Tank Sight Glass type 120-V | Noris

Noris Type 120-V – Vacuum Sealing with O-ring

The Noris Bauform 120-V is a specialized variant of the circular sight glass Bauform 120, equipped with O-ring sealing for vacuum operation. The primary function as a visual inspection device remains unchanged; the modification concerns the sealing system, enabling operation under negative pressure (vacuum).

Technical Basis

• Base Series: Noris Bauform 120
• Sealing: O-ring designed for vacuum service
• Flange Dimensions Standard: DIN 28120
• O-ring Compatibility: Bauform 120, Bauform 121, and sight flow indicators Bauform 880–887
• Availability: All diameters, nominal pressures, and materials as per the base series

Materials and Pressure Ratings

Bauform 120 series is available in materials such as 1.0038, 1.0425, 1.0460, 1.4541, and 1.4571, with nominal pressure options PN 10 or PN 16. The final specification for Type 120-V must match the DN, pressure, temperature, and material of the corresponding Type 120 assembly.

Typical Applications

• Vacuum tanks or vessels with alternating pressure/vacuum cycles
• Mixing vessels with suction or venting requirements
• Inspection points where air ingress must be prevented
• Chemical, food, process liquids, and auxiliary vacuum vessels

Selection Criteria

Type 120-V is selected when standard flat sealing is insufficient for vacuum conditions. Prior to ordering, verify O-ring compatibility with process media, operating temperature, CIP cleaning agents, design pressure, and body material.

FAQ

Is this a completely different sight glass from Type 120?
No. It is a Bauform 120 variant with O-ring sealing for vacuum applications.

Is an actuator required?
No. This is a static visual inspection component.

What is checked during maintenance?
O-ring, glass, bolts, sealing surfaces, and signs of air ingress or leakage at the seal.