Restrictors can be used as simple isolating plates with an attached gripper plate for inserting between the conduit flanges with different surface thicknesses or as an weld variation. The bore is finished as a basic cylindrical. This also can be eccentrically arranged for special applications.
Multi-hole apertures and multi-level restrictors are then used when acoustic pressure limits are required. Calculation The calculation of the restrictor aperture is based on the ISO 5167. If requested the sound pressure (dBA) can be calculated.
The installation occurs between flanges corresponding to DIN or ANSI with different forms of surface thickness (flat / groove / spring / projection / back crack / ring joint (RTJ)). With weld variations the connection is adapted to the existing piping.
The construction strengths of the restrictor apertures are calculated from the nominal width, the material, the pressure loss and the working temperature. The calculation of the construction strength is according to the valid AD leaflets and tables. An example curve is shown.
The materials used can be taken from the table on Page 1 .
Certificates regarding material e.g., according to EN 10204 3.1 or 3.2 are delivered upon request