Spectacle Blind Flange, as its name implies, is shaped like a figure of eight. It has a blind plate at one end and a throttling ring at the other end. When fluid is transported, the throttling ring is used, and the blind plate is used when cutting off, which is a bit like a shut-off valve. Function, it can be used to cut off when the valve leaks. Its sealing performance is relatively good. For systems that require complete isolation, they are generally selected as reliable isolation means. There should be two shut-off valves before and after Spectacle Blind Flange. When all of them are closed, switch to Spectacle Blind Flange. Common heat exchanger commissioning and standby, reactor commissioning and standby, nitrogen pipeline and process pipeline connection, etc. Another feature is that the logo is obvious and it is easy to identify its installation status.
The main function of Spectacle Blind Flange is to completely isolate it, just like a gate valve that is 100% reliable and will not be operated by humans.
Spectacle Blind Flange general purpose:
1. System media pipelines such as steam purging pipelines and oil-based process media pipelines have a stable isolation effect. At this time, Spectacle Blind Flange should be installed on the side close to the system media pipeline. Of course, for the online disassembly of Spectacle Blind Flange, a gate valve should be installed on the side close to the process medium pipeline. Such Spectacle Blind Flange is generally marked as normally closed.

2. The flammable or toxic medium pipelines entering and exiting the device should be equipped with double gate valves. For double gate valves, see Spectacle Blind Flange. Such Spectacle Blind Flange is generally marked as normally open.
3. The device will be used during driving. The pipeline that no longer passes through the medium after driving normally should be installed with a gate valve. The Spectacle Blind Flange is installed on the side of the pipeline where the normal five medium flows. The Spectacle Blind Flange is generally marked as normally closed.
When choosing Spectacle Blind Flange, it should be matched with the flange that clamps it. The length of the bolts used for clamping should be appropriately lengthened according to the thickness of the blind plate.
The effect of installing Spectacle Blind Flange is only one point: it can be absolutely cut off. That is, in important parts. Although there are valves in many places, the reliability of the valves is difficult to grasp.
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