A quick-opening blind is a mechanical device used on circular openings of pressure pipes or pressure vessels. Typically, it consists of components such as the cylinder flange, head cover, hook or clamp, seal, safety interlock mechanism, opening and closing mechanism, swing arm, and short section (if required).

Quick-opening blank flanges are a type of quick-opening cover for pressure vessels, widely used on equipment in the natural gas field that requires frequent opening and closing. Common quick-opening blank flanges are categorized into typical structures such as tooth-type, clamp-type, plug-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 Section VIII Division 1, with finite element stress analysis and structural design. All major pressure components are manufactured from integral forgings using 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 flange fully complies with regulations such as GB150 and adheres to the industry standard SY/T0556-2018 (Technical Specification for Quick-Opening Blind Flanges).

Application Scenario

Oil and natural gas transmission pipelines

Cleaner receiver and sender cylinders (also known as: ball receiver and sender cylinder)

Various filters and filter separators

Pressure Vessel, Sulfurizing Pot