安全阀说明书

1、Knowledge of safety relief valves introducedSafety relief valve is a safe and protected with a valve, opening and closing parts of its external force is normally closed by the state, when the device or media pressure inside the tubes increases, exceeds the value of open automaticallyEmissions throug

2、h the media outside the system to prevent the medium pressure piping or equipment exceeds the value, safety relief valves are automatic valves, mainly used for boilers, pressure vessels and piping,Control pressure does not exceed the value of personal safety and equipment operation play an important

3、 protective role.   Safety relief valve by valve opening height can be divided into inching safety relief valve and the entire Kai safety relief valves, safety relief valve inching height of the opening stroke, 0.05d0 (throat diameter minimum emissions );Kai-type safety relief valves

4、full opening height is 0.25d0 (minimum emissions throat diameter).Safety relief valve according to the structure form of points to be divided into vertical hammer, lever, spring-type and (pulse), body structure according to points, can be divided into closed and not closed two,Safety relief valve th

5、at is closed to exclude the media is not compromised, all along the exit discharge to designated location, usually used in the toxic and corrosive media, for the safety of air and steam pressure relief valve,To use more safety relief valve is not closed, the safety relief valve products for the sele

6、ction of the actual sealing pressure should be determined. For the spring-loaded safety relief valve, in a nominal pressure (PN) within theWorking pressure level has several springs, except as noted when ordering safety relief valve type, name, medium and temperature, there should specify the pressu

7、re valve seal, or by the maximum sealing pressure supply.Safety relief valve installation and maintenance should note the following, a variety of safety relief valve should be installed vertically, the safety relief valve outlet should be no resistance, to avoid the phenomenon of pressure, safety re

8、lief valve should be specifically tested before installation and check its official seal, the use of the safety relief valve should be checked regularly.First, knowledge of safety relief valves overviewSafety relief valve is boilers, pressure vessels and other pressure equipment subject to important

9、 safety accessories.Reliability and performance of its action is directly related to equipment and personal security, and with energy conservation and environmental protection are closely related.Second, the definition of safety relief valves safety relief valve called the broad sense, including rel

10、ief valve, from the rules point of view, directly installed in the steam boiler or pressure vessel onThe necessary conditions must be approved valve technology supervision department, called the safety relief valve on the narrowly defined, other general discharge valve.Safety relief valves and relie

11、f valves in the structure and performance is very similar, both are more than open automatically when the discharge pressure of the internal medium, to ensure plant safety. By the existence of such a nature similar to the dry nature, it is in use,Often confuse the two, In addition, some production f

12、acilities are also provided in the rules which can be used. Therefore, the difference between the two is often overlooked. So also there were many problems.If you want to make a more precise definition, may be in accordance with the "ASME Boiler and Pressure Vessel Code"First articulated i

13、n the definition to understand,1, the safety relief valve (SafetyValve) a static pressure from the valve before the media-driven automatic pressure relief device, characterized by a sudden opening of all open action. For gas or steam applications.2, the relief valve (ReliefValve), also known as a ki

14、nd of relief valve before the media by the static pressure-driven automatic pressure relief device. It opened with the pressure exceeds the growth of power in proportion to open. Mainly used for fluid situations.3, the safety relief valve (SafetReliefValve), also known as pressure safety relief valv

15、e of a media driven by the automatic pressure relief device.Use different according to both valid for the safety relief valve is also valid for the relief valve. Japan, for example, to the safety relief valves and relief valves to less clearly defined,General large-scale energy storage such as a boi

16、ler pressure vessel safety device called the safety relief valve, installed in the pipe or other established facilities in the bleed valve. But under MITI's "thermal technology" of the device an important part of the safety and security,Specify the use of safety relief valves, such as

17、the boiler, superheater, reheater, and so on. In the valve of the lower side with the boilers and turbines phase of the occasion,Relief valve to be installed or safety relief valve. This view, the safety relief valve is more reliable than the relief valve requirements. In addition, from the Japanese

18、 Ministry of Labor's high-pressure gas management rules,Ministry of Transport and Shipping Association rules at all levels, the identification of safety and emissions regulations, we take the guarantee of emissions called safety relief valves,Not guarantee emissions valve called the relief valve

19、. Kai in the country regardless of type or Weiqi collectively referred to as safety relief valve.Third, the safety relief valve selection1, the safety relief valve of the classification, the current mass production of the safety relief valve spring and the rod are two major categories. There are als

20、o impulse-type safety relief valves, safety relief valve, safety valve switch,Safety release valve, the static weight safety relief valve. Spring-loaded safety relief valve spring force and rely mainly on the work of the spring-type safety relief valve in the closed and not closed, generally flammab

21、le,Explosive or toxic media should use closed, steam or inert gas used is not closed, the spring-loaded safety relief valve with a wrench in there and without wrenches.Wrench key is to examine the role of the flexibility of the disc, and sometimes can also be used manually with emergency relief. Lev

22、er-type safety relief valve lever hammer rely mainly on the force and work,However, the safety relief valve lever is often bulky and limit the range of choice. At high temperature safety relief valve with a radiator. The main parameters of the safety relief valve is the displacement,The displacement

