The HF-4 (threaded) internal thread flame arrester features a reasonable structure, light weight, corrosion resistance, qualified explosion resistance, easy maintenance, and convenient installation. It also meets the fire resistance requirements, showing no backfire phenomenon during a 1-hour fire resistance test. The flame arrester core is made of stainless steel, which is corrosion-resistant and easy to clean. The shell passes the hydraulic test.

The HF-4 (threaded) internal thread flame arrester is suitable for use on pipelines, Class A fuels with a flash point below 28°C, oxygen liquefied gases, and kerosene, diesel, and crude oil with a flash point below 60°C. It can be used on pipelines transporting flammable gases, flare systems, oil and gas recovery systems, heating furnace fuel gas networks, gas purification and purification systems, gas analysis systems, and coal mine gas emission systems.