When to Use sanitary ball valve supplier？

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Mechanism of Operation — Quarter Turn

Fluid flow gets directed through the port by rotating the spherical disc. So the port gets aligned with the fluid pathway. Rotation can be manual or automatic. In manual, you make use of a handle to manipulate the valve’s port position. However, automatic valves actuators make the ball change position on its own.

In manual control, the handle is usually aligned with the port position. And all you have to do to is turning the handle through 90 degrees to orient the port to the fluid path.

Closing the valves means reversing the port position. So it’s perpendicular to the fluid paths effectively blocking the fluid flow. This 90-degree turn is why the ball valve falls into the category of other quarter turn valves.

But unlike its quarter turn valves counterparts, the sanitary ball valves simple design and mechanism of operation provide the typical control and tight shut-off suitable for use in sanitary applications.

Sanitary Ball Valve Applications

Sanitary ball valves are manufactured for applications that demand clean or hygienic processing. They’re usually used in biopharmaceutical, chemical, medical, food, beverage, dairy, and other personal care applications like cosmetics. The ball valve is deemed sanitary because:

• The valve limits crevices and cavities which would otherwise trap media and encourage bacterial activity.
• It makes use of but-weld, tri-clamp end, flanges, threads for tight-shut off to prevent contamination from outside sources.
• It makes use of FDA approved Teflon seats and other cavity fillers to limit fluid entrapment.
• It’s Aseptic because it has refined contact surfaces.

Sanitary Ball Valve Specifications

When getting sanitary ball valves for the various sterile processing applications, you have to consider what you need it for and its specifications such as diameter, operating temperature, material temperature, and the working pressure. The diameter measurement should be taken across the cylindrical port.

Measurement can be pipe measure (Nominal Pipe Size) or tubing measure (Outside Diameter, OD). Tubing measure is most common. Almost all sanitary piping measurements are taken in tube OD, which means the outside diameter of the tube should be the one considered.

You can also get sanitary ball valves with more than one inlet and outlet ports. For example, there’re sanitary ball valves with T or L port ball drilling that make them either: 2-way ball or 3-way ball valves. But radiuses have to be within the minimum standard to limit the entrapment of media.

Working pressure, on the other hand, is the level of pressure the valve has meant to function in. The standard pressure ratings are 800 PSI or 1000 PSI. The operating temperature is the ambient range of temperatures in which the valve functions well. Material temperature is the media (fluid) temperature the valve seat can handle.

Materials

Sanitary ball valves can be metallic or plastic. The following metal and their various alloys are the common choices: steel, copper, iron, brass, bronze, stainless steel and cast iron. Other noble alloys include the AL6XN and Hastelloy. However, they’re only available in limited size and quantities.

You can get the duplex and super duplex ball valves for corrosion resistant applications. Plastic options, on the other hand, are PVC, glass-reinforced nylon, CPVC, and PVDF. Plastic bodies are suitable for low temperature and pressure applications.

Cavity fillers for non-retention Sanitary Ball Valves include the following FDA approved hygienic elastomers: Teflon PTFE seat, Teflon plus Viton which prevents fluid retention and bacteria build up.

Depending on your preference you can get sanitary ball valves with the following manual or automatic actuator Pneumatic, Electric Motor, and Hydraulic.

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Pneumatic actuators are stimulated by the air pressure while the liquid pressure controls the hydraulic actuators. Handle or lever types can go from the luxurious trigger systems to the locking pull-stop mechanism.

Design Features

Sanitary ball valves make use of the following features.

Full Bore Design that maintains fluid pressure.

Sanitary ball valves can be designed with full-opening valves such that the ball port diameter matches the pipeline. This way, when opened, the fluid flows freely with virtually minimum pressure drop. The free flow makes the Full Port Type Sanitary Ball Valve suitable in applications that require inspections without stopping the fluid flow.

Reduced Bore Design for high-velocity flow

Sanitary ball valves can also have ports that are smaller than the pipeline. Thereby they reduce the flow surface area and in turn increasing velocity. It’s, however, not suitable for thick or less viscous fluids.

Good Surface Finish

Ra is a measure used to categorize the quality of the contact surfaces. It’s determined by measuring the average distance between troughs and peaks of the metal surface. The measurement should be taken in micro-inches with 32 being the minimum Ra for a valve to be rendered as “sanitary.” Ra requirements in the various industrial applications differ, for biopharmaceutical, for example, the range is 15-20 Ra.

A sanitary ball valve enables on/off control and full, unencumbered flow of media. With a full bore design, sanitary ball valves minimize fluid pressure drop, since the bore (port) through the valve is the same diameter as the connecting pipe.

This design is ideal for handling viscous liquids, liquids containing particles and processing systems with mandated hygiene standards. Also called hygienic ball valves for this reason, sanitary ball valves are required for applications in which the media flowing through the valve is prone to spoil in a short amount of time, such as in dairy processing. They are not, however, required for all consumable food or beverage applications.

These valves are deemed sanitary because:

• The full-bore design reduces crevices and cavities that may trap media and allow bacterial growth
• They most often feature tri-clamp fittings, which help prevent external contamination
• Their seats and cavity fillers are made from FDA approved hygienic elastomers (such as Teflon) to limit media entrapment
• They feature polished, and therefore aseptic, surfaces

Sanitary ball valves are typically made of high-quality stainless steel. However, if installed to control media with more relaxed hygiene requirements, sanitary ball valves can be made from copper, iron, metal alloys, PVC or glass-reinforced nylon. Plastic sanitary ball valves are often approved for low-pressure or low-temperature applications. These valves can be supplied in manual or automatic operation.

When selecting sanitary ball valves, it is also important to consider how the valve will be cleaned. Tri-clamp connections are a common feature in sanitary applications, since they allow the valve to be easily removed from service for cleaning. Many valve manufacturers now offer ball valves that allow for CIP (clean-in-place). These valves feature a purge port through which steam or a cleaning agent can be introduced to clean the valve without removing it from service.

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