The safety valve is a indispensable safety equipment of air compressor. It's working by the balance theory of air pressure and spring and protect the air compressor system impactful. The SNPN brand safety valve is made of classy brass material and they are very popular by customer from domestic and abroad by good shape, high quality, high precision, good seal and others excellence. At the same time, some of them have passed the CE & ASME certificate. We have different size 1 / 4" & 1 / 2".