I. Product Overview
HG21619-21620 Standard Pressure Vessel Sight Glasses, also known as Equipment Sight Glasses, include Flat Flange Sight Glasses and Flat Necked Sight Glasses. Available in sizes DN50-DN150, non-standard bore sizes can also be customized. Materials include stainless steel and carbon steel. Suitable for observation devices on industrial equipment such as dairy, oil, beer, beverages, chemicals, water conservancy, electricity, and others, to monitor internal material operations.
The main use of sight glasses: These glasses are used in industrial production facilities such as oil, chemical, fiber, and food industries to observe the flow and reaction of liquids, gases, steam, etc. at any time, and are an indispensable accessory for ensuring normal production.
Section II: Structural Configuration

Section 3: Installation Precautions
1. On-site installation requires disassembling the sight glass, protecting the glass and gaskets to prevent damage.
2. After welding the ends or joints, assemble carefully, and ensure that fasteners are tightened evenly and symmetrically to prevent glass damage.
3. Upon discovering any damage to the glass and gaskets, they should be replaced immediately.






























