Atmospheric discharge safety valves made of brass with stainless steel spring. Suitable for the protection of pressure tanks and systems for air and other neutral, non-poisonous and non-flammable gases which can be freely discharge into the environment. with twist-type lifting mechanism. Available models: 810sGK, Available in 1/4” up to 1”. All models are also available in Stainless Steel: series 410. Series 810 (Brass): 810sGK FKM with FKM seal ( 0.2 – 25 bar ), 810sGK PTFE with PTFE seal (25.1 - 50 bar ) 410sGK PTFE with PTFE seal ( 25.1 – 50 bar )