Follow this principle, as long as the temperature of combustion phenomenon things fall below the ignition point, can block the flame spread. 1, utility demand by burning phenomenon of thermal conductivity is one of the indispensable conditions to achieve a certain temperature, gas rendezvous is burning. Because of this, under certain conditions ( 0. 1 MPa, 20℃) Just can make the flame extinguished channel size is defined as 'the maximum experimental safe gap' ( MESG、最大试验安全间隙) 。 Up to now the international often sees fit and use two kinds of method. When the flame was carved up small to a certain degree, calories can be removed by the channel will fall below fuel ignition temperature, that flame is extinguished. 。 When the combustion phenomena of combustible gas as you go through the narrow opening fire element, free radicals and increase the collision probability of channel walls, join the reaction of free radicals. Preset flame arrester inner fire element, are all possible expansion of tiny flame and channel wall contact plane or the size of the object surface, strengthen heat conduction and make the flame temperature below the ignition point, thus blocking the flame spread. Q: principle of flame arrester office answer: about the office principle of flame arrester, up to now there are two main views: one is based on the utility of thermal conductivity; One is based on the wall effect. The channel size of the fire element is the key factor that vote on the properties of flame arrester, different gas has different MESG values. 3, maximum experimental safe gap - MESG fire after a fire element tiny channels and lowering the temperature in the channel. In particular when choosing, and on the basis of MESG value will distinguish for gas. One is the national electric association ( NEC) Taxonomy, it based on gas MESG value gas can be divided into four levels ( A ,B ,C ,D) ; Another kind is the international electrotechnical association ( IEC) Gas, and it also divided into four levels ( IIC, IIB, type IIA and I) 。 2, the wall effect of combustion and explosion are not direct reaction between molecules, but by external can + 羭 wisp of excitation, molecular bonds were mutilate, initiation remaining molecules, the activation molecule and fixed number of year of the division for the survival of the short but very active free radicals, free radicals collide with other molecules, generate new products, as well as initiation new free radicals then with other molecules in response. Because of this, when choosing flame arrester, should according to confirm its MESG value of combustible gas composition. Or by the wall effect, when the narrow channel to a certain degree, free radicals and pipeline wall collision dominated, quantity of free radicals, burning phenomenon can't response then. When the flame through the fire element of many tiny channels after this will be how many tiny flame. Below the ignition point, burning phenomenon will be resting. When the flame arrester narrow channel to a certain extent, free radicals and the channel wall collision dominated, because the number of free radicals rapid loss, response may not be Marine valve, then is burning phenomenon can't response after flame arrester and widely spread. Notes to the order: The national standard) A, A: B: product name, model, nominal size medium and temperature, pressure range C: whether there is attachment, delivery time, and special requirements so that we can correct selection for you. Second, if the valve has been selected by design unit of our company model, please order according to the valves parameters directly with our sales center. Three, it is very important when you use the occasion or the environment is more complex, would you please provide design drawings and detailed parameters, our engineers experts will concentrate on review and analysis for you. We can provide you with professional solutions, including design, customization, complete, operation and service. We've been working on the valve leader in the field of industry, to provide you with the latest knowledge of the valve, the best service, best technical adviser. Thank you for visiting our website, if you have any questions, you can call us, we will be dedicated to provide you with quality services. The factory provides professional ball valve, butterfly Industrial Valves, gate valve, globe valve, check valve, relief valve, safety valve, Marine valve, oil valve, hydraulic control valve and other kinds of valves.
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