I have created new field "Facility_Type" to the existing feature class and applied coded value domain. but during editing domain value is not populating.
You can refer the attached screen shot.
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you have set the domain of the field at table level. You are using subtype with your table and you must set domain at subtype level.
Follow this path:
Right click your FeatureClass (PW_Facilities) in ArcCatalog > Subtypes Tab > Select Pump Station subtype > set facility_type field domain to FacilityType.