... 2,30 technology patents 2,BV&CE Cheap!! Gas detector alarm system with shut off valve 1. FeaturesLightweight, low-cost valve for ... close.3.Solenoid enclosures High-quality plastic solenoid enclosuresDust-proof, water proof, explosion-proofDegree of protection is generally 4. Size ... voltage of the associated supporting products with valves(such as alarm) match, so as not to damage the solenoid valve ...