1, the structure of the safety valve can be divided into: ⑴ hammer (lever) type safety valve: lever and hammer to balance the pressure valve. Hammer safety valve by moving the weight of the hammer position or change the weight to adjust the pressure. It has the advantage of simple structure; the disadvantage is more heavy seat back low. This structure of the safety valve can only be used for fixed equipment. ⑵ spring-type safety valve: the use of compression spring force to balance the valve flap pressure and make it sealed. Spring-loaded safety valve by adjusting the amount of compression spring to adjust the pressure. Its advantage is that the weight than the weight safety valve small size, light weight, high sensitivity, the installation position is not strictly limited; disadvantage is that the force acting on the stem changes with the spring deformation. At the same time, we must pay attention to the heat insulation and heat dissipation of the spring. Spring-loaded safety valve spring force generally not more than 2000 kg. Because too hard spring is not suitable for accurate work. ⑶ pulse safety valve: pulse relief valve by the main valve and auxiliary valve. The main valve and auxiliary valve together, through the auxiliary valve pulse driven main valve action. 2, the maximum opening height of the safety valve disc and seat diameter ratio, but also can be divided into: ⑴ micro-type: the valve opening height of the valve seat diameter 1/20 ~ 1/10. Due to the small opening height, design, manufacture, repair, and test are more convenient, but less efficient. ⑵ full Kai type: valve opening height for the seat diameter of 1/4 ~ 1/3. Due to the open height, design, manufacture, repair, and test are more complex, but more efficient. 3, safety valve body structure can be divided: ⑴ fully enclosed: no leakage to the media when discharging, and all through the drain to let go. (2) Semi-closed: When discharging medium, one part is discharged through the drain pipe and the other part is leaked outwards from the place where the valve cover and the stem co-operate. ⑶ open type: When the medium is discharged, it is not drawn to the outside and excreted directly by the valve petitioner.
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