1, by the use of media
Safety valve for steam (usually with a48y as the representative)
Safety valve for air and other gases (usually with a42y as the representative)
Safety valve for liquid (usually with A41H as the representative)
2, nominal pressure points
Low pressure safety valve: the valve nominal pressure PN ≤ 1.6Mpa
Pressure safety valve safety valve of the nominal pressure Pn2.56.4mpa:
High pressure safety valve safety valve of the nominal pressure Pn10.080.0mpa:
Ultra high pressure safety valve safety valve pressure PN: '100MPa nominal
3, according to the applicable temperature
Ultra-low temperature valve: t ≤ 100℃ safety valve
Low temperature safety valve: 100℃ < 40℃ safety valve.
Safety valve: 40℃ at room temperature; < 120℃ safety valve
Temperature safety valve: 120℃
Temperature safety valve: t> 450℃ safety valve
In particular, in view of the actual situation of domestic spring, when the safety valve for 350℃ the above conditions, mostly with a radiator or valve cover made of flower type, so that the spring can better heat dissipation, the spring always keep in 350℃ the following work, ensure that the rigidity is constant, so as to ensure the safety valve to open and the back seat and other properties.
4, connection points by
Flange series of safety valve. Safety valve inlet and outlet pipe connection flange form, the form of flexible.
Thread series of safety valve. Safety valves and pipes connecting thread of imports, exports and flexible forms of.
Welding series of safety valve. Safety valves and pipes connecting thread of imports, exports and flexible forms of.
5, divided by structure
According to structural features or the maximum opening height and valve seat diameter ratio (h/d), security can generally be divided into the following several:
Lever hammer safety valve.
Spring type safety valve. The compression spring force to balance the pressure valve, and valve to seal. See if a42y16c type safety valve.
Pulse safety valve. Pulse safety valve is also called the pilot-type safety valve. It is the main valve and the auxiliary valve design together, driving the main valve action through the auxiliary valve of the pulse. This structure is often used for large diameter, large discharge capacity and high pressure system. Pulse safety valve such as type wfxd.
Enlight-type safety valve. Valve opening height of the seat diameter of 1/40∽ 1/20, such as a27w-10t, A47H and 16C safety valve.
Safety valve. Such as A47H - 16C type safety valve. Valve opening height of the seat diameter of 1/4.
Closed safety valve. Such as A47H - 16C type safety valve.
Semi closed safety valve. Such as the a48y-16c safety valve.
Open safety valve. (a48y-16c safety valve is open)
Pilot operated safety valve. If wfxd type safety valve.
6, according to the classification of seal pair
Cemented carbide cemented carbide sealing. Suitable for high temperature and high pressure situations, especially in high pressure and high temperature steam.
2Cr13 2cr13r sealing. Use in the general situations of saturated steam and superheated steam, or the temperature is lower than 450℃ the vessel or pipe other medium.
Sealing surface of the valve seat is 2Cr13, the sealing surface of the valve clack is cemented carbide. High-pressure steam and flow rate used in large, easy erosion caused by other media of the sealing surface.
The valve seat sealing surface of alloy steel, PTFE valve sealing surface. Applicable to the petroleum or natural gas medium, sealing requirements strictly, but the temperature is lower than 150℃.
Sealing is austenitic stainless steel. This valve body, valve cover for austenitic stainless steel, used in the medium containing acid, alkali and other corrosive components.
7, according to the principle of action classification
Direct acting safety valve. Safety valve depend directly on the force generated by the medium pressure to overcome the mechanical load on the valve flap to open the valve.
Pilot operated safety valve. From the main valve and pilot valve, mainly rely on to drive or control valve the media discharged from the pilot valve.
With added load type safety law. To remain open before the pressure of a sealed additional force increase in the inlet pressure, the additional stress release reliable safety valve in the valve opening pressure.
8, according to the operation characteristics of classification
Proportion of the role of safety valve. Safety valve opening pressure increased gradually with the change in pressure.
Two section type safety valve. (jumping action type safety valve). Open the process is divided into two stages, the first valve with the pressure increasing and the proportion of open, numerical increase a little in the pressure, the valve flap in the pressure is almost no increase in the case of rapid opening to the height of the safety valve set.
9, an opening height classification
Enlight-type safety law. Safety valve opening height to diameter in the range of 1/401/20.
Safety valve. Opening height of not less than the diameter of 1/4 safety valve flow to.
Kai - type safety valve. Weiqi safety valve opening height is between the type and the full opening of the.
10, there is no back pressure balance mechanism classification
Pressure balance type safety valve. The use of bellows, a piston or diaphragm balance pressure action of the original, so that the valve opening pressure of safety valve before the valve on both sides of the interaction of balance.
The conventional safety law. Safety valve without pressure balance.
11, according to the valve loading mode classification
Hammer or hammer lever-type safety valve. The use of hammer directly loaded or by a heavy hammer through the safety valve lever loading.
Spring type safety valve. The compression spring loaded safety valve.
Type safety valve chamber. The safety valve of compressed air loading.
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