A quick-opening blind is a mechanical device used on circular openings of pressure pipes or pressure vessels. It typically consists of components such as a cylinder flange, head cover, hook or clamp, sealing ring, safety interlock mechanism, opening and closing mechanism, swing arm, and stub (if required).

Quick-opening blank flanges are a type of quick-opening cover for pressure vessels, widely used on equipment that requires frequent opening and closing in the natural gas field. Common quick-opening blank flanges are categorized into typical structures such as tooth-type, clamp-type, bayonet-type, locking ring-type, expanding ring-type, and fixed pressure ring-type, primarily operated manually.

Our quick-opening blind flange is designed according to ASME VIII Div.1, with finite element stress analysis and structure by ANSYS. All main pressure components are machined from integral forgings, utilizing low-alloy high-strength carbon steel.

Corrosion-resistant surfacing process, suitable for various operating conditions, and capable of undergoing hydrogen and sulfur resistance tests.

Our quick-opening blind is fully compliant with regulations such as GB150 and adheres to the industry standard SY/T0556-2018 (Technical Specifications for Quick-Opening Blind Flanges).

Application Scenario

Petroleum and natural gas transmission pipelines

Cleaning Ball Receiver/Discharger (commonly referred to as: Ball Handling Tube)

A variety of filters and filter separators

Pressure Vessel, Sulfurizing Tank