Automation Industry 280 Series Safety Valve Besa Italy

Automation Industry 280 Series Safety Valve Besa Italy

BESA's main product lines:

139 threaded connection safety valve

240F threaded connection safety valve

249 threaded connection safety valve

130 flange connected safety valve

240 flange connected safety valve

250 flange connected safety valve

260 flange connected safety valve

280 flange connected safety valve

290 flange connected safety valve

Automation Industry 280 Series Safety Valve Besa Italy

(1) Classified by structural type According to the structural characteristics or the ratio of the maximum opening height of the valve disc to the diameter of the valve seat ( h/d) , safety Valves can generally be divided into the following types.

1) Lever heavy hammer safety valve .As shown in the figure 4-1shown ，The function of a heavy hammerThe force is amplified by a lever and loaded onto the valve disc .In the valve The magnitude of the load remains unchanged during the process of opening and closing the door ，Therefore, the force transmitted by the valve stem is basically constant .Its disadvantage is that it affects vibration More sensitive to movement ，And the recoil performance is poor .This type of safety valve structure can only be used on fixed equipment ，The weight of a heavy hammer should generally not be exceed 60kg , To avoid operational difficulties.

2) Spring type safety valve .Using the force of a compression spring to balance the pressure of the valve disc ，And seal it with a safety valve ，

The advantage of this type of safety valve is that it is lightweight compared to hammer type safety valves ，high sensitivity ，There are no strict restrictions on the installation location .shortcoming The force acting on the valve stem changes with the deformation of the spring； at the same time ，When the temperature is high ，Attention should be paid to the insulation of the spring and heat dissipation .The spring force of this type of safety valve should generally not exceed20000N； too large 、Hard springs are not suitable for precise operation.

3) Pulse type safety valve ，Also known as pilot operated safety valve .It designs the main valve and auxiliary valve together ，Pulse operation through auxiliary valve Drive the main valve to operate .This structure is usually used for large diameters 、Large displacement and highPressure system .Pulse type safety valve as shown in the figure 4-3place show ，picture 4-3a Main valve section ，picture 4-3b Auxiliary valve section.

picture 4-4 Pulse type safety valve for large diameter water supply pipelines ，It is also composed of a main valve and an auxiliary valve groupbecome .The auxiliary valve has a very large diameter Small direct load safety valve ，It is connected to the main valve .When the system experiences overpressure ，The auxiliary valve is first opened ，Emission medium ，thus Drive or control the opening of the main valve disc ，Large amount of emission medium.

4) Micro opening safety valve .The opening height of the valve disc is equal to the diameter of the valve seat 1/40 ~ 1/20 , The opening height of the valve disc of the safety valve very small ，Suitable for liquid media and situations with small displacement .fromLiquid media are incompressible .A small amount of discharge can increase pressure

5) Fully open safety valve .As shown in the figure 4-5b shown ，The opening height of the valve disc is the valve Seat diameter 1/4 ~ 1/3 .In the valve of the safety valveThere is a recoil disc at the valve position ，With the help of gas Expansion impulse of bulk medium ，Open the valve disc to a sufficient height ，Thus achieving displacement requirement .This type of safety valve structure is commonly used ，The sensitivity is also high ，But two adjustments The position of the joint ring is difficult to adjust ，It must be adjusted very carefully to meet the requirements ，this pair First time users encounter many difficulties .Therefore ，We have developed another oneA simplified knot constitute ，As shown in the figure 4-5b shown .The adjustment of this structure is relatively convenient ，But the spiritSensitivity is required Slightly affected .If used on general steam boilers and steam pipelinesnot a big impact.

6) Fully enclosed safety valve .As shown in the figure 4-2 shown ，When the safety valve is opened for discharge， The medium will not leak to the outside world ，And all are discharged through the excretory tubeRelease it .This structure is suitable Used for flammable purposes 、Explosive 、Toxic and harmful media.

7) Semi closed safety valve .As shown in the figure 4-1shown ，safetyWhen the valve is opened for discharge， Part of the medium is discharged through the discharge pipe ，And the other part comes from the valveThe fit between the cover and the valve stem Leakage outwards .This type of safety valve is suitable for general steam and has no pollution to the environment Dyeing medium.