ตัวฉีด

Also known as ejector, steam ejector, eductor-jet pump, thermocompressor

thumb|right|350px|Injector typically used in steam locomotives thumb|right|400px|A- Steam from boiler, B- Needle valve, C- Needle valve handle, D- Steam and water combine, E- Water feed, F- Combining cone, G- Delivery nozzle and cone, H- delivery chamber and pipe, K- Check valve, L- Overflow