Features：

It's serviced in the circumstance where the heat preservation of fluid is needed, such as the equipment of polyester, ethylene, urea, etc.Body including inlet and outlet flanges is heat preserved, so the effect is verywell. The function of double flushing can beadded, if needed.Balanced bellows construction protect set pressure from being affected by variable back pressure, and the parts in bonnet, such as spring, from being corroded.Trim(nozzle and disc) is normally made with austenitic stainless steel, and faced with stellite alloy.To meet specisl service, the material of trim can be 316LN, 0Cr25Ni6Mo3CuN,00Cr25Ni6Mo2NF51(UNS S31803)、F53(UNS S32750)、F55(UNS S32760).