The type of general air compressor safety valve is A28X-16T, copper, and AQ20 and AQ25 of stainless steel. The imported safety valve is the first choice of Italy OR brand. There are four main types of OR safety valves. 1831 series (adjustable, temperature 180); 0485 series (spring micro start, temperature 115 C); 0480 series (spring micro start, temperature resistance 160) and 0490 series.
Model meaning
Example: A28X-16T air compressor safety valve
WF- enterprise code (custom made by each safety valve plant)
A represents the safety valve
Model representation
Model representation
2 for external thread connection
8 represents unclosed full start
X indicates that the seat seal face is rubber
16 represents the nominal pressure 1.6Mpa
T indicates that the material is copper
main parameter
The main parameter of the safety valve of the air compressor is displacement. The displacement depends on the caliber of the valve seat and the opening height of the disc. It is divided into two kinds: the micro start type and the full start type according to the different opening height. The micro opening refers to the 1/40 ~ l/20 of the valve's opening height to the seat diameter of the valve seat. The full opening refers to the 1/4 of the valve's opening height to the seat diameter of the valve.
Selection
Nominal pressure is determined by the operating pressure of the safety valve, temperature determined by the operating temperature range of safety valve, the constant pressure value of constant pressure spring or lever determine the scope of the calculated safety valve, according to the decision to use media materials and structure type safety valve, safety valve leakage calculated safety valve throat according to the size of. The following are the general rules for the selection of the safety valves.
(L) a hot water boiler is generally used as a micro open safety valve with an unsealed wrench.
(2) a steam boiler or a steam pipe is generally used as a full open safety valve with an unsealed wrench.
(3) water and other liquid incompressible media generally use a closed micro open safety valve or safety relief valve.
(4) high pressure water supply is usually closed all open safety valves, such as high pressure water supply heater, heat exchanger and so on.
(5) gas and other compressible media generally use closed full open safety valves, such as gas storage tanks, gas pipelines, etc.
(6) the E steam boiler is generally used as a static gravity type safety valve.
(7) large diameter, large displacement and high pressure system usually use pulse type safety valves, such as temperature reducing and decompression equipment, power plant boiler and so on.
(8) the general use type safety valves for the transport of liquefied gas, such as train tankers, car tankers, tanks, etc., as shown in Figure 4.
(9) the top of the oil tank is usually with a hydraulic safety valve, which needs to be used in conjunction with the breathing valve.
(10) a pilot safety valve is generally used for underground drainage or natural gas pipelines, as shown in Figure 6.
(11) the safety reflux valve is generally used on the liquid reflux pipeline at the outlet of the tank pump of the liquefied petroleum gas station.
(12) a vacuum negative pressure safety valve is usually used for negative pressure or negative pressure in the process of negative pressure or operation.
(13) the bellows safety valve is generally used in the container or pipeline system with large back pressure fluctuation and toxic flammable.
Safety valve check of air compressor
The need to check the safety valve has five kinds, the first is the safety valve for the first time use or the use of price over a long time, the second is the safety valve need to regularly check the routine, the third is the safety valve by the corrosion and damage is serious, fourth is the safety valve of the valve plate is lost. The fifth is the safety valve seal damage.
Check principle is the safety valve, pressure condition check medium in the above 20Mpa under the access to the entrance of the acceptance check valve, when the medium pressure rises to a certain extent, the safety valve of the valve will be opened, then the recorded value at a pressure and opening pressure and adjust the pressure of the throne to open the specified value, so check the opening pressure is finished, and then wait for the opening pressure of the pressure drops to 90%, using methods such as observation of pressure gauge check valve has no medium leakage, this one is in sealing check valve.