Air release vacuum breakers are designed to protect the air conditioner against overpressure in the system. They are used in systems where the discharge line from the condenser is routed through a trapped area such as a crawl space or attic. If there is any rupture or leakage in this line, it could cause an overpressure condition that could damage or even destroy the equipment. The air release vacuum breaker senses these high pressures and opens a valve to bleed off some of the excess pressure. Normally, these valves are installed at the discharge port of the condenser unit and they should never be adjusted.
Bray’s SlurryTuff™ brand includes the EZI-VAC line of air release and vacuum break valves. Available in single-acting, double-acting, and triple-acting models, the valves are designed to discharge large amounts of air from pipelines while being filled.
Engineered for extreme conditions, EZI-VAC operating features include:
Air Release/Vacuum Break
This valve uses a single moving part — a spherical float. As media fills the valve, the float is guided toward an annular seal ring, creating a positive seal that increases as pressures rise.
The spherical float is available in two material options:
Air Release/Vacuum Break & Air Release
This valve uses two floats — a cylindrical float and a disc float — contained in a stainless steel cage. The disc float contains a secondary stainless steel outlet, which exhausts air while under pressure.
The floats are both made of the same material:
Vacuum Break Only
This valve uses a spring-loaded disc, which is biased to remain closed, unless a vacuum is drawn. The vacuum works on the disc to compress the spring, thus allowing air into the pipeline.
The disc is available in two material options, determined by a combination of size and working pressure:
Purpose Air Release | Vacuum Break
Size Range DN 25 to 400 | NPS 1 to 16
Temperature Range Up to 80°C | Up to 176°F
Pressure Ratings1 ANSI B16.5 Class 150/300/600 @ 35°C Nominal
Connection2 Flanged ANSI B16.5 RF Class 150/300/600 (or as requested)
NOTES
1 All Bray valves are tested to 110% of rated pressure to ensure bubble-tight shutoff.
2 All international flanges available on request.
Contact Bray for more information.
Valve Design ASME B16.34
Flange Drilling ASME B16.5
Process Piping ASME B31.3
Testing AS 4037-1999 EN 12266 Pt 1 & 2 API 598 AWWA M51
Approvals Canadian CRN
Long-lasting and maintenance-free, all EZI-VAC valves are built to meet and exceed the high demands of heavy duty slurry air release valves.
Valve Design ASME B16.34
Flange Drilling ASME B16.5
Process Piping ASME B31.3
Testing AS 4037-1999 EN 12266 Pt 1 & 2 API 598 AWWA M51
Approvals Canadian CRN
Optional configurations, materials, and linings allow customization to suit your specific requirements.
All valve styles use a 40 DURO natural rubber annular seal. Its large sealing surface rolls with the float as it closes, creating a bubble-tight seal.
1 ON-SITE INSPECTION: Removable bonnet for valve inspection, cleaning, or modification.
2 SEAL TO ATMOSPHERE: Standard nitrile o-rings are used for a high-pressure seal.
3 SPHERICAL FLOAT: Urethane coated, lightweight aluminum core or high-density polyethylene (HDPE).
4 PRIMARY SEAL: The seal is designed for full-bore airflow, and constructed of material selected specifically for slurry and heavy-duty applications.
5 BODY: Fully fabricated from carbon steel or cast steel. Internal lining is optional.
6 END CONNECTION: For ease of maintenance, the EZI-VAC valve is normally fixed to an isolation valve, which is in turn fastened to a stand pipe.
7 BODY COATINGS: The internal and external body have a minimum coat of 250 micron DFT. The body is coated with a hard, two-part epoxy paint, applied in a Bray standard red finish, that provides excellent corrosion and wear resistance.
8 FASTENERS: Fasteners are carbon steel galvanised structural assemblies.
9 LABEL PLATE: (Not shown) The stainless steel label details valve model and serial numbers.
10 FLUSH PORT: Based on valve size, either 1⁄2 or 1 inch flush port is fitted to de-pressurise the valve during maintenance, or for flushing when required.
11 SEAL RETAINER/LOCATING RING: The seal is housed in the HDPE locating ring, which aligns with the float and outlet, to guide the float as the valve closes — creating a positive seal under all conditions.
12 APPROVED LIFTING LUG: To aid during transporation, installation, or removal.
1 ON-SITE INSPECTION: Removable bonnet flange for valve inspection, cleaning, or modification.
2 SEAL TO ATMOSPHERE: Standard nitrile o-rings are used for a high-pressure seal.
3 CYLINDRICAL FLOAT & DISC FLOAT: Both made of high-density polyethylene (HDPE).
4 PRIMARY SEAL: The seal is designed for full-bore airflow, and constructed of material selected specifically for slurry and heavy-duty applications.
5 BODY: Fully fabricated from carbon steel or cast steel. Internal lining is optional.
6 END CONNECTION: For ease of maintenance, the EZI-VAC valve is normally fixed to an isolation valve, which is in turn fastened to a stand pipe.
7 BODY COATINGS: The internal and external body have a minimum coat of 250 micron DFT. The body is coated with a hard, two-part epoxy paint, applied in a Bray standard red finish, that provides excellent corrosion and wear resistance.
8 FASTENERS: Fasteners are carbon steel galvanised structural assemblies.
9 LABEL PLATE: (Not shown) The stainless steel label details valve model and serial numbers.
10 FLUSH PORT: Based on valve size, either 1⁄2 or 1 inch flush port is fitted to de-pressurise the valve during maintenance, or for flushing when required.
11 STAINLESS STEEL CAGE/LOCATING RING: Aligns with the float and outlet, to guide the float as the valve closes — creating a positive seal under all conditions.
12 APPROVED LIFTING LUG: To aid during transporation, installation, or removal.
13 SECONDARY OUTLET (316SS): To exhaust entrapped air while in operation.
1 ON-SITE INSPECTION: Removable bonnet flange for valve inspection, cleaning, or modification.
2 SEAL TO ATMOSPHERE: Standard nitrile o-rings are used for a high-pressure seal.
4 PRIMARY SEAL: The seal is designed for full-bore airflow, and constructed of material selected specifically for slurry and heavy-duty applications.
5 BODY: Fully fabricated from carbon steel or cast steel. Internal lining is optional.
6 END CONNECTION: For ease of maintenance, the EZI-VAC valve is normally fixed to an isolation valve, which is in turn fastened to a stand pipe.
7 BODY COATINGS: The internal and external body have a minimum coat of 250 micron DFT. The body is coated with a hard, two-part epoxy paint, applied in a Bray standard red finish, that provides excellent corrosion and wear resistance.
8 FASTENERS: Fasteners are carbon steel galvanised structural assemblies.
9 LABEL PLATE: (Not shown) The stainless steel label details valve model and serial numbers.
10 FLUSH PORT: Based on valve size, either 1⁄2 or 1 inch flush port is fitted to de-pressurise the valve during maintenance, or for flushing when required.
11 STAINLESS STEEL SPRING ASSEMBLY/LOCATING RING: Aligns the vacuum disc. The disc stays closed at all times, only opening when there is a vacuum.
12 APPROVED LIFTING LUG: To aid during transporation, installation, or removal.
At Bray, we understand you are constantly faced with the need to safely and reliably isolate many different types of processes. To make this easier, Bray has an extensive isolation valve portfolio comprised of high-performance butterfly valves, ball valves, and knife gate valves. These valves are designed and tested to provide the reliability necessary to keep your processes operating at maximum efficiency.
SERIES 40/42 & 41/43
Double offset butterfly valve features an innovative design that offers rugged reliability and bidirectional shutoff to full rated pressure.
SERIES F15/F30
Two-piece body with floating ball design offers low torque and increased cycle life. An ideal solution for tight shutoff in a wide range of industrial applications.
SERIES 740
One-piece cast body with flexible wire reinforced elastomer seat for bidirectional zero leakage shutoff in a wide range of industrial applications.
SERIES 768
Two-piece bolted body with twin elastomer seats and a push-through gate designed for bidirectional zero leakage shutoff with self cleaning in demanding slurries.
Knife Gate Valves
Butterfly Valves
Related Pages
Related Terms
air release valve air pockets piping systems internal pressure air valve air release valves system start up piping system high point air release pipeline efficiency full pressured pipeline vacuum breakers pressured pipeline