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ASSE 1020

Performance Requirements for Pressure Vacuum Breaker Assembly

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Organization: ASSE
Publication Date: 1 January 1998
Status: inactive
Page Count: 21
scope:

Description

Vacuum breakers, other than air gaps, shall be classified into four general types:

a. Atmospheric Type (See ASSE Standard #1001) b. Pressure Type (ASSE #1020, as described in this standard); c. Back Siphonage (See ASSE Standard #1056); and d. Pressure Type (See ASSE #1058).

Size Range

The assembly shall be designed to accommodate nominal pipe sizes 15 to 50 mm (1/2" to 2" inches).

Working Pressure Range

Assemblies shall be designed for a minimum rated working pressure of at least 1034 kPa (150 p.s.i).

Temperature Range

a. Cold water service shall range from 0.55 degrees C to 43 degrees C (33 degrees F to 110 degrees F).

b. Hot water service shall range from 0.55 degrees C to 82.2 degrees C (33 degrees F to 180 degrees F) minimum.

Application

Pressure vacuum breaker assemblies are for installation in water supply lines to prevent the entrance of non-potable material into the potable water supply by backsiphonage only. It is not for use in any system where backpressure can be applied to the assembly.

When a supply pressure is between 7 to 14 kPa (1 to 2 p.s.i.), the air inlet valve is open and the assembly will continuously discharge. Due to this probability of water discharge from the atmospheric air inlet valve, the assembly shall only be installed where water discharge does not cause damage.

Document History

February 1, 2004
Performance Requirements for Pressure Vacuum Breaker Assembly
Description The assembly shall contain an independently acting check valve force loaded to the closed position, and an independently acting air inlet valve located downstream of the check valve that...
February 1, 2004
Performance Requirements for Pressure Vacuum Breaker Assembly
A description is not available for this item.
February 1, 2004
Performance Requirements for Pressure Vacuum Breaker Assembly
A description is not available for this item.
ASSE 1020
January 1, 1998
Performance Requirements for Pressure Vacuum Breaker Assembly
Description Vacuum breakers, other than air gaps, shall be classified into four general types: a. Atmospheric Type (See ASSE Standard #1001) b. Pressure Type (ASSE #1020, as described in this...
January 1, 1989
Performance Requirements for Pressure Vacuum Breaker Assembly (Recommended for Outdoor Usage)
A description is not available for this item.
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