Globe valves, check valves, safety valves, control valves, etc designed for gaseous oxygen service. These valves are made of suitable materials and have specific features such as extended stem and remote handwheel for installation behind a barrier, throttling plug, etc. They are mainly used in steel plants.
Echinodermata: Morphology. Echinoderms have been compared to living, moving castles. Castles are made of interlocking blocks, with a single main entrance and numerous slit windows for air and for defense.Echinoderm skeletons are made up of interlocking calcium carbonate plates and spines.This skeleton is enclosed by the epidermis and is thus an endoskeleton.astles are made of interlocking blocks, with a single main entrance and numerous slit windows for air and for defense. Echinoderm skeletons are made up of interlocking calcium carbonate plates and spines. This skeleton is enclosed by the epidermis and is thus an endoskeleton.
An echinoderm is a sea animal that has a hard spiny shell, or exoskeleton. Echinoderms display radial symmetry, having 5 similar body extensions from a central point.  The se â¦ ven classes of echinoderms are brittle stars, basket stars, sea urchins, sand dollars, sea lilies, feather stars, and sea cucumbers.chinoderms have swimming larvae that are bilaterally symmetrical, with left and right sides, but they do not 'develop into' bottom-living adult echinoderms, which are radiall â¦ y symmetrical, often star-shaped. The juvenile (young adult), radial from the start, grows from a group of stem cells within the larva.