| http://www.w3.org/ns/prov#value | - II??? Listed in ASTM Specifications??? Controlled by the manufacturer of the pressure relief valve by a spec- ification ensuring control of chemical and physical properties and quality at least equivalent to ASTM standardsCast iron is not permitted to be used in construction of seats and disks.Adjacent sliding surfaces such as guides and disks or disk holders shouldbe of corrosion-resistant materi
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