Ball Check Valve

A ball check valve is a type of valve used in plumbing. It consists of a ball that opens and closes depending on the direction of flow. Ball check valves are typically used to prevent backflow from entering the water supply system, which can cause contamination.

The ball check valve was invented by William H. Howell in 1927. This type of check valve is different from other types of valves because it uses a ball instead of a disc or flapper to stop flow in one direction. A disc-style check valve uses a flap or disc that opens when pressure is applied, allowing water to flow through the pipe. When there is no pressure on the flap, it closes in order to stop flow through the pipe. Ball check valves work similarly but use a ball that moves freely inside its housing until pressure builds up behind it, causing it to lock in place and stop flow through the pipe.

When pressure builds up behind a ball check valve, it forces its way into its seat and prevents any more water from flowing through it. The ball then locks into place so that no more water can pass through until pressure drops again and allows for movement again

A RELIABLE INVESTMENT

Bray’s SlurryTuff™ brand includes the MAXI-CHECK line of ball check valves and ball check isolation valves. Available in high pressure high wear, low pressure & low wear and dual function check/isolation models. They are designed to prevent reverse flow, and in the case of the Model I, prevent reverse flow with isolation.

OPERATING CONDITIONS

Specifically designed for extreme applications, such as slurry, ash disposal, and mine dewatering that produce heavy scale (such as salts).
CWP of 7 to 150 bar (100 to 2175 psi).
Standard operating temperature up to 80°C (176°F).

APPLICATIONS OPERATING FEATURES

Engineered for slurry service, MAXI-CHECK operating features include:

Full bore design — provides unrestricted flow ensuring low pressure loss and minimum back pressure to seal.
Large port — prevents clogging.
High-wear resistant seat and ball design — offers large sealing area, to provide drip-tight sealing under all conditions.
Sinking ball design – preferred for applications involving viscous liquids or slurries.
Self-cleaning — the ball rotates during operation eliminating the risk of impurities adhering to the ball.
Fabricated design — low weight and allows for inline repairs.
Operation — suitable for horizontal or vertical applications
Slurry pipelines
Power plant ash disposal
Mine dewatering
Pipelines with scale
Pulp & paper
Water & wastewater
High pressure pipelines

SPECIFICATIONS

Purpose Non Return | Isolation

Size Range DN 80 to 750 | NPS 3 to 30

Temperature Range Up to 80°C | Up to 176°F

Pressure Ratings1,2 ANSI B16.5 Class 150/300/600 & 900 @ 65°C (150°F) Nominal

Connection3 Flanged ANSI B16.5 RF Class 150/300/600 & 900 (or as requested)

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

CUSTOMIZABLE FOR YOUR NEEDS

Long-lasting and maintenance-free, all MAXI-CHECK valves are built to meet and exceed the high demands of heavy duty slurry ball check valves. Optional configurations, materials, and linings allow customization to suit your specific requirements.

MATERIALS & OPTIONS

Body & outlet materials include carbon steel, 316/304 stainless steel.
- Optional: Duplex and super duplex stainless steel.
Exterior epoxy coatings suitable for highly aggressive environments.
Standard inner lining of natural rubber, with nitrile or bromobutyl options.
Replaceable ball available in stainless steel, silica bronze/urethane-coated aluminum materials.
Replaceable seat in 304 stainless steel or hardened carbon steel (matched to the ball).
Drain/flush port in body.

HIGH PRESSURE SEAT, BALL & SEAL DESIGN

NOTES

1 ANSI 150 as standard, consult Bray for other pressure ratings.

2 All Bray valves are tested to 110% of rated pressure to ensure bubble-tight shutoff.

3 All international flanges available on request.

Contact Bray for more information.

For high-pressure applications over 35 bar, the Model H & Model I valves use a 40 SHORE hardness molded rubber annular seal.

Bubble tight shut-off is achieved by back pressure forcing the seal against the ball.

NOTES

1 Shown with Silica bronze sinking ball.

2 Molded rubber annular seal.

3 Stainless steel seat.

AVAILABLE MODELS

MODEL I | High Pressure • Dual Function

Ball Check Valve with Isolation

This valve features mechanical isolation ensuring the ball is held in the closed position. The valve comes fully lined with natural rubber, and polyurethane coated ball as standard. It can be configured to suit your particular service conditions with a choice of liner materials, ball types and actuation options.

(refer to page 5 for material options)

When the pump starts, the pressure forces the ball off the seat and into the tower. When the pump stops, the ball returns to the seat and is held in the closed position by the back pressure creating a positive seal. The valve can now be isolated using the bevel gear operator or actuator to mechanically hold the ball in the seat to achieve valve isolation.

MODEL H | High Pressure • High Wear

Ball Check Valve
The valve utilizes the same valve design as the fully featured model I. However it does not provide valve isolation. The valve can be configured to suit your particular service conditions with a choice of liner materials and ball types. (refer to page 5 for material options)

MODEL L | Low Pressure • Low Wear

Ball Check Valve
Robust, simple and cost-effective one-piece body. Designed with the same face to face dimensions as a swing check allows a direct replacement without the need for pipe modifications and spool pieces. The valve comes unlined as standard.

However, rubber-lined is available on request. Bubble tight shut-off is achieved by back pressure forcing the ball against the integral body steel seat. The advantage of this compact design is a single moving part and no external components ensuring ongoing reliability.

FEATURES & BENEFITS | MODEL I

1 ORIENTATION: Suitable for horizontal or vertical installations without any customization required.

2 CONSTRUCTION: Full bore design and simple construction ensures low pressure drop and minimum back pressure to seal.

3 BALL: Self cleaning urethane-coated, aluminum core, stainless steel or silica bronze ball rotates with the flow, preventing scale build up.

4 PRIMARY SEAT: The seat is designed for full-bore flow, and constructed of material selected specifically for slurry and heavy-duty applications.

5 BODY: Fully fabricated from carbon steel for low weight and ease of customization. Lined with a choice of three materials.

6 ON-SITE INSPECTION: Removable bonnet flange for valve inspection, cleaning, or maintenance.

7 SEAL TO ATMOSPHERE: Standard nitrile o-rings are used for a high-pressure seal.

8 END CONNECTION: Available in a wide range of end connections, including ANSI and DIN.

9 BODY COATINGS: The 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.

10 FASTENERS: Fasteners are high tensile galvanized carbon steel structural grade.

11 LABEL PLATE: The stainless steel label details valve model and serial numbers.

12 FLUSH PORT: Based on valve size, either 1⁄2 or 1 inch maintenance, or for flushing when required.

13 APPROVED LIFTING LUG: To aid during installation, or removal.

14 VALVE ISOLATION: Can be achieved with manual, pneumatic, hydraulic or electric actuation.

FEATURES & BENEFITS | MODEL H