American AFC Vertical Indicator Post – Model 5100

The American AFC Model 5100 Vertical Indicator Post is an important fire protection system component used to operate buried or difficult-to-access gate valves while providing a clear visual indication of whether the connected valve is open or shut.

The indicator post is installed above ground and connects to a buried NRS gate valve through an adjustable operating stem. This allows the valve to be opened or closed from ground level without direct access to the underground valve.

Key Features:

• Vertical indicator post.
• Model 5100.
• Clearly indicates valve status as OPEN or SHUT.
• Enables operation of buried or difficult-to-access valves from ground level.
• Designed for use with NRS gate valves.
• Compatible with valve sizes from 4 to 12 inches.
• Adjustable telescoping stem.
• Normally eliminates the need for field cutting.
• Open and shut signs can be adjusted by removing the post head.
• Locking wrench can be secured with a padlock.
• Suitable for installation above buried fire-water piping.
• Internally and externally epoxy painted in RAL 3000 red.
• UL Listed as shown in the catalogue.
• FM Approved as shown in the catalogue.
• Compatible with the American AFC A-3100 PIV-NRS Gate Valve.
• Suitable for sprinkler, hydrant and standpipe systems.
• Provides quick visual verification of isolation-valve position.

Operation:

The indicator post connects to the operating nut of the buried valve through an internal operating stem.

When the upper operating wrench is rotated:

• The rotational movement is transferred to the internal stem.
• The stem operates the underground NRS gate valve.
• The indicator mechanism moves within the upper post head.
• The OPEN sign is displayed when the valve is open.
• The SHUT sign is displayed when the valve is closed.

This allows the valve position to be confirmed without excavating or entering an underground valve chamber.

Field Adjustment:

Model 5100 includes an adjustable telescoping pipe and stem to suit the depth of the buried valve.

Basic adjustment steps include:

• Remove the post head to adjust the OPEN and SHUT targets.
• Adjust the telescoping stem and pipe to the required length.
• Attach the post base to the valve post plate using the supplied bolts and nuts.
• Align the operating stem with the valve operating nut.
• Verify correct OPEN and SHUT indication after installation.

Compatible Valve Sizes:

• 4 inches.
• 6 inches.
• 8 inches.
• 10 inches.
• 12 inches.

Main Model 5100 Dimensions:

• Dimension A: approximately 700 mm or 27.5 inches.
• Dimension B: approximately 1000 mm or 39.3 inches.
• Dimension C: approximately 1248 mm or 49.1 inches.
• Dimension D: approximately 297 mm or 11.7 inches.
• Base diameter: approximately 305 mm or 12 inches.

Trench Depth Range by Valve Size:

4-inch valve:
• Minimum: 34.65 inches.
• Maximum: 71.26 inches.

6-inch valve:
• Minimum: 39.76 inches.
• Maximum: 76.38 inches.

8-inch valve:
• Minimum: 44.29 inches.
• Maximum: 80.91 inches.

10-inch valve:
• Minimum: 48.62 inches.
• Maximum: 85.24 inches.

12-inch valve:
• Minimum: 53.54 inches.
• Maximum: 90.16 inches.

Associated A-3100 Valve Height by Size:

• 4 inches: 11.9 inches.
• 6 inches: 17.2 inches.
• 8 inches: 20.79 inches.
• 10 inches: 26.18 inches.
• 12 inches: 30.31 inches.

Main Construction Materials:

• Hex cap screws: Carbon Steel ASTM A307B.
• Hex nuts: Carbon Steel ASTM A307B.
• Crane coupling: Ductile Iron ASTM A536 Grade 65-45-12.
• Base flange: Cast Iron ASTM A126 Class B.
• Standpipe: Carbon Steel ASTM A53.
• 1-inch square operating stem: Carbon Steel AISI 1045.
• Main body: Cast Iron ASTM A126 Class B.
• Locking wrench: Ductile Iron ASTM A536 Grade 65-45-12.
• Target carrier nut: Stainless Steel AISI 304.
• Indicator targets: Cast Aluminum.
• Indicator windows: Plexiglass.
• Gasket: EPDM to ASTM D2000.
• Operating nut: Stainless Steel AISI 304.
• Top section: Cast Iron ASTM A126 Class B.
• Snap ring: Spring steel.
• Plugs and square nuts: Carbon Steel ASTM A307B.

Corrosion Protection:

The indicator post is internally and externally spray epoxy painted in RAL 3000 red to help protect the unit against corrosion and outdoor exposure.

Applications:

• Automatic sprinkler systems.
• Fire hydrant systems.
• Standpipe systems.
• Underground fire-water piping.
• External isolation valves.
• Industrial facilities.
• Warehouses and logistics developments.
• Commercial and residential projects.
• Airports and ports.
• Sites requiring ground-level operation and visual indication of a buried valve.

Standards and Approvals Shown in the Catalogue:

• UL Listed.
• FM Approved.

The final adjustment length and installation depth should be selected according to the NRS valve size, buried pipe elevation, finished ground level and project requirements.