I. Product Introduction

Impeller Sight Glass, also known as Flow Indicator (Impeller Indicator; Sight Glass; Flow Indicator; Oil Flow Observer; Liquid Flow Display; Flow Observer), is a necessary accessory for observing the flow of media within pipelines.

When the medium in the pipeline passes through the impeller sight glass, it drives the impeller inside the gauge housing to rotate. Observe the rotation of the impeller through the sight window to determine if there is medium flow in the pipeline.

Used for observing the turbidity and flow of liquid and gas mediums. Widely applied in cooling systems, lubrication systems, fuel supply systems, and industrial equipment for oil, chemicals, chemical fibers, food, etc., it allows for real-time observation of the flow and reaction of liquids, gases, and steam, making it an indispensable accessory for normal production.

II. Structural Form

Internal threaded connection	Bolted cover
EU Standard Round Head Caps	DIN hexagonal cap screw

Section 3: Performance Parameters

1. Main Material: Carbon Steel, 304, 304L, 316, 316L

2. Window Material: Tempered Boro-Silicate Glass, High-Boro Silicate Glass, Quartz Glass

3. Blade Material: PP, PTFE

4. Nuts and Bolts: B7/2H, A2-70, A4-70, etc.

5. Sealing Washers: Nitrile rubber washers, polytetrafluoroethylene washers, high-temperature four-fluoride washers, metal washers, graphite washers.

6. Sealing Surfaces: Bulb face (RF), Flat face (FF), Male/female face (MFM), Tongue and groove (TG)

7. Connection Types: Flange Connection, Internal Thread Connection, External Thread Connection, Welding Connection, Clamp Connection

8. Flange Standards: HG20592, GB, SH, HGl, JB, ANSI, JIS

9. Manufacturing and Inspection Standards: HG/T4284-2011

10. Operating Temperature: Carbon Steel: -30℃ to +350℃; Stainless Steel: -80℃ to +480℃

11. Glass Temperature Resistance: Tempered borosilicate glass: ≤280℃; High borosilicate glass: ≤450℃; Quartz glass: ≤850℃; Allowable thermal shock <60℃.

12. Glass Pressure Resistance: Tempered borosilicate glass: ≤3.0 MPa, quartz glass: ≤5.0 MPa.

13. Exterior Paint: Carbon steel: Corrosion-resistant paint; Stainless steel: Pickling or polishing treatment.

Four: Maintenance and Care

1. The impeller sight glass is a device used for observing the flow and reaction of liquid mediums; its viewing window glass should be kept clean and dust-free.

2. Window glass is a fragile part; handle the mirrors with care during installation. The mirror base should be flat and smooth, with the sealing gasket between the glass and the base installed flatly. The gasket should be undamaged and free of grease. Ensure the mirror base and cover are properly aligned before tightening the screws, then tighten diagonally slowly.

3. The impeller assembly may experience hindered shaft rotation due to accumulated impurities from long-term operation, requiring disassembly and cleaning.

4. Glass has certain limitations in terms of temperature and pressure resistance; please strictly follow the instructions on the manual.

5. Allow for rapid temperature changes below 60°C; glass may crack due to excessive temperature differences.