Ductile iron body for less weight and extra strength. Rubber-faced clapper hinged to access cover for quick removal and easy servicing. All moving parts can be serviced without removing the valve from the installed position. With the cover/clapper assembly removed, clapper rubber replacement requires removal of only one screw. External by-pass trim to minimize clapper movement and false alarm. Trim allows installation of optional non-interruptible pressure switch to activate an electric alarm panel and/or remote alarm. Can be installed on constant or variable pressure water supplies. Can be installed vertically or horizontally, with the access cover facing up. Valve housing tapped for inlet and outlet pressure gauges, alarm devices, and system main drain. Trim includes alarm test valve for testing alarms without reducing system pressure.
Nominal Size: 4 in.
Friction Loss*: 13 ft.
Description: Flange / Flange
Flange Drilling: ANSI
* Expressed in equivalent length of Schedule 40 pipe based on Hazen & Williams formula: C = 120.