12. Back pressure flap is larger and toxic flammable vessel or piping system common use markings pipe valve. 1. Liquids such as water can not be compressed medium common with micro and safety valve closed, or use the safety relief valve. 13. Negative pressure or negative pressure operation is likely to be in the process of initiation system with vacuum negative pressure relief valve. Relief valve discharge is the main parameter, the displacement depends on the opening of the calibre of the seat and disc height, by the open height is not the same, is divided into the enlightening the type and micro type two kinds. Lever type relief valve is mainly depends on the utility of the lever and weight strength and office, but because the lever type safety valve size often greatly limit the scope to choose. 4. Closed raise safety valve used in high pressure water supply ordinary, such as high pressure feed water heater, heat exchanger, etc. The following general rules for safety valve selection. Tiny qi type refers to the opening height of the disc seat throat diameter of 1/40 ~ l / 20. Vote by the operating pressure of the relief Industrial Valves nominal pressure, by using the temperature range of the temperature on the relief valve operation, calculated by the relief valve spring constant pressure value of the voting or leverage constant pressure range, and then on the basis of the media on the relief valve material and structure, and then on the basis of the relief valve discharge volume to calculate the throat area of the relief Industrial Valves. 7. Large diameter, large displacement and high pressure system common use electric impulse safety valve, such as reduction temperature reduce pressure device, power plant boiler, etc. 5. E ordinary steam boiler with static safety valve. 9. Tank at the top of the ordinary hydraulic safety valve, should be appropriate to use breathing valve. 8. The train transport gas tank lorry, transportation tank, storage tank and so on ordinary with built-in safety valve. All rev type refers to the opening height of the disc seat throat diameter of a quarter. 10. Underground drainage or natural gas pipeline common use pilot operated relief valve. 6. Gas compressibility media such as ordinary with closed all safety valve, such as gas storage, gas pipelines, etc. 11. QiZhan liquefied fuel tank liquid reflux pump export normally used on pipeline safe backflow preventer. 2. Ordinary hot water boiler with micro and safety valve is not closed with the board. Q: relief valve selection method a: relief valve on the market now quantity produced so far have spring safety valve and bar type relief valve two kinds big. Additional and pilot operated relief valve, the impulse safety valve, the static weight type safety valve, safety valve switch, security, decompression valve, etc. 14. Dielectric Marine valve ordinary quality, and the lower the freezing point system to choose warm jacket type safety valve. Spring safety valve mainly depends on the effectiveness of spring strength and office, again in spring safety valve closed and not closed, ordinary inflammable, explosive or toxic mediums should choose close type, steam or inert gas can choose not closed type, such as in the spring safety valve and with handle and without handle. 3. Steam boiler or steam pipes common in not closed with the board and all safety valve. Higher temperature when choosing safety valve with radiator. The handle of the utility is mainly seizing the flexibility of the disc, sometimes also can be used as a manual pressure closely. 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 valve, 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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