281.491.2331 13839 West Bellfort Street Sugar Land, TX
281.491.2331 13839 West Bellfort Street Sugar Land, TX
Certified
ISO 9001:2015
U.S. Patents
90 + U.S. Patents
Experts
Since 1954
Get A Quote

SG

Where to Use

  • Chemical Injection: Upstream of injection probes or downstream of injection pumps
  • Gas or Liquid Applications: Downstream of sample probes or pumps

Peek in on Your Process

When trusting the process isn’t enough, get your eyes on it. With a Welker SG Sight Glass in the line, technicians can visually observe fluid flow on site to ensure sampling and injection systems are functioning properly.

Data SheetSG Data Sheet
IOMSG-3: IOM-172
IOMSG-4: IOM-094
SG-3
Show and Tell

Optional Flow Indicator

For gas or liquid sampling applications where positive flow is less obvious, an indicator improves visibility. The indicator—visible through the viewing window—moves as product flows through the Sight Glass. With three styles, Welker has a flow indicator suitable for your application and flow rate.

Tough as Nails

Corrosion Resistant Material

Our Sight Glasses are manufactured using durable materials that stay strong in the presence of corrosive elements.

Surface Treatment
It's What's On the Inside That Counts

Optional Surface Treatment

Sour gas application? Treating the wetted surfaces of your Sight Glass with Sulfinert® protects against sulfur absorption and corrosion.

Specifications

SG Sight Glass
 SG-3SG-4
ApplicationStandard: Visual Verification of Liquid Chemical Injection
With Visual Flow Indicator: Visual Verification of Liquid or Gas Product Flow
Standard: Visual Verification of Liquid Chemical Injection
With Visual Flow Indicator: Visual Verification of Liquid or Gas Product Flow
Materials of ConstructionCarbon Steel, Plexiglas®, Viton®, and Tempered Glass

Floating Indicator: Nylon
Spinner Indicator: PCTFE and Teflon®

Others Available
316/316L Stainless Steel, Plexiglas®, Viton®, and Tempered Glass

Spinner Indicator: Delrin®

Others Available
Connections1/4" FNPT (Standard)
3/8" FNPT
1/2" FNPT
Weight3.5 lb2.5 lb
Dimensions (L x W x H)2.25" x 2.25" x 4.5" 2.5" x 2.5" x 3.75"
OptionsVisual Flow Indicator (Spacer Type or Spinner Type)High Flow
CE ComplianceVisual Flow Indicator (Spinner Wheel)
Sulfinert®-Treated Wetted Parts
CE Compliance
Operating Pressure2000 psig @ -20 °F to 100 °F