Blind Gaskets

Blind gaskets are used when locking a pipe for maintenance tasks or to perform pressure tests. The materials, permissible temperatures and pressure level will generally be specified in a pipe class. Where that is not the case, the required thickness of the blind gasket must be calculated in accordance with AD 2000 B5 or DIN EN 12952.


Blind gaskets are used to shut off a pipeline during maintenance or pressure testing. The materials, permissible temperatures and pressure levels are usually defined in a pipe class at the customer. Since 2016, plug-in windows no longer comply with the IGR Standard 12-0090 but with DIN 2626 and ASME B16.48.

This provides a first national standard for sheaves which incorporates the numerous company-specific guidelines, such as e.g. to replace the IGR standard. For the production of blind gaskets after American standard, we refer to the ASME B16.48.


  • Blind gaskets
  • Throttle plate
  • Swivel glasses

Shapes / structures

• Flat face flange: Shape A
• Raised face flange: Shape B [B1 and B2]
• Tongue and groove flange: Shape C and shape D
• Male/female flange: Shape E and shape F
• Custom shape according to drawing


Standard material: 1.4571. Other materials available upon re-
quest. Max. permissible operating temperature and operating
pressure are material-dependent:


Pressure level (e.g., PN 25)
Nominal size (eg DIN 200)
Material number. (e.g., 1.4571)
Temperature (e.g., 120 ° C)
Bore diameter (e.g. D = 40 mm), throttle plates only
Manufacturer’s mark IDT GmbH