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supply ball valves flanged steel from China cheap

Offer type: salePublished: 20.11.2014
Ball valve
Ball valve - a valve, or a locking control element which has a spherical shape.
This is one of the most modern and progressive types of valves, regulating element which is movable item shutter having a spherical shape, with a hole for passage of a flow of the working fluid and to close it.
The design of ball valves is not new and has been known for over 100 years, but in earlier versions it did not provide a dense covering the passage of the medium from the difficulty of enforcing the metal surfaces of ball caps and saddles of the housing. The emergence and implementation in the valve materials such as Teflon, synthetic rubber for the manufacture of saddles led to the beginning of widespread use of ball valves. New materials enabled the closure density, and significantly reduce the effort required to control the crane.
A movable element (gate) of such cranes is a spherical cap - ball, the axis of which is a round through hole for passage of the medium. In the walk-through valves to fully close or open the passage enough to turn the ball 90 degrees. The diameter of the hole usually corresponds to the inner diameter of the pipeline, which is installed on the crane, called in this case, full bore. Hydraulic losses during the passage of the working medium through the fully open valve is very small, almost the same as when the passage of the medium through the pipe equal to the length of the valve body, which is much less than in other types of valves. This is a valuable quality made ball valve main shut-off device on the linear parts of main gas pipelines. However, to reduce the size and torque required to operate the valve, sometimes used narrowed valves.
In addition to the above ball valves have a number of other advantages, including:
the simplicity of the design;
high and reliable sealing;
small dimensions;
a simple form of flow and the absence of the stagnant zones;
convenient operation;
a little time spent on the turn;
the applicability of the viscous and contaminated media, suspensions, slurries and sludges.
As a drawback is the need for a "dead zone to rotate the crane with cantilever handle. This disadvantage can be compensated valve with handle-lamb.
The saddle to hold the body in the form of rings of different types of plastics (mainly PTFE), which provides reliable sealing, ease and smoothness of rotation of ball caps, but limit the use of such cranes for environments with temperatures no higher than 200 °C.
Ball valves are controlled manually (for small diameters), and using a mechanized actuator - electric, pneumatic and hydraulic, and valves for gas pipelines is possible to use as the management environment of the actuator environment, transported by pipeline. In everyday life the ball valve can be called greenyellow.
These products can be used in systems of varying complexity:
in pipelines for transporting water - hot and cold;
in the motion systems of oil and gas;
in a city gas supply system;
as control valves.