What does the sealing surface of the ball valve stand for HF?
HF= hard solder material in valves Q347HF, -16C, welded with CoCr or NiCr alloy.
The sealing surface HF of the ball valve represents the surface hardening treatment.Ball valve (ball valve), standard GB/T21465-2008 "valve terminology" is defined as: "open and close parts (spheres) driven by the stem, and around the axis of the ball valve for rotation of the valve.". Can also be used to regulate and control fluid, strong shear force between the metal seat seal V type ball valve V type ball core and welding hard alloy, especially suitable for containing fibers, small solid particles and other media. Switch and multi way valve in the pipeline not only can flow, and flow diversion, flexible control of the medium, but also to turn off any channel to the other two channels. This kind of valve should be installed horizontally in the pipeline. In accordance with the way to drive the ball valve is divided into: pneumatic ball valve, electric ball valve, manual ball valve.The ball (ball valve) published in 1950s, with the rapid development of science and technology, the continuous improvement of production process and product structure, in a short span of 40 years, has become one of the main valve. In western developed countries, the use of ball valves is increasing year by year.
HF is the abbreviation of two English words: "Hard Face", which means surface hardening. Usually surfacing is made of Tailai alloy (Alloy 6). Other surface hardening methods include hard chromium plating. This method is used more in the ball valve. But hard chromium plating is prone to small cracks, which reduces its corrosion resistance.
