Equipment and stations for transmission and distribution of fuel gases, namely, two-stage condensate separator filters; condensate separators; filters; indirect heaters; heat exchangers; valves; gas pressure regulators; gas safety shut-off devices; cut-off devices; slam shut devices; pressure vessels; fuel gas cleaning systems; fuel gas odorization systems; equipment and systems for monitoring and separating used at the oil well heads, namely, gas liquid separators, valves