Goodwin International Extends its Range of Non-Slam Axial Check Valves
axial check valve, to operate at their optimum performance and provide longevity of service, should operate in the fully open position to guarantee stable, chatter-free operation. Check valves that operate under partially open conditions will flutter and, in low flow conditions, chatter. Chatter, in particular, is detrimental to check valves as it causes excessive wear and, consequently, premature failure.
Compressor applications are those that present the challenge where incorrect check valve selection can have catastrophic consequences. Due to the range of possible flow conditions where low gas flowrates are a high probability, correct selection of the check valve for compressor discharge service is crucial. Low gas flowrates, with the wrong check valve, can lead to chatter and premature failure of the check valve, thereby exposing the expensive compressor equipment to significant risk of damage.
The preferred solution for compressor applications is the installation of nonslam axial (nozzle) check valves. These can withstand partial open operation more so than the non-axial types such as swing, tilting disc, and dual plate check valve types which have the highest risk of chattering under low flow conditions. However, it is still recommended the axial check valve is fully open under all flow conditions where possible.
Historically, there have been two basic designs for axial non-slam check valves: solid disc and ring disk. Both types are offered by Goodwin – the Type Z solid disc (to 10”) and the Type N ring disk (12” and larger). The Type Z solid disc is centrally guided and seated using a single spring whereas the Type N is mounted on a frictionless radial guiding system with multiple springs.
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