SPECIALTY CONTROL VALVES FOR UREA PLANTS - Parcol

SPECIALTY CONTROL VALVES FOR UREA PLANTSPARCOL1-4829 (with PACKING WASHING)Model 1-4829 control valves are similar to model1-4827 but with a particular guide and packing design.As well known to instrument Engineers who work onurea plants, the crystallization of urea into packing boxchamber result in detrimental effects both on integrityof packing sealing rings and polished surface of plugstem.The combined effects of continuous washing device ofupper part of packing box chamber with hot water atlow pressure and special hardening and polishing ofplug stem surface will avoid crystallization and packingleaks, and guarantee longer trouble-free-life of all trimand packing parts.For main specifications please refer to the ones ofmodel 1-4827 except for packing box construction withadditional proprietary device for continuous washing ofupper part of packing box chamber.1-4824 (ANTI CAVITATION TRIM)Model 1-4824 urea control valves are equal to model1-4827 except for specialty two stages trim expresslydesigned to avoid cavitation damages on highdifferential pressure services such as carbamatepump minimum recirculation flow.Second stage is realized by a lenticular seat built-incage. Drilled cage paths are partialised by the specialdesigned upper portion of valve plug in order to realizethe most suitable expansion coefficient for any valveopening.1-4827 SERIES VALVE WITH 1-X-212 PNEUMATICDIAPHRAGM ACTUATOR AND COMPLETE WITHCOMPANION FLANGES (OPTIONAL)ACA 0255 - 10/08SPECIALTY CONTROL VALVES FOR UREA PLANTS- 6 -