MODEL 7043 FLANGE ADAPTER - ANSI CLASS 300

The Model 7043 flange adapter allows for a direct connection with ANSI Class 300 flanges.  The specially designed gasket enables the transition from a grooved system to a flanged system or component with this single flange.  2” through 8” Model 7043 flange adapters are supplied hinged as a single assembly, while larger sizes are supplied with separate segments.  The Model 7043 flange adapters are comprised of two identical ductile iron segments complete with an EPDM gasket and two pairs of bolts and nuts.  The flange segments are painted black. 

The Model 7043 flange adapter has been designed with small projections on the outside face of the flange for mating with 1/16” (1.6 mm) raised face flanges.   For mating with flat-face flanges these projections must be removed, this can be accomplished with a grinder or other tool.

* Working Pressure is based on roll grooved standard wall carbon steel pipe.

Important Notes:

1. The Model 7043 flange adapter requires a hard flat face for effective sealing. Sealing surface D is the maximum inside face requirement, sealing surface E is the minimum outside face requirement. If the mating flange face is outside these dimensions, a flange gasket and model 49 sandwich plate (Model #49, see cut sheet #V-03) must be used. With the serrated faces of some valves or rubber-faced wafer valves, the mating surface might also be inadequate and a sandwich plate must be used.

2. The Model 7043 flange adapter has small triangular teeth inside the key shoulder to prevent the pipe from rotating. These teeth should be removed when being connected to schedule 5 pipe, plastic pipe or components or surfaces that could be damaged by these teeth.

3. The Model 7043 flange adapter shall not be used as anchor points for tie-rods across non-restrained joints.

4. When assembling a Model 7043 flange adapter against a butterfly valve or ball valve, make sure that the outside diameter of the flange adapters do not interfere with the valve actuator or the mounting pad of the actuator.

5. Bolt tightening sequence: Like a regular flange joint, it is important to make flange faces contact parallel. Tighten nuts alternately in the sequence of diagonally opposite pairs as shown below until the flange faces meet and make a metal-to-metal contact. When using two model 7041 flange adapters to mate pipe, or wafer / lug valves, the hinge point locations must be staggered 90° to each other, a model 49 sandwich plate must be used where appropriate, and flange adapter segment housings must remain parallel during nut tightening sequence.