23、 depends on the caliber of the valve seat and valve opening height, from the opening height, then divided into Weiqi and all Kai two.Weiqi is the valve opening height for the seat throat diameter of 1 / 40 l/20. All Kai is the valve opening height of seat throat diameter of 1 / 4.2, the selection of

24、 the safety relief valve, operating pressure determined by the nominal pressure safety relief valve, operating temperature determined by the use of safety relief valves temperature rangeSecurity from the calculated value of constant pressure relief valve spring or lever decide the scope of constant

25、pressure, then under the decision to use media materials and the safety relief valve structure type,According to the safety relief valve Discharge calculated safety relief valve throat diameter. The following is the safety relief valve used in the general rule.(L) hot water boilers generally is not

26、closed with a wrench inching safety relief valve.(2) steam boiler or steam pipe generally is not closed with a wrench for type safety relief valve.(3), water and other liquids can not be closed for general use compressed medium inching safety relief valve or safety relief valve.(4) high-pressure wat

27、er supply general use of closed-type safety relief valve, such as high pressure feedwater heater, heat exchanger.(5) gas and other compressible medium for general use of closed-type safety relief valve, such as the gas tank, gas pipelines.(6) E-class steam boilers generally static weight safety reli

28、ef valve.(7) large diameter, large displacement and high pressure systems typically use pulse type safety relief valve, such as temperature and pressure reduction equipment, boiler, and so on.(8) transportation of liquefied gas tanker train car tanker, tanks and other general use built-in safety rel

29、ief valve.(9) tank top general, hydraulic safety relief valve, to be used in conjunction with the breathing valve.(10) underground water or gas pipes for general use safety relief valve.(11) Liquefied petroleum gas station can pump liquid return pipe back to normal with the safety valve.(12) or nega

30、tive pressure during operation may have negative pressure systems generally use vacuum safety relief valve.(13) back pressure and toxic volatile flammable container or piping systems are generally used bellows safety relief valve.(14) medium low freezing point of the system is generally used in ther

31、mal insulation jacket safety relief valve.Mainly consists of the following categories,(1) (API526 Wire Joints safety relief valve) (Wire Joints safety relief valve) based American Standard system.Chemical equipment with safety relief valve connection sizes are generally in accordance with this stand

32、ard, as shown.All of the standard nominal diameter of DN15 DN200 (l / 2 " 8"), nominal pressure of 0.1 2500bar, throat diameter from D-T (9.5 146mm).Comparison of the standard scientific norms, pressure, material, temperature, throat diameter and so overall consideration. Throat diameter d

33、etermined in accordance with specifications, the same throat diameter can have several specifications,On the contrary may be the same size pipe diameter can choose several. Such as 4 "to 6" diameter pipe with L, M, N, P are four to choose from.(2) the greatest impact in the international c

34、ompany based in Germany KER safety relief valve (KDA21W) series.Commonly known as safety relief valves,As shown, the safety relief valve from the main valve and pilot valves, pilot valve operating the main valve is opened and closed. The valve displacement large; from the impact of back pressure;Can

35、 be very close to not leak under pressure to open operation; advantages, such as blowdown. Generally applicable to natural gas pipelines.No current international standards and safety relief valve connection size standards. And this type of valve development, no widely.According to my factory experie

36、nce and available information, the international standards of most manufacturers in accordance with the API design and manufacturing data, such as Germany. Corey Valve Co., Ltd.Anderson Greenwood (AndersonGreenwood & Co.) And so on.4, the throat diameter of the throat diameter calculated accordi

37、ng to the calculation of the general, "Boiler and Pressure Vessel Safety Technical Code" in accordance with APIRP520 refinery pressure relief system design and installation of the first part of the recommended implementation of the method of design "Listed in the formula. The results

38、of these two formulas the same or not materially different.(9) tank top general, hydraulic safety relief valve, to be used in conjunction with the breathing valve.(10) underground water or gas pipelines general safety relief valve with the pilot.(11) Liquefied petroleum gas station can pump liquid r

39、eturn pipe back to normal with the safety valve.(12) or negative pressure during operation may have negative pressure systems generally use vacuum safety relief valve.(13) back pressure and toxic volatile flammable container or piping systems are generally used bellows safety relief valve.(14) mediu

40、m low freezing point of the system is generally used in thermal insulation jacket safety relief valve.Mainly consists of the following categories,(1) API526 "steel flanged safety relief valve" (FlangedSteelSafetyReliefValve)-based American Standard system. Chemical equipment with safety re

41、lief valve connection sizes are generally in accordance with this standard, as shown. All of the standard nominal diameter of DN15 DN200 (l / 2 " 8"), nominal pressure of 0.1 2500bar, throat diameter from D-T (9.5 146mm).Comparison of the standard scientific norms, pressure, material, temperature, throat diameter and so overall consideration. Throat diameter determined in accordance with specifications, the same throat diameter can have several specifications,On the contrary may be the same size pipe diameter can choose several. Such as 4 "to 6" diameter pipe with