First, the product summary

The top-loading eccentric hemisphere valve is a new product developed successfully by absorbing and digesting the advanced technology both at home and abroad. It is also an innovative product that fills up gaps in the domestic valve variety. It is the premise of carefully weighing the advantages and disadvantages of ordinary valves, butterfly valves and gate valves . This series of ball valve is the crystallization of the traditional ball valve rich spiritual change; it is the metal ball crown fixed on the eccentric ball, through the eccentric crankshaft rotation of 90 degrees to achieve the valve opening and closing, and the metal ball sealing surface contact with the metal seat in the Axial and radial float to compensate for the ball and valve seat with the valve. The simple and reliable structure and effective sealing method make it not only can replace the gate valve, but also can be used in the system which can not be used. It can be widely used in petroleum, chemical, power and metallurgy industries. Its core technology is the first in China, and it has unique design and novel structure. Valve structure using eccentric tight principle, through the transmission mechanism to achieve the purpose of tightness, regulation, shut down, the seal ring and the ball are metal surface ring with hard-surface contact seal, double eccentric structure when the ball is hidden in the valve cavity , Large circulation surface, and the valve is not washed, no flow resistance. When closed, the valve core is not washed away. When the valve core is closed, the spherical surface of the valve core gradually advances along the valve seat. With the cutting function, the fouling barrier can be effectively removed and a reliable seal can be achieved. It is particularly effective on media that is prone to fouling. The valve hemisphere is fixed to the metal ball on the eccentric ball, ball on the sphere of different alloys, the valve seat is also the corresponding surfacing alloy, the special treatment, the sealing surface into anti-corrosion, wear resistance, high temperature and so on Types, to meet the needs of different occasions. Valve seat and bead left a compensation amount, when the seat wear, turn off a little while turning, still can be reliably sealed to extend the service life. The greatest feature of this valve is that after the pressure relief device in the working condition system, the valve can be inspected and repaired online, the valve cover can be lifted out of the spherical cap and supporting body without having to remove the whole valve from the pipeline.

Second, the scope of application

 1, suitable for water, raw water (including sand), sewage, sea water, steam, oil, alumina, urban heating and other demanding systems. 
 2, soft seal eccentric hemisphere valve temperature -40 ℃ ~ 135 ℃, and hard seal eccentric hemisphere valve temperature is normal temperature to about 600 ℃. 
 3, for the bottom of the dam vent valve and control valve (high flow state). Pulverized coal ash, for liquid, solid two phase mixed flow or liquid transport in the chemical reaction of crystallization or scaling of industrial pipelines. Product Structure Features According to customer requirements of the media, the temperature requirements are different, the crown with chrome molybdenum, vanadium alloy, valve seat welding chromium, molybdenum alloy, chrome, stainless steel alloy to meet the needs of different slurry delivery. 
 4, for the traditional pump delivery valve, such as pressurized system, central air conditioning system. 
 5, can be configured as a safety valve flow control valve, squib valves, valves and so on. 
 6, suitable for tap water systems, gas systems, natural gas systems and other underground pipelines (height is small).

Third, the product features
 1, the pressure loss is small: fully open water loss is zero, the flow path completely smooth; lumen automatic cleaning, spool rotation of 90 degrees, automatic flushing valve body cavity, the media debris clean and medium Will not be deposited in the valve cavity. The sphere is hemispherical and has the highest Cv value for circulation, enhancing pump system efficiency and minimizing abrasion. 
 2, resistant to particle wear: the principle of the use of double eccentricity in the closing process, only at the last moment the ball crown relies on the seat, without friction; and the seal seat surfacing wear resistant self-lubricating alloy, easy to wear, Not easy to be washed; knife-shaped ball mouth between the crown and the seat with a wipe clean and shear effect, easy scaling. 
 3, automatic compensation seal reliable: positive pressure, the use of eccentric principle, the ball and valve seat more close the more tight, so as to get a good seal; Back pressure, the floating seat under pressure, the valve seat automatically to the ball Tighten, the higher the pressure, the valve seat to push the ball more tight, so as to get a good seal; can maintain a lasting tight seal, to adapt to harsh working conditions. Under the long-term use, if the valve seat seal is worn or damaged, the valve seat will automatically push to the sphere under the action of a spring, so as to obtain a good automatic compensation function. 
 4, suitable for high-flow medium: due to the sphere hidden in one side of the valve cavity to form a straight flow channel without flow resistance, solid eccentric fixed crankshaft, high-velocity medium without vibration, no noise. 
 5, long life switch easy: no wearing parts, due to the role of eccentric valve opening and closing during the ball and the valve seat sealing surface completely out of the seat surface and the spherical cap spherical scratch-free friction-free rotation, effective Reducing the operating torque twist, light operation; automatic valve compensation function, greatly improving the life of the valve. 
 6, easy maintenance: The valve uploading design, the ball and the ball from the top of the valve into the body; overhaul simply open the valve cover hanging out of the ball and the ball can be repaired and sealed rings and other accessories, not the entire The valve is removed from the pipe, which gives great convenience to the underground pipelines, especially the ball valves for atomic energy industry. 
 7, the valve in maintenance operations at the same time, as far as possible to retain the medium in the pipeline, will not result in energy waste; This will remove the user a lot of preliminary support work, so that maintenance becomes more simple.
 8, in some special occasions, during the repair of the valve can not affect the normal operation of the pipeline system, as long as the ball in the package quickly remove the closure of the catchy mouth can immediately resume the pipeline pressure operation, so that the benefits of repairing the valve Losses reduced to a minimum.

 Fourth, dimensions