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PTFE lined non return valve with flanged body and lined bore preventing reverse flow
Lined Valves

PTFE Lined Non Return Valve

Lined check valve, NB 1" to 10"

Lined non-return valve preventing reverse flow on corrosive lines — NB 1" to 10", face to face 127 mm to 300 mm, lined in PFA or FEP.

Request a quotation Full technical data and dimensions Request the datasheet
At a glance
Product typeLined non-return (check) 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 10"

Product overview

What it does, and where it fits.

A non-return valve stops flow reversing when a pump trips or a line is depressurised. On corrosive duty that matters twice over: it protects the pump, and it stops aggressive product being pushed back into a section that is not rated for it.

The body is a casting to ASTM A 216 Gr. WCB, lined and flanged to ASME/ANSI B16.5 Class 150. Its face-to-face dimensions match the lined ball and plug valves exactly, so the three are interchangeable in a pipework layout at the same bore.

Features

Built into every unit.

  • Automatic prevention of reverse flow — no operator action needed
  • Cast body to ASTM A 216 Gr. WCB, lined and flanged to B16.5 Class 150
  • NB 1" to 10", face to face 127 mm to 300 mm
  • Face-to-face interchangeable with the lined ball and plug valves
  • Stainless steel body on request

Benefits

Why it earns its place in the line.

  • Protects pumps from reverse rotation and damage on trip
  • Prevents aggressive product backflowing into unrated sections
  • 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

  • Pump discharge protection on corrosive service
  • Preventing backflow between process sections
  • Common headers fed by more than one pump
  • High-purity duties where metal pick-up is unacceptable

Industries served

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

Technical data

Specification for PTFE Lined Non Return Valve.

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

PTFE Lined Non Return Valve — technical specification
Product typeLined non-return (check) 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 10"
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
Face to face127 mm to 300 mm, tolerance ±3 mm
PTFE Lined Non Return Valve — face to face and lining availability
SizeFace to face L (±3)PTFEPFAFEP
1"127—✓✓
1.5"165—✓✓
2"178—✓✓
2.5"190—✓✓
3"203—✓✓
4"229—✓✓
6"267—✓✓
8"292—✓✓
10"300—✓✓

All dimensions in mm. Face-to-face matches the lined ball and plug valves of the same bore.

Available on request

  • Stainless steel body

FAQ

Questions we are asked about this item.

Check the flow arrow on the body and confirm the mounting orientation with us — some check valve patterns are horizontal-only while others will work vertically with upward flow.

Both prevent reverse flow. This item is listed NB 1" to 10" with face-to-face 127–300 mm; the swing check valve is listed NB 3" to 14" with a much shorter face-to-face of 38–88 mm, so it suits a wafer-style installation between flanges.

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

Not sure which spec fits your process?

Send your requirement — media, temperature, pressure, dimensions — and we'll recommend the right product or fabricate it.

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