安全阀

　　A47H型弹簧微启式安全阀适用于工作温度≤200℃的空气、氨、石油气等介质的设备和管路上。A21W型适于工作温度≤200℃含腐蚀性的气体或液体的设备和管路上，A21F型适于工作温度≤200℃的液化气、石油气等设备和管路上，作为超压保护装置。当设备和管路内压力超过允许值时，阀门自动开启，继而全量排放;当压力降低到规定值时，阀门自动关闭，保证设备和管路安全运行。

　　结构简述

　　1、弹簧微启式安全阀具有结构简单、密封性能好、开启压力准确、排放能力大、回座压差小、调整方便等特点。

　　2、喷嘴型阀座：阀座为位伐尔喷嘴型阀座，蒸汽流经阀座出口处时达到音速，排放系数大，阀座密封面堆焊钴铬钨硬质合金，耐磨抗冲蚀，寿命长。

　　3、热弹性阀瓣：阀瓣设计为热弹性结构，利用其在介质压力下微小的变形，提高密封能力，克服安全阀在介质压力下临近整定压力时的前泄现象。阀瓣密封面采用先进的激光淬火技术，提高了硬度、耐磨性、抗冲抗性。

　　4、调节螺母：通过调整调节螺母，调整弹簧压缩量，使阀门能够很方便、很迅速地获得准确的整定压力。

　　5、背压调整套：调整阀瓣背压的辅助机构，通过背压调整套调整，可获得合适的回座压差。上调时，使阀门背压降低。下调时，使阀门背压提高。

　　一、弹簧微启式外螺纹安全阀

　　A21F-16C A21F-25C A21F-40C A21H-16C A21H-25C A21H-40C A21H-64 A21H-100 A21H-160 A21H-320 A21W-16P A21W-25P A21W-40P A21Y-64P A21Y-100P A21Y-160P A21Y-320P A21W-16R A21W-25R A21W-40R

　　二、弹簧式外螺纹安全阀

　　A27H-10 A27H-16 A27H-16C A27W-10P A27W-16P A27W-10R A27W-16R A28H-10 A28H-16 A28H-10C A28H-16C A28W-10P A28W-16P A28W-10R A28W-16R A27W-10T

　　三、弹簧微启式安全阀

　　A41H-16C A41H-25C A41H-40 A41H-64 A41H-100 A41H-160 A41H-320 A41Y-16P A41Y-25P A41Y-40P A41Y-64P A41Y-100P A41Y-160P A41Y-320P A41Y-16R A41Y-25R A41Y-40R A41Y-64R A41Y-100R A41Y-160R A41Y-320R A41W-16P A41W-25P A41W-40P A41W-64P A41W-100P A41W-160P A41W-320P A41W-16R A41W-25R A41W-40R A41W-64R A41W-100R A41W-160R A41W-320R

　　四、弹簧全启式安全阀

　　A42H-16C A42H-25C A42H-40 A42H-64 A42H-100 A42H-160 A42H-320 A42Y-16C A42Y-25C A42Y-40 A42Y-64 A42Y-100 A42Y-160 A42Y-320 A42Y-16P A42Y-25P A42Y-40P A42Y-64P A42Y-100P A42Y-160P A42Y-320P A42Y-16R A42Y-25R A42Y-40R A42Y-64R A42Y-100R A42-160R A42Y-320R A42W-16P A42W-25P A42W-40P A42W-64P A42W-100P A42W-160P A42W-320P A42W-16R A42W-25R A42W-40R A42W-64R A42W-100R A42W-160R A42W-320R A42F-16C A42F-25C A42F-40

　　五、带扳手弹簧微启式安全阀

　　A47H-16C A47H-25C A47H-40 A47H-64 A47H-100 A47Y-16C A47Y-25C A47Y-40 A47Y-64 A47Y-100

　　六、带扳手弹簧全启式安全阀

　　A48H-16C A48H-25C A48H-40 A48H-64 A48H-100 A48H-160 A48H-320 A48Y-16C A48Y-25C A48Y-40 A48Y-64 A48Y-100 A48Y-160 A48Y-320 A48Y-16P A48Y-25P A48Y-40P A48Y-64P A48Y-100P A48Y-160P A48Y-320P A48W-16P A48W-25P A48W-40P A48W-64P A48W-100P A48W-160P A48W-320P A48Y-16R A48Y-25R A48Y-40R A48Y-64R A48Y-100R A48Y-160R A48Y-320R A48W-16R A48W-25R A48W-40R A48W-64R A48W-100R A48W-160R A48W-320R

　　七、双联弹簧式安全阀

　　A43H-16C A43H-25C A43H-40 A38Y-16C A38Y-25C A38Y-40 A37H-16C A37H-25C A37H-40