Devlon® V-API thermoplastic valve seats
Innovative Thermoplastic Engineering
Devlon® V-API valve seats
What is Devlon® V-API?
Inbuilt PMI Technology
Devlon® V-API has been developed by
James Walker in close cooperation with
the valve industry as the answer to the
search for a superior valve seat material.
In Devlon V-API, James Walker has created
a material that offers a cost effective
solution with superior performance –
performance that is protected by
Positive Material Identification Technology.
PMI Technology is a microscopic additive
incorporated within the Devlon polymer
that can be identified from the smallest
sample of material.
Specifically formulated to provide
enhanced performance across a wide
temperature and pressure range, Devlon
V-API is now widely specified by valve
manufacturers and has rapidly gained
approval for use by major oil and gas
producers.
Devlon V-API is a proprietary formula
developed by James Walker, which
includes additives that allow the material
to perform at higher pressures and
temperatures than the majority of soft
valve seat materials.
James Walker’s
total control over
formulation and
mixing ensures
total control over
quality and material
provenance
In safety critical applications such as
valves, it is vital that the material specified
is the material used. Devlon with PMI
Technology gives manufacturers and end
users the peace of mind that they are using
genuine Devlon polymer.
Physical Property
ASTM Test Method
Units
Value
Tensile strength 23°C
D638
MPa
79.92
Tensile strength -40°C
D638
MPa
109.52
Hardness
(Dry, as cast)
D785
Shore D
82/85
Deformation under load
140Kgf/cm at 23°C for 24 hrs
D621
%
1.0 / 2.0
Charpy impact strength at 23°C
D256
J/M
54.8
Water absorption 24 hrs
D570
%
0.105
Water absorption saturation
D570
%
3
Coefficient of friction
2
0.25 / 0.30 at 2000psi surface load dynamic on steel unlubricated
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Key to chart
Thermoplastic materials are used in
various applications throughout most
industries, therefore their resistance
to corrosion or chemical attack is well
documented.
‘A’ No attack, possibly slight absorption.
Negligible
effect on mechanical
properties.
If a thermoplastic material absorbs or is
attacked by a particular chemical either in
liquid or gaseous form, then the effect on
that material will depend on four factors:
1. The chemical concentration
2. Temperature
3. Applied stress
‘B’Slight attack by absorption. Some
swelling and a small reduction in
mechanical properties likely.
‘C’Moderate attack or appreciable
absorption.
Material will have limited life.
‘D’Material will decompose or dissolve in
a short time.
Devlon® V-API
Chemical resistance
CONCENTRATION
WEIGHT %
Devlon® V-API technical data
Acetaldehyde Aq
40
B
Acetamide Aq
50
A
Acetic Acid Aq
10
C
CHEMICAL
Acetone
A
Allyl Alcohol
A
Amines
D
Ammonia Aq
10
Ammonia Gas
Ammonium Carbonate Aq
10
Amyl Acetate
37
Amyl Alcohol
4. Duration of exposure
Where aqueous solutions are shown the
concentration as a weight percentage is
given.
Aq
= Aqueous Solution
When in a chemical environment
allowances must be made for possible
reductions in mechanical properties of
plastic materials. The exception to this
rule may be in the case of a bearing
where the presence of liquids on the
bearing surface may act as a lubricant
and increase the PV limit of the material in
question.
SAT
= Saturated Aqueous Solution
CONC= Concentrated Aqueous
Solution
A
A
A
Aniline
When absorption only occurs, the
changes in the material are generally
reversible if the chemical is removed,
however if chemical attack takes place
the changes are permanent.
A
B
C
Antimony Trichloride Aq
10
C
Barium Chloride Aq
10
A
Barium Sulfate Aq
10
Benzaldehyde
A
B
Benzene
A
Benzyl Alcohol
C
Benzoic Acid Aq
SAT
Beverages Aq Alcoholic
Carbonated
Bitumen
Bleaching Lye
10
100
Boric Acid Aq
C
B
B
B
B
B
A
Butyl Acetate
B
Butylamine
C
Butyric Acid Aq
20
Butyric Acid
B
Butyrolactone
Calcium Chloride (in Alcohol)
B
A
20
A
Camphor
A
Carbon Disulfide
A
Carbon Tetrachloride
Carnailite Aq
A
10
Catechol
Chloroacetic Acid Aq
A
C
10
Chloral Hydrate
C
C
Chlorine Aq
10
C
Chlorine Gas
100
C
Chlorobenzene
A
Chloroform
C
Chlorosulfonic Acid Aq
10
C
Chromic Acid Aq
1
B
Citric Acid Aq
10
B
Coconut Oil
A
Cresols
D
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3
Cupric Sulfate Aq
Cyclohexane
Cyclohexanol
Cyclohexanone
Decalin
Dibutyl Phthalate
Dichlorodifluoromethane
Dichloroethylene
Diethyl Ether
Diethylene Glycol Aq
Diesel Oil
Dimethyl Carbinol
Dimethyl Formamide
Dioctyl Phthalate
Dioxane
Edible Oils
Ethanol Aq
Ethyl Acetate
Ethyl Chloride
Ethylene Chloride