BULL PLUG

Convex head plug (also known as head, pipe cap, or blind head): a pipe fitting used to permanently or temporarily seal pipeline ports, achieving sealing through welding or threaded connections to prevent medium leakage.
Core function: Replace traditional pipe plugs and install directly on the pipe end without the need for additional connectors, simplifying the pipeline system.
Structure type and characteristics
Convex plugs are divided into four categories based on their geometric shape, and their performance is inversely related to manufacturing difficulty:
Hemispherical head: has the best pressure bearing capacity (uniform stress distribution), but is difficult to form and suitable for high-pressure vessels (such as nuclear power and chemical equipment).
Elliptical head: Excellent comprehensive performance, balancing pressure bearing and manufacturing feasibility, occupying the mainstream market (such as oil pipelines and pressure vessels).
Dish shaped head: composed of a spherical surface and a folded transition structure, it is easy to manufacture but has weaker pressure resistance than an elliptical shape. It is necessary to avoid splicing and thinning areas (where high stress is easily generated at R).
Spherical head: the simplest structure, low cost, suitable for low-pressure scenarios (such as drainage pipes, food equipment)