We should select corrosion resistance, reasonable
structure, good sealing performance, easy operation and easy maintenance
of the gas valve.
There are three main options: gate
valve, ball valve and butterfly valve.
Gate valves are through move wedge up and down to open and close,
suitable for pipeline depth deeper situation.
Ball valves are through rotate ball to open and close, can not
easily be medium erosion. They are simple structure, easy maintenance,
full-diameter design and small flow resistance.
Butterfly valves are designed according to principle of tube block
disc. They are simple structure, light weight, easy to operate,
but the flow resistance is large and clean ball and pipe detectors
can't pass.
Comparison of economic, the cost of gate valves and butterfly
valves are similar, but from many years of using the outcome,
gate valves performance and life is far superior to butterfly
valves.
Comparison of safety, gate valves are fire-resistant, high temperature,
corrosion-resistant characteristics, with a completely closed
open and close indicator, so that the operator could clear understanding
the state in which the valves.
Ball valves are also fire-resistant, high temperature, anti-static
characteristics, with block to lock body with limited spaces,
to prevent operator misuse or illegal operation.
Butterfly valves are too narrow seal width to affect the seal,
easily damaged when fire and high temperature, short using life.
In a word, butterfly valves are not very applicable to buried
gas pipeline. But due to the constraints space, only selected
butterfly.
From the structure and safety features, gate
valves and ball
valves are suitable for underground gas pipeline. But ball
valves are high cost, gate valves are long time to open and close.
So, based on ensuring safe, we should reduce costs as far as possible,
make the best selection according to the gas properties and pipeline
pressure.
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