What is a Post Indicator? When do I need one?

An indicator post, or an indicator post valve, is a valve assembly used to open or close the water supply main to a fire protection system. Post indicator valves are used in any application where responding firemen need a clear indication of the open or closed position of the valve, and an easy way to open or close the water supply from outside the building. Kennedy indicator posts and valves are UL listed and FM approved for this purpose.

The assembly consists of a conventional gate valve installed on the fire system water main, with the indicator post installed on a mounting plate on the bonnet.  The top of the indicator post features a window that clearly indicates if the valve is open or shut.

Indigo Piping Systems supplies a complete range of post indicator valves for installation in any type of fire protection system. Available end connections include:

    • Mechanical joint with accessories
    • Mechanical joint with accessories and IPS transition gasket
    • ANSI B16.1 class 125 flat faced flanges
    • Tyton (push-on joint) for DI or C900 PVC
    • Push-on joint for IPS PVC
    • Mechanical joint x flange

Indicator posts can have either adjustable or fixed lengths to accommodate different bury depths. Adjustable indicator posts have a telescoping underground section for field adjustment to the exact bury depth needed. They are selected based on a combination of the depth of bury of the water main and the size of the valves. See the sizing matrix below to select the correct indicator post.

Trench Depth Limits
Telescoping Barrel – Sizes B-E
  B Size C Size D Size E Size
Valve
4″
6″
8″
10″
12″
14″
Min.
31″
35″
42″
45″
49″
58″
Max.
51″
55″
62″
65″
69″
78″
Min.
49″
53″
60″
63″
67″
76″
Max.
69″
73″
80″
83″
87″
96″
Min.
67″
71″
78″
81″
85″
94″
Max.
87″
91″
98″
101″
105″
114″
Min.
88″
92″
99″
102″
106″
115″
Max.
111″
115″
122″
125″
129″
138″

 

Maximum Trench Depth
Fixed Length Posts – Sizes F-H
Valve F Size G Size H Size
4″
6″
8″
10″
12″
14″
45.5″
49.5″
54.5″
59″
64″
69″
63.5″
67.5″
72.5″
77″
82″
87″
87.5″
91.5″
96.5″
101″
106″
111″

 

Contact us today to request a quote on indicator post valves.