LLC PKF Antey-Izhevsk is engaged in production valve couple( Ball+Seat) from a stellite, carbide of tungsten, stainless steel according to the standards API, GOST, drawing of the customer. Valve Couple (Ball+Seat) use as spare parts for valve in oil rod pump, in electro centrifugal pump and etc, which used for exctart oil, gaz. In Izhevsk, in 2012 was organize the laboratory for quality check of valve couple(Ball+Seat) and their completion under the customer's requirements. Today, LLC PKF Antey-Izhevsk carries out a full operation cycle of making of valve couple(Ball+Seat) in the ISO standards, API. It allows to provide leakproofness of valvate couple with a vacuum pressure not less than 0, 1 kgfs/cm2 within one minute. Requirements for API: Valve Couple(Ball+Seat) has to provide leakproofness at vacuum pressure of 0, 65 kgfs/cm2 within 10 seconds. The smooth surface allows to reveal small scratches and surface damages which can lead to future corrosion of a ball. It allows to increase of time using of valve couple(Ball+seat). Also, it allows to use the pump's at oil extraction in severe conditions. The department of quality control carries out quality control of products at all production phases. We control quality of each valve couple, and valve couples which only underwent testing are allowed to delivery to our buyers. LLC PKF Antey-Izhevsk uses the modern, hi-tech equipment, some machines were made specially under production of valve couples.