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Installation and Maintenance Best Practices for Loose Flange Connections

Installation and Maintenance Best Practices for Loose Flange Connections

Apr 09,2024

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Cast Iron Check Valves

What Is A Swing Check Valve with Cast Iron Coating?

Cast iron swing check valves are a kind of swing check valve with a body made of gary or ductile cast iron. They're belong to the group of automatic valves, which are used mostly in pipelines where the medium flows in one direction and allow only the medium to flow in one direction to avoid accidents. The pressure drops and turbulence in these types of valves are very low. This type of valve should generally be installed horizontally in the pipeline, but it can also be installed vertically by keeping in mind that the disc cannot reach the stalling position where the disc stuck in an open position.

Cast Iron Swing Check Valve VS Cast Iron Spring Check Valve

  1. One difference between these types of check valves is how they allow and prevent flow. A swing check valve uses a flapper that 'swings' off the seat to allow forward flow and then swings back onto the seat when the flow is stopped. In contrast, a spring loaded check valve incorporates a spring to assist in closing the valve.  

  2. Swing check valves are limited in the orientation in which they can be installed. These type of check valves can only be installed in horizontal flow applications, which greatly limits the applications where they can be used. While swing check valves do offer a larger flow capacity, they may not always fit in existing piping configurations. On the other hand, spring loaded check valves can be mounted in any flow orientation with the right spring selection. In you need a check valve for a process skid, a difficult space with challenging dimensions, or even unique direction of piping, choosing a spring check valve with the proper spring setting (spring cracking pressure) provides more possibilities for finding the right solution for your specific flow control application.

  3. Any water hammering effects present in a piping system can potentially be amplified by a swing check valve. Installing a spring loaded check valve can prevent effects of water hammer; whereas a swing check valve can exacerbate the issue. Spring check valves are considered "silent check valves" by utilizing a spring to assist the poppet in closing the check valve prior to fluid flow reversal. 

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