures up to 537°C (1,000°F). They are suitable for high erosion or corrosive applications. However, it is easy to leak because of its relatively poor sealing performance between metals.
Benefit
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Stronger backflow protection
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Can be installed in any flow direction
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Quieter operation compared to swing check valves
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More heat and cold resistant than swing check valves
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Minimize the sound and damaging effects of water hammering
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Reduce system stress and create a safer environment
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Provides fast flow interruption and forward sealing at low pressure
Disadvantage
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May create greater flow resistance
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Usually more expensive than swing check valves
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Lower flow compared to swing check valves
Applications
Spring check valves are suitable for low-risk applications where zero return is required
