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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.
a passage that connects a topic to one that follows.：
Gas Valve Selection Analysis |
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发表于 2010-3-27 15:48