A sanitary tank bottom valve supports near-complete vessel drainage through a flush internal profile, smooth transition radius, and direct mounting at the tank outlet. The geometry reduces liquid retention, while body material, seal, connection, pressure, and temperature must match the process conditions.

How Geometry Supports Complete Drainage

A tank bottom valve is installed at the lowest point of a vessel so gravity can move liquid toward the outlet. Its internal contour reduces steps, pockets, and abrupt changes between the tank floor and discharge passage.

The referenced design uses a contoured radius, tapered hole, and spherical surface close to the tank bottom to reduce retained medium and maintain a direct drainage path.

The Drainage Path

1. Tank outlet: The valve is positioned directly at the vessel bottom.
2. Smooth transition: The contour reduces abrupt flow changes.
3. Tapered passage: The smooth opening limits material accumulation.
4. Gravity discharge: Tank contents move toward the lowest outlet.

This geometry suits processes where residual product affects yield, cleaning, or product changeover.

Material and Seal Selection

The listed sanitary tank bottom valves use 304 or 316L stainless steel, with PTFE, TFM 1600, and UHMWPE sealing options. The published range covers 1–4 inch sizes, temperatures from -20°C to 150°C, and pressure ratings from 8–30 bar.

Material and seal selection should consider several operating conditions:

• Body material: SS316L suits higher corrosion exposure, while SS304 fits many general hygienic services.
• Seal material: PTFE, TFM 1600, and UHMWPE should be matched to the process medium.
• Temperature: The seal and body must remain within their rated temperature range.
• Pressure: The valve rating should exceed the actual process pressure.

Why a Tank-Mounted Valve Reduces Retention

A sanitary tank bottom valve differs from an inline valve installed below a vessel with an additional pipe section. Direct mounting places the valve opening closer to the vessel floor and can reduce residual volume between the tank and valve.

A shorter flow path can support faster draining and reduce retained material. The referenced design also describes low flow resistance and an internal passage comparable to a pipe section of similar length.

For a tank bottom diaphragm valve, the same tank-mounted principle can be used when diaphragm isolation is required.

Connection Options and Installation

The listed connection options include clamp, threaded, and welded ends. Clamp connections suit removable assemblies, while welded connections fit fixed process lines where fewer detachable joints are preferred.

Installation should address the following points:

Alignment: Keep the valve inlet centered with the tank outlet.

Flow path: Avoid unnecessary reducers, steps, and liquid pockets.

Seal compatibility: Match the seal to the medium and cleaning cycle.

Operating limits: Verify pressure and temperature before commissioning.

Maintenance access: Leave space for inspection and seal replacement.

Applications and Process Benefits

This type of sanitary valve is used in wine, dairy, beverage, and pharmaceutical processing. Listed media include milk, beer, water, and oil.

Its main process advantages include:

• Lower residual product at the vessel outlet
• More direct gravity drainage
• Reduced liquid retention during product changeover
• Easier integration with hygienic cleaning procedures

The geometry becomes useful when drainage efficiency matters during product transfer and cleaning.

Selecting the Right Configuration

A sanitary tank bottom valve should be selected from tank geometry and process conditions together.

1. Tank outlet position and internal bottom shape.
2. Required drain rate and product viscosity.
3. Body and seal compatibility.
4. Connection standard and maintenance method.
5. Pressure and temperature limits.
6. Cleaning and sterilization procedure.

The internal geometry should create a continuous transition from the tank floor into the outlet, reducing dead zones and supporting repeatable drainage during production and cleaning.

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Drawings

Details

Application
Manual Tank Bottom Ball Valve With Flange Connection is mainly used in the wine brewing,dairy,beverage,and pharmaceutical industries.

Operating Principle
This ball valve with special tank bottom flange connection,be welded on the tank bottom.The design of contour and radius have effective gravity discharge function.Also smooth taper hole and the sphere closely to the bottom,which prevent the medium from staying at the entrance of valve.Make sure drain smoothly.

Design Features
Small fluid resistance,resistance equal to same length section of pipe
Simple structure,small volume,light weight
Easy to operate,open and close rapidly,from fully open to full closed only 90 degree rotation,convenient remote control.
Easy maintenance,simple structure,convenient to disassembly and replacement the seal ice seal,PTFE sealing,at fully open or fully closed,sphere and the sealing surface of valve seat are Isolate with medium.
When medium transiting ,these will not cause erosion of sealing surface.
Connection:clamp,weld,thred,flange