Brass Butterfly Valve

Usmani Valves Co. Pvt Ltd ( UTVC Make) Butterfly Valves generally conform to BS 5155 (BSEN 593) /IS 13095 / AWWA C504 standards for dimensions, materials of construction and constructional features, as per the need of the application. These Butterfly Valves are Quarter Turn, Resilient Seated type with a choice of Single / Double Eccentricity of Disc, different type of operators and accessories and have proven performance. The disc is mounted on a pair of stub shafts supported in self-lubricated bronze bearings housed in bearing housing integral with the valve body. The drive to disc is affected by the drive shaft which is connected to the valve operator by Keys and to the disc by Shear pins / Keys. Both DE and NDE shafts are provided with special sealing arrangement. Body seat ring is fitted in the body. Rubber seal ring is fitted on the periphery of the disc and is clamped in position by a clamping ring. Clamping ring allows setting of seal ring compression to a desired extent by adjustment of setting grub screws and tamper proof hexagonal head screws / hexagonal Socket head cap screws.



The special feature of valve is that the disc is mounted eccentrically in valve body. Due to this the rubber seal on disc does not rub against the body seat ring in crack open position. The shat axis is offset to the sealing plane. The body seat ring is in the form of the frustum of a cone. The disc and the seal are so dimensioned that in fully closed position the disc seal comes in the contact with the body seat ring, thus giving drop tight shut off in both flow direction. The salient features of these valves are as follows: