Before the application of the slab gate valve, the gas valve experienced the application of the single gate wedge type water gate valve and the oil seal plug valve. The effect was not satisfactory. Therefore, the parallel double gate valve was designed and successfully applied.
Gas valves occupy an important position in the gas industry. The Ministry of Construction attaches great importance to the normative construction of gas valves. The industry standard for gas valves is CJ3005-1992 "General Technical Requirements for Gray Cast Iron Valves for Town Gases", CJ3055-1995 "Test and inspection of valves for gas use", CJ3056--1995 "General technical conditions for valves made of ductile iron and cast steel for town gas", and in June 2002 passed the industry standard for "manual manual gas valve for household use". The formulation and promulgation of these standards have regulated the valve industry, promoted the progress and development of gas valves, and promoted the development of the gas industry; provided reference for development, production, and use of units; improved understanding of the difference between gas valves and general valves The safety margin of the gas valve is guaranteed; it is welcomed by the gas counterparts.
In the 1980s, China's gas was mainly made of artificial coal. The artificial coal produced gas contained more impurities and “gas glueâ€. The traditional single-gate wedge type sluice valve was increasingly unable to adapt to gas conditions. The need for such valves is generally "closed" and stem stems, so the gas-sealed plug valve was developed, which solved the problem of tight gate valve and stem sticking.
With the development of the gas industry and the establishment of gas plants, gas-specific valves with large or even large nominal diameters are required. The parallel double-gate gate valves for gas are used to solve the problem of artificial gas formation. The maximum diameter is 1600mm.
1. The parallel double gate valve can scrape off the “gas glue†on the sealing surface during the opening and closing process, which solves the big problem that the gas impurities adhere to the sealing surface and affect the valve sealing;
2, equipped with a valve stem protective cover, so that the valve stem is not eroded by "gas glue";
3. The lower part of the valve has a drain hole side cover, which can clean the garbage falling at the bottom of the valve cavity;
4, the full diameter design of the flow resistance is small, but also through the pig;
5. The valve body adopts the specially designed “squirrel cage frame rib†to reduce the overall weight of the valve and enhance the strength and rigidity of the casing;
6. The gas gate valve housing is made of gray cast iron and the price is low;
7. The slab gate valve has a fully enclosed opening and closing indicator to enable the operator to clearly understand the state of the valve.
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