PQ340F double eccentric valve double eccentric hemisphere hemisphere hemisphere ball valve double eccentric overview of the use of eccentric body, eccentric ball and seat, rotary motion stem when the common trajectory of self-centering, the closing process more and more tightly shut completely to achieve a good seal the purpose. Valve ball and seat completely out, eliminating seal wear, to overcome the traditional ball valve seat and the sealing surface of the sphere is always the problem of wear and tear, non-metallic elastic material is embedded in a metal holder, seat metal surfaces are well protected. This product is especially suitable for steel, aluminum, fiber, tiny solid particles, pulp, coal ash, LPG and other media. Double eccentric hemisphere Ball Features 1, the structure of eccentric deed tight tight principle reached by the gate drive mechanism, adjust Close purpose, Sealing ring metal surfaces in contact with a hard surface sealing, double eccentric structure located in the open spool possession of the ball-room, large flow cross-section, and the valve will not be washed, not be washed off the spool, turned Spherical valve spool along a progressive and effective removal of scaling obstacles and achieve a reliable seal. It is easy to scale the two mixed flow conveying solid precipitated mixed 2 is particularly effective, bimetallic valve dome, on a base material of different surfacing alloys by welding the valve seat with a corresponding special processing, the sealing surfaces are combined into preservative , various types of wear-resistant, high strength, etc., to meet the needs of three different occasions, sealed tight, transporting harmful gases reach zero leakage 4, Sealing left spool compensation amount, when the valve do wear after a little time off and then rotate , either can be reliably sealed, extended service life. In addition, users will tighten the compression nut off, adjust or replace the seat post is still available, avoiding the valve seal failure, the entire scrap drawbacks due to the optional bi-metal seal surfacing vice different alloys (or a combination of ball) can be used in wear resistance, corrosion resistance, high temperature and demanding a sealed condition, general valves: Specification DN40-1600. Suitable for wastewater treatment, pulp, urban heating heating requirements stringency two occasions, oil and petrochemical special valves: Specification DN40-1600. Applies to crude oil, heavy oil and other oil products, chemical industry, weak corrosion, two mixed flow medium 3, special gas valve: Size DN40-1600. Suitable for gas, natural gas, liquefied petroleum gas delivery control 4, slurry special valves: Specification DN40-1600. Suitable for liquid, solid or liquid transport two mixed flow in chemical reactions or crystallization fouling of industrial pipeline 5, coal ash special valves: Specification DN40-1600. For power plants, hydro or gas pipelines Cleaner control valve double eccentric hemisphere perform standard design: GB12237-89 flange connection: GB / T17241.6-1998, GB / T9115 (steel) structural length: GB12221-89 double Eccentric hemispherical valve main parts Material Name Material Body QT450, WCB, ZG20CrMo, ZG1Cr18Ni9Ti valve shaft 2Cr13,1Cr13 valve alloy nitriding steels, nitrided stainless steel valve seat wear-resistant alloy nitriding steels, nitrided stainless steel, wear-resistant steel bearing aluminum bronze, FZ-1 composite filler PTFE, flexible graphite ball valve double eccentric hemisphere performance parameters Nominal (Mpa) 0.6 1.0 1.6 2.5 4.0 Nominal by (mm) 40-1600 40-1600 40-1200 40- 60040-600 seal test pressure (Mpa) 0.66 1.1 1.76 2.75 4.4 Shell test pressure (Mpa) 0.9 1.5 2.4 3.75 6.0 Temperature (℃) -29 ~ 300, -29 ~ 425, -29 ~ 540 Applicable medium water, water, sewage, acid and alkali liquid, slurry, steam, gas, oil-driven approach manual, electric, pneumatic connection type flanged connections for installation Vertical installation clip, horizontal installation