Bottom Outlet Body Styles

Bottom Outlet Body Styles

2017-01-04

For nearly 25 years the radial diaphragm style valve has been the preferred choice for bottom outlet valves in a wide range of high purity industries including cosmetics, pharmaceuticals and especially biologics. The Rattiinox CAD Bottom Outlet Valve represents the latest generation of radial diaphragm valves and incorporates a number of unique features that make the valve more reliable and easier to service. 

The use of a radial diaphragm valve is well advised because the design puts the seal of the valve at the low point apex of the bottom dish. In a mixing application this is critical in order to prevent a pocket where solids can collect and not be thoroughly incorporated or kept into suspension. The Rattiinox CAD BTV is available in two main body and diaphragm styles – standard as well as extended diaphragms. The benefit of the extended diaphragm is the valve body can now be incorporated into the tank insulation and sheathing. This eliminates the requirement to build an alcove for the valve and a potential hot or cold spot at the bottom of the vessel.

The CAD Bottom Outlet Valve is available in 18 different standard configurations in either standard or extended diaphragms and in all sizes from ½” to 4”. As standard the valve can have a butt-weld or sanitary clamp outlet connection as well as an integral satellite valve that can also be supplied in a number of configurations in order to best fit your process requirements and conditions. The modular design concept and the experience of Rattiinox also allows for easy customization and fast delivery if required.

Rattiinox has decades of experience as a reliable manufacturer of aseptic valves and also with the use of PTFE as a valve diaphragm material. The primary CAD valve diaphragm is precision machined from solid PTFE block and is internally supported with a stainless steel armature and is standard for all bottom outlet valves and process valves. The connection to the actuator allows the diaphragm to find its center on the valve body and this has two critical benefits.  The design assures the diaphragm is in the correct position to make a positive body seal. In addition, this unique design does not deform the diaphragm.  The valve can be disassembled for inspection, and if required the same diaphragm can be reused. Customer installations and internal testing has proven that the CAD PTFE diaphragm can be reliably sealed multiple times and still meet a 6 bar (90 psi) shut-off. The CAD valve diaphragm is also highly resistant to vacuum forces, even under hot conditions and will also reliably maintain a positive seal under cryogenic conditions (-60°C with 6 bar Nitrogen for 24 hours).

First generation radial diaphragm valves with an EPDM elastomer diaphragm have a secondary body seal. If product gets trapped between the seals there is no way to know and no way to clean this area. The CAD valve with its single seal eliminates this possibility. Other valves also incorporate a bellows in the diaphragm which can inhibit thorough cleaning. And unlike some elastomeric diaphragms, the PTFE diaphragm on the CAD valve will not stick to the sealing surface and does not contain any additives or surface treatments designed to prevent sticking and which can also come dislodged from the diaphragm and find their way into the process. Some common diaphragm materials are less prone to sticking but because of their inherent porosity can develop internal fissures and blisters that can trap both condensate and product. The solid PTFE diaphragm of the CAD valve eliminates this possibility.

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