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China Hongyang Group, is an integrated enterprise with the research & development, production and marketing of Fuel Dispenser and related accessories as well as service station concerning equipments. It concentrates on the relative manufacture & services of filling station such as Hongyang tax control Fuel dispenser, IC Card fuel dispenser, manage system of network for stations, submerge pump and liquid level devise. China Hongyang Group, designed supplier of SinoPec and PetrolChina, our HONGYANG products have been sold to over 50 countries in South-east Asia, Mid-east, Africa, Europe and well received in their markets.

used to keep a certain fuel dispenser position to refuel. Working principal Pressured oil flow into the chambers in where main and vice valve located after switching main valve and flow out of spout because vice valve is opened. Liquid flowage reduces the static pressure and the pressure in upper chamber of switch. The pressure on the chambers of upper and low switch membrane are equivalent due to the front of spout communicating atmosphere. When inlet vent is flooded by oil, the lower chamber of switch membrane still keeps atmospheric pressure. Thus, pressure difference is generated between the upper and lower chambers of switch membrane, the membrane and auto-shut level moving upward, auto controlled level moves downward under the function of switch handle. F fuel dispenser inally, steel ball is drive fuel dispenser n into the hole of auto controlled level; switch handle continues to move downward; main valve is closed. In order to form the auto-shut function, two oil passages with different sections should be set (See Diagram 2-32). Here the Bernoulli equation as followed in order to explain the principle of auto-shut: �? = 12 ρv12+ρgh1=�?+12ρv22+ρgh2 (2--6) Among the above formula: ρ── oil density �?── pressure in main valve passage v1 ── velocity of flow in main valve passage h1── height of main valve �?── pressure in vice valve v2── velocity of flow in vice valve passage h2── height of vice valve Diagram 2-32: Auto-shut nozzle Due to small nozzle body, it could be regarded as a horizontal pipe, that is h1= h2 From Formula 2-6: �?－ｐ2�?2ρ(v22－v12) (2-7) According the following Formula: v1v2=A2 A1 In the Formula: A1 ── section of main valve passage A2 ── section of vice valve passage The Formula can be converted into: �?－ｐ2�?2ρv22 [1�?A2A1)] It is known from Formula 2-8 that if A2 / A1 is certain value, P2 becomes a negative value when velocity of flow increasing a certain extent, that is, P2 smaller than at

fuel dispenser alization process which can no longer be　　agement system of the instrument manufac-　　 stopped. In the last few years the PTB has　　turers in view of special technical aspects in　　 significantly intensified its activities in this　　explosion-protected equipment as well as　　 respect in close agreement with the German　　regular manufacturer surveillance. The certifi-　　 standardization organizations and industrial　　cation procedure is completely compatible　　 associat fuel dispenser ions to further improve the fuel dispenser position of　　with the ATEX procedure of EU Directive　　 German enterprises in international competi-　　949EC. Both equipment owners and na-　　 tion.　　tional regulating authorities can now make　　use of a most comprehensive and internation-　　ally available surveillance tool.　　 Figure 5: Flame ar-　　 rester (strip winding).　　 Such strip windings are　　 mainly used as flame-　　 extinguishing elements　　 in static flame arrest-　　 ers.　　 79　　Thermodynamics and Explosion Protection　　Cooperation wit

s ever done�? But, Mr K fuel dispenser ushner adds “They went away with something else, this voice of Brecht s secular, cynical, wise, but which also connected with their humanity.�? In Britain, English Touring Theatre s production of “Mother Courage�?opened on October 5th; and at the Royal National Theatre “The Life of Galileo�? Brecht s study of the scientist whose discoveries shook Christianity, has been one of the hits of the late summer. Directed by Howard Davies in a translation by Sir David Hare, this Galileo is one for our time engaging, accessible, full of quarrels about secularism and the rigidities of faith. Simon Russell Beale as Galileo is a cigarette-smoking, whisky-swigging intellectual who would not be out of place in a red-brick science fuel dispenser faculty. The revolving set fuel dispenser , with its stylish cupola and planetary holograms, could be part of the CERN particle physics laboratory. Mr Davies acknowledges that the playwright is still a challenge for British audiences “‘Galileo is a risky proposition. Political theatre in Britain since the late 1970s has taken a dip, and Brecht was always perceived as political. But, in a big way, it s timely to revive him. ‘Galileo describes a schism over interpreting the world how could anything be more relevant? Considering the Middle East and the issues that have arisen from that, I think the play has if anything increased its currency.�? But don t Brecht s own ideas inevitably inhibit today s directors? “Once, those theories were vital for a strike against bourgeois theatre. That s their context. Now, they re scaffolding and don t have to be shown,�?argues Mr Davies. The production s 21st-century dress is complemented by Sir David s brisk script. A dense scholasticism and clunky, scene-setting rhymes have been replaced by an urbane English demotic that is plain and unadorned. Sir David, too, believes that Brecht remains modern “After the fall of the Berlin Wall in 1989, communism was seen to have failed. That seemed to render B