I have a 10ft Diameter sloped bottom Carbon Steel API 620 storage tank that rests on an elevated concrete foundation with leak detection grooves that was constructed in 1991. Between the tank bottom and the concrete foundation is a 1/2" Asphalt Impregnated board. Over time the Asphalt board has...
Can I get some help from the experts on identifying what type of valve this is? My initial thoughts were a Globe Check valve. The identification tag is long gone.
Thanks!