scope:

Description

This standard applies only to those devices which are designed to be installed on the discharge side of the hose bibb, hydrant, or faucet which is fitted with hose threads. The design embrace a check valve member force loaded, or biased, to a closed position, and an atmospheric vent valve, force loaded, or biased, to an open position when the device is not under pressure. This device shall not be subjected to more than twelve (12) hours of continuous water pressure. This device shall only be used on systems where the only source of low head back pressure comes from an elevated hose equal to or less than 10.0 feet (3.0 meters) in height.

Sizes

Sizes include ½ NH, ¾ NH and 1 NH male hose threaded outlets.

Pressure

The devices shall be designed for a working pressure of at least 125 psi (862 kPa).

Temperature Range

The devices shall be designed for flow temperatures of 33 °F to 180 °F (0.56 °C to 82 °C).

Atmospheric Vent

a) The atmospheric vent shall be open when the supply pressure is at atmospheric as defined in Section 3.7.

b) The atmospheric vent shall open when subjected to conditions defined in Section 3.9.

c) Atmospheric vent(s) (air inlets) shall be of a nonstandard plumbing connection.