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PTFE lined flush bottom valve with 45 degree outlet, heights H and H2 and lined vessel connection
Lined Valves

PTFE Lined Flush Bottom Valve

Lined tank bottom outlet valve, 2"×1" to 6"×4"

Lined vessel bottom outlet valve that seats flush with the vessel floor, leaving no dead pocket — four combinations from 2"×1" to 6"×4".

Request a quotation Full technical data and dimensions Request the datasheet
At a glance
Product typeLined flush bottom (tank outlet) valve
Body / steel gradeASTM A 216 Gr. WCB
Lining materialPTFE / PFA / FEP
Liner standardASTM D 3307 (PFA), ASTM D 4894-19
Lining optionsVirgin or anti-static (conductive black) PTFE to ASTM D 4894 & D 4895, PFA to ASTM D 3307, FEP to ASTM D 2116
Flange standardASME/ANSI B16.5
Flange classClass 150 standard; Class 300 on request
Size rangeNB 1" to NB 6" — combinations 2"×1" to 6"×4"

Product overview

What it does, and where it fits.

A flush bottom valve mounts on the bottom outlet of a reactor or storage vessel with its closure member sitting flush against the inside of the vessel floor. That leaves no pocket below the outlet where product can stagnate, degrade or fail to drain — the problem with fitting an ordinary valve below a bottom nozzle.

For batch processing that means complete drainage between batches, no cross-contamination and no dead leg for solids to settle into. The lined version keeps the whole wetted path, including the seat face presented to the batch, in fluoropolymer.

The item is specified by two bores: the vessel connection and the outlet. Two heights are given, H overall and H₂, and the outlet is arranged at 45°.

Features

Built into every unit.

  • Closure seats flush with the vessel floor — no dead pocket
  • Four combinations from 2"×1" to 6"×4"
  • 45° outlet arrangement
  • Cast body to ASTM A 216 Gr. WCB, lined and flanged to B16.5 Class 150
  • Stainless steel body on request

Benefits

Why it earns its place in the line.

  • Complete drainage between batches — no residue and no cross-contamination
  • No dead leg for solids to settle or product to degrade in
  • Outstanding corrosion resistance to aggressive organic and inorganic chemicals across a wide temperature range
  • Non-stick, non-wetting bore — low surface energy keeps product moving and simplifies cleaning
  • Chemically inert and pure; no additives, plasticisers, stabilisers or lubricants to contaminate the process fluid
  • The lowest coefficient of friction of any solid, reducing pressure drop and deposit build-up

Applications & industries

Where it is specified.

Typical applications

  • Reactor and storage vessel bottom outlets
  • Batch processing where complete drainage between batches is required
  • Duties where a dead leg would allow product degradation or solids build-up
  • Sampling from the vessel bottom

Industries served

  • Chemical processing
  • Pharmaceutical
  • Petrochemical
  • Oil & gas
  • Power generation
  • Pulp & paper
  • Mining & metallurgy
  • Agrochemicals & dyes

Technical data

Specification for PTFE Lined Flush Bottom Valve.

Figures below are for this product only — every item in the range carries its own dimension table.

PTFE Lined Flush Bottom Valve — technical specification
Product typeLined flush bottom (tank outlet) valve
Body / steel gradeASTM A 216 Gr. WCB
Lining materialPTFE / PFA / FEP
Liner standardASTM D 3307 (PFA), ASTM D 4894-19
Lining optionsVirgin or anti-static (conductive black) PTFE to ASTM D 4894 & D 4895, PFA to ASTM D 3307, FEP to ASTM D 2116
Flange standardASME/ANSI B16.5
Flange classClass 150 standard; Class 300 on request
Size rangeNB 1" to NB 6" — combinations 2"×1" to 6"×4"
Temperature rangeContinuous service to 260 °C (PTFE melting point 327 °C, PFA 306 °C, FEP 260 °C)
Pressure ratingASME/ANSI B16.5 Class 150 flanges as standard; Class 300 available on request
Manufacturing standardASTM F 1545
Spark testingEvery lined component spark tested at 5000 × E volts (E = liner thickness in mm), to a maximum of 15 000 V
Hydro testingHydrostatic or pneumatic test according to the lining technique; hydrostatic test on components with vent holes
InspectionDimensional and visual examination of liner and steel parts — weld aspect, overall dimensions, collar size, liner thickness, surface flaws and paint thickness
External protectionZinc epoxy primer, minimum 60 μm dry film, over steel sand-blasted to SA 2.5
CertificationEN 10204 3.1 mill certificates and FDA certification for the fluoropolymer available on request
Outlet arrangement45°
PTFE Lined Flush Bottom Valve — heights and lining availability
SizeHH₂PTFEPFAFEP
2"×1"220100—✓✓
3"×2"430160—✓✓
4"×3"500220—✓✓
6"×4"600330—✓✓

All dimensions in mm. The first figure is the vessel connection, the second the outlet. Allow the H dimension below the vessel for installation and removal.

Available on request

  • Stainless steel body

FAQ

Questions we are asked about this item.

At least the H dimension — 220 mm for the 2"×1" up to 600 mm for the 6"×4" — plus room to withdraw the valve for maintenance.

Because the nozzle and the valve body above the ball form a pocket that never drains. Product sits there between batches, degrades and contaminates the next one. A flush bottom valve seats at the vessel floor and removes the pocket entirely.

Enquiry

Tell us your line size — we'll confirm the spec.

Send the bore, the media, the temperature and pressure, and the flange standard you work to. Drawings and custom sizes welcome.

Enquire on WhatsAppChat to us on +91 90336 30547 Request the datasheetWe will email the drawing for this item Talk to a technical expertMaterial selection and duty review Send a drawingWe fabricate to your isometric or sketch Request a custom sizeNon-standard bores, lengths and drilling

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