Transportation machinery and butterfly valve

Gate (VA G-EKO valve is closed parts (ram) along the channel axis perpendicular to the direction of moving the valve, pipe cutting medium used primarily as a road, that is fully

open or fully closed to use. General, not be used as adjustable flow valve use. High pressure can also be used in combination suitable for high temperature

Low and according to material differences between the valve gate but not generally used for drag chain conveyor mud and other media pipeline.
Strengths:
① fluid resistance is small;
② opening and closing torque required is small;
③ can be used in a medium flowing in the direction to the two rings on the road network, that the medium flows unrestricted;
④ fully open, the sealing surface by the working medium erosion than globe valves;
⑤ body structure is more complex, the production process is better;
⑥ relatively short length of the structure.
Defects:
① larger dimensions and opening height, the required installation space is also large;
② In the opening and closing process, the sealing surface were relatively friction, wear large, resulting in high temperatures likely to cause abrasions;
③ generally has two valve sealing surface, to processing, polishing and maintenance of some difficulties;
④ open and close for a long time.
Butterfly (VA G-INTEREX VA G-EKN Butterfly is the  roller chain conveyor reciprocating rotary disc hoist about 90 ° to open, adjust the fluid channel blockade and a valve.
Strengths:
① simple structure, small size, light weight, supplies Province, particularly for large diameter valves;
② open and close rapidly, flow resistance coefficient;
③ can be used with the suspended solid particles of the medium, based on the strength of the sealing surface can also be used in powder and granular media. Suitable for

ventilation and dust piping bidirectional hoist and regulation throughout used in metallurgy, light industry, electricity, kerosene, gas pipelines and chemical fractions of

waterways.


Defects:
① flow adjustment range of small, up to 30% when open, the flow will carry more than 95%.
② As the butterfly structure and sealing material limits, not for low-temperature, low-pressure piping systems. General Task temperature below 300 ℃, PN40 6 40 less.
③ sealing performance relative to the valve, Stop Valves poor, so not very high requirements for sealing the center.