The Principle Operation of Chemical Dispensers

The ASSE 1055 devices are effective as ASSE 1001 devices in protecting non-potable high hazard substances from entering the potable water system. The ASSE 1055 device consists of an elastomeric gap acting as a check valve that vents to atmosphere when the device in not under pressure.

The ASSE 1055 device is suitable for situations where there is backsiphonage and backpressure not to exceed 10 feet of head pressure. The ASSE 1055 device has a pressure bleed so when it is attached to a faucet downstream of an ASSE 1001 or ASSE 1011, it will open creating a constant flow. The ASSE 1001 and 1011 shall not be used where there is a downstream valve that would create constant pressure. Constant pressure is defined as more than 12 hours of continue use. When the ASSE 1055 is not in use the faucet shall be closed. The ASSE 1055 device dilutes a concentrated solution inline and the mixed solution can be dispensed. The ASSE 1055 Chemical Dispenser consist of a backflow prevention device and a mixing chamber. The ASSE 1055 device does provide high-hazard protection. The ASSE 1055 functions are similar to an atmospheric vacuum breaker ASSE 1001. The check valve is normally closed and when water is flowing a Venturi effect is created to draw in the chemical concentrate. Without line pressure and the elastomer seal the chemical concentrate will not flow. ASSE Standard 1055 allows for a hose connection to be installed on a faucet with an atmospheric vacuum breaker if a Bleeder T Device is used. The Bleeder T Device prevents damage to any upstream backflow protection device which is not rated for continuous supply pressure. In addition, by encouraging the user to turn off the faucet because of the visible flow of water, the device prevents hot/cold water cross contamination. The purpose of the ASSE 1055 is to allow a hose connection to be installed on a faucet downstream of an atmospheric vacuum breaker. It prevents damage to the atmospheric vacuum breaker by creating a visible flow of water from the faucet connection. This flow of water encourages the used to turn off the faucet after use.