Air Release Vacuum Breaker Valve

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.

Vacuum Breaker Valves A Reliable Investment

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.

OPERATING FEATURES

Engineered for extreme conditions, EZI-VAC operating features include:

Full bore design — provides high discharge and intake capabilities.
Large port — prevents clogging.
High-wear seat and float design — offers large sealing area, to provide drip-tight sealing under all conditions.
Self-operating — no actuator required.
Simple construction — allows for ease of maintenance.
Fabricated design — allows for inline repairs.
Specifically designed for extreme conditions, such as slurry, dirty water, and applications that produce heavy scale (such as salts). > CWP of 20, 50 and 100 bar (290, 725, and 1450 psi). > Standard operating temperature up to 80°C (176°F).
Slurry pipelines
High pressure pipelines
Pipelines with scale
Waterlines
Mine dewatering
Sewage
Deep well pumping

OPERATING CONDITIONS APPLICATIONS

MODEL EV | Single Entry • Double Action

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:

Urethane-coated, lightweight aluminum core — for pressures reaching 3,000 kPa.
Solid, high-density polyethylene (HDPE) — for pressures reaching 10,000 kPa

MODEL ET¹ | Single Entry • Triple Action

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:

Cylindrical float in high-density polyethylene (HDPE)
Disc float in high-density polyethylene (HDPE)

MODEL EB | Single Entry • Single Action

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:

High-density polyethylene (HDPE)
Stainless steel

SPECIFICATIONS

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 Ratings¹ANSI B16.5 Class 150/300/600 @ 35°C Nominal

Connection²Flanged 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.

DESIGN STANDARDS

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

CUSTOMIZABLE FOR YOUR NEEDS

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.

MATERIALS & OPTIONS

Body & outlet materials include carbon steel, 316/304 stainless steel, duplex stainless steel, super duplex, and Hastelloy.
Exterior coatings suitable for highly aggressive environments.
Standard inner lining of natural rubber, with urethane or EPDM options.
Optional configurations, materials, and linings allow customization to suit your specific requirements.
Replaceable float available in HDPE, urethane-coated aluminium, or custom materials.
Replaceable locating seat in HDPE.
Anti-surge or soft-close device, to prevent high-velocity closure.
Drain/flush point in body.
Bird screen available on some models.

BUBBLE TIGHT SEAL SHUTOFF

DESIGN STANDARDS

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.

Replaceable float available in HDPE, urethane-coated aluminium, or custom materials.
Replaceable locating seat in HDPE.
Anti-surge or soft-close device, to prevent high-velocity closure.
Drain/flush point in body.
Bird screen available on some models.

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.

MODEL EV

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.

MODEL ET¹

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).