scope:

Description

These devices shall consist of two independent checks, force-loaded or biased to a closed position, with an atmospheric vent located between the two check valves, which is force-loaded or biased to an open position, and a means for attaching a hose. A field testability requirement shall verify the integrity of the outlet check valve and the opening of the atmospheric vent. The devices shall be classified as follows:

a) Type A devices automatically drain the water when the hydrant valve is closed and the hose removed to prevent damage from freezing.

b) Type B devices automatically drain the water with a hose removed or attached, end nozzle closed, and the hydrant valve closed.

Size Range

Outlet Sizes

Sizes shall include 1/2 NPHS, 3/4 NPHS, and 1 NPHS male hose threaded outlets.

Inlet Sizes

Sizes shall include, but not be limited to, 1/2 NPS, 3/4 NPS, or 1 NPS.

Connections

Garden hose connection threads shall be garden hose couplings per ANSI/ASME B1.20.7.

Pressure

The devices shall be designed for a minimum static pressure range of 20.0 - 125.0 psi (137.8 - 861.8 kPa).

Temperature range

The devices shall be designed for flow temperatures from 33.0 - 140.0 °F (0.6 - 60.0 °C).

Repairability

Devices shall be designed and constructed such that, after installation, repair or replacement of the elastomeric parts shall be accomplished using standard tools. Construction shall permit field service without damaging or marring the surface of the device.

Atmospheric Port

The atmospheric port shall be a non-standard plumbing connection.