Weld-On Sight Windows for ASME Pressure Vessels
and non-ASME Applications

Jacoby-Tarbox Pressure Vessel Quality (PVQ) windows, circular and obround, are available manufactured in accordance with Section VIII of the ASME Boiler and Pressure Vessel Code.  Weld pads are a proprietary size and designed to be self-reinforcing like any other studding outlet.  Factory thicknesses work for most applications.  Custom thicknesses are available to meet your vessel designer’s requirements.  Non-ASME windows are available for lighter duty and piping applications.


• Pads available with flat (standard), cylindrical radius cut, or spherical radius cuts
• Weld neck body windows available for pipe ends, fittings, or vessels
• Standard windows available to 600 psig / 41.4 bar (consult factory for higher pressures)
• UniGlas window discs available for all weld-on sight windows
• Standard windows available with quartz glass for service temperatures up to 2012°F / 1100°C
• Custom sizes are available
• Weld pad material available to match your specification


Tel: +1 (440) 572-1500


A History of Innovation

Clark-Reliance® provides customer solutions in over 120 countries in the power generation, refining, gas processing and chemical industries. Key acquisitions over the last few decades have solidified Clark-Reliance as an industry leader in the design, manufacture and distribution of level indication & control and filtration & separation products and services.

Clark-Reliance® has a long and rich history that abounds with innovation. Consistently on the forefront of technological progress, Clark-Reliance is a multidivisional corporation that designs and produces award-winning products.

Copyright © 2021 Clark-Reliance Corporation. All Rights Reserved.

16633 Foltz Parkway Strongsville, OH 44149