MECHANICAL TYPE STEAM DRAIN VALVE

The utility model relates to a new mechanical steam drain valve. The characteristic that buoyancy can be produced when float volume is used to drain is used, and the buoyancy is completely used as force for opening a valve; working performances that the water hammer resistant intensity and freezing resistance are improved, steam is blocked and water is drained, water is continuously and proportionally drained, etc. are achieved; the manufacture difficulty and the production cost are reduced. The device uses the elastic force of a spring to overcome the gravity produced by the material weight of a float; the float is provided with a valve clack, the thick-wall cylindrical bottom of the float can not leak steam, and the opening of the float is downward; accordingly, the float becomes an object which has volume and has no gravity to act on a valve seat; the buoyancy produced by the draining of the float volume is completely used as the force for opening the valve. The utility model is suitable for the occasion that a steam system blocks the steam and drains water.