Zirconia ceramic ball valve characteristics and performance of the ceramic ball valve in addition to the vast majority of the advantages of the metal ball valve, but also has a strong corrosion resistance, high temperature resistance, wear resistance and erosion resistance, etc.. Widely used in petrochemical, metallurgy, paper, power plant, oil refining and other industries of various acid and alkali salt gas, liquid, high temperature steam and mud transport system. Is the strong corrosion situation of titanium metal valve, Monel valve ideal replacement products. Zirconia ceramic ball valve has the advantages of low cost, high economic performance and long life (2 ~ 4 times of the titanium valve). Its driving mode is manual, pneumatic, pneumatic, a spring reset, electric, etc.. And can design all kinds of special ceramic valve according to user's requirements. Erosion resistance, wear resistance: valve ball, valve seat and lining are the use of zirconia ceramic material, the hardness of the Luo's more than HRA87, and thus can withstand high speed fluid and hard particles of the erosion. Excellent wear resistance. Strong corrosion resistance: the Institute of metal corrosion and protection research and testing, except glass solution and hydrofluoric acid, zirconium oxide ceramic material with excellent corrosion resistance. Long service life: through the mechanical part of the Hefei General Institute of static pressure life test, switch ten thousand times still not leak.

Wide application: suitable for all kinds of acid, alkali, salt liquid, gas medium environment, hard sealing valve is especially suitable for the environment with particles, fibrous media. Zirconia valve seat: the structure is simple, its performance is mainly determined by the zirconia material itself, and for the valve seat ring parts, to make full use of the advantages of zirconia ceramic wear resistance, corrosion resistance, but also to avoid the relatively poor toughness of the metal, the structure design has taken three measures:

One is according to the characteristics of ceramic materials with high compressive strength and tensile toughness poor, outside the seat too round profit allocation of special metal ring and metal ring heat expansion coefficient should be close and zirconia ceramic, to make ceramic outer circle is always in the state of compression, produced in the impact of frequent seat ball valve of to pull force can be positive or negative offset, to prevent the seat due to tensile stress and rupture.

Second, according to pumping oil pump of the original metal seat (especially the part of fixed seat) wall thickness thin side of the situation, in does not affect the pump under the premise of quality, increase the wall thickness of the valve seat, such as wins Island petroleum machinery plant supporting the production of 83mm pump fixing seat, the standard size of the wall thickness of the original 11mm, improved to 15mm, greatly enhancing the reliability of the valve seat;

Three is to improve the toughness of the ceramics as much as possible, which is also the success of zirconia ceramic materials used in pump valve ball, valve seat. The actual fracture strength of the ceramic material is much lower than the theoretical value. The brittle fracture theory of Griffith (Griffith) was proposed in 1920, that is, the theory of the gap of brittle materials, the existence of the original crack, the existence of cracks caused by stress concentration, the stress at the tip of the crack is much higher, when the stress at the tip of the crack reaches the theoretical strength, the crack is rapidly expanding. According to this theory, it can be known that the preparation of dense and non porous materials, fine grain size is one of the effective ways to improve the toughness of ceramics.

To this end, we have developed a strict production process standards, to protect the product factory, the valve ball surface and valve seat sealing surface is not allowed to have any cracks and pores exist. By taking the above three measures to avoid the valve ball and valve seat in the use of quality failure, not only increases the reliability of the pump, but also extends the service life.