ZEROVAL Tank Bottom Ball Valves — three designs for every application.
Our tank bottom ball valves — also called bottom outlet valves or vessel drain valves — ensure residue-free emptying of tanks, reactors and stirred vessels. Three designs (ZEROVAL-BF, -FLV, -LOW) cover the full range from DN 15 to DN 350 — cavity-free, piggable and FDA compliant.
Which bottom outlet for which vessel?
All three ZEROVAL tank discharge valves share the same hygienic core (cavity-free, piggable, CIP/SIP) and differ primarily in size range and optimization target.
ZEROVAL-BF — the standard size.
The ZEROVAL-BF is the standard tank discharge valve for compact reactors and stirred vessels. With DN 15 to DN 100 it covers the entire mid-range of typical pharma and food applications.
The right choice when you need a compact, robust bottom outlet for standard applications — from pilot plants to medium-sized production vessels.
| Nominal size | DN 15 – DN 100 |
|---|---|
| Connections | OD/ID per DIN EN 10357 series A/B and ISO 1127 |
| Material | Stainless steel 1.4404 |
ZEROVAL-FLV — for large-volume tanks.
The ZEROVAL-FLV is the large-volume version of the bottom outlet valve for storage tanks and large production vessels. With DN 50 to DN 350 it also covers outlets on reactors and storage tanks in the multi-cubic-meter range.
The right choice when large volumes, high flow rates or highly viscous media (chocolate, pastes, paints, adhesives) require a correspondingly sized outlet valve.
| Nominal size | DN 50 – DN 350 |
|---|---|
| Connections | OD/ID per DIN EN 10357 series A/B and ISO 1127 |
| Material | Stainless steel 1.4404 |
ZEROVAL-LOW — cost-optimized.
The ZEROVAL-LOW (internal: ECOLINE) is the cost-optimized design for medium vessel sizes. With DN 25 to DN 200 it sits exactly between BF and FLV — and is the economical choice for standard applications without special requirements.
The right choice when the core features (cavity-free, piggable, CIP/SIP capable) are sufficient and budget matters — typically in series plants with many identical tank discharge valves.
| Nominal size | DN 25 – DN 200 |
|---|---|
| Connections | OD/ID per DIN EN 10357 series A/B and ISO 1127 |
| Material | Stainless steel 1.4404 |
What all three ZEROVAL bottom outlet valves have in common.
The designs differ in size and optimization — the hygienic core is identical across all three tank discharge ball valves.
- Fully cavity-free transition to the vessel bottom — flush, no gaps, no dead space.
- Residue-free emptying — of tanks, reactors and stirred vessels.
- Piggable — full bore without obstructions.
- CIP/SIP capable — fully cleanable in installed condition.
- FDA-compliant seals — PTFE / modified PTFE per FDA and EC 1935/2004.
- Optional — trace heating, pneumatic actuator, flushing connection.
Where our tank bottom ball valves work.
Pharma
Reactors and stirred vessels with high cleanability and sterility requirements.
Food
Chocolate, sauces, pastes — even highly viscous and crystallizing media drain residue-free.
Cosmetics
Mixing tanks and storage vessels for creams, emulsions and lotions.
Chemicals
Paints, adhesives, reaction media — also reliable as a sump drain for crystallizing or sticky substances.
Tank bottom ball valve answers.
What is a tank bottom ball valve?
A tank bottom ball valve — also called bottom outlet valve or vessel drain valve — sits directly at the lowest point of a tank, reactor or stirred vessel and enables residue-free emptying. Unlike seat valves, the ball closes the outlet cavity-free and flush with the vessel wall.
What is the difference between a bottom outlet valve and a vessel drain valve?
Both terms refer to the same component: a valve at the bottom of a vessel for emptying. Technically correct is tank bottom ball valve, since the closure is achieved by a ball. In everyday language, bottom outlet valve and vessel drain valve are common synonyms.
Which ZEROVAL design fits which tank size?
ZEROVAL-BF (DN 15–100) is the standard size for compact reactors. ZEROVAL-LOW (DN 25–200) is the cost-optimized variant for medium vessels. ZEROVAL-FLV (DN 50–350) covers large-volume tanks and storage vessels.
Are the tank bottom ball valves piggable?
Yes. All three ZEROVAL designs have full, unobstructed bores and are therefore piggable. Even highly viscous or crystallizing media can be drained without residue.
Are the bottom outlet valves CIP/SIP capable?
Yes. All ZEROVAL tank bottom ball valves are fully cavity-free and CIP/SIP capable. The transition to the vessel bottom is flush — no gaps, no dead space.
Which design fits your tank?
Tell us vessel size, medium and connection type — you typically receive datasheet and recommendation within one working day. Includes consultation on actuator selection (manual or pneumatic) and options like trace heating or flushing connection.