1. it¡¯s serviced in the circumslance where the heat preservation of fluid is needed,such as equipment of polyester,ethylene,pitch, urea,etc.
2. Body including inlet and outlet flanges is heat prserved,the effect is very well the fu nction of
vapor flushing be added,if needed.
3. Balance bellows construction protects set pressure from being affected by variable back
pressue ,and the parts in bonnet,such as spring ,form being corroded.
4. Trim ( nozzle and disc) is normally made with austenitic stainless steel ,and faced with stellite
alloy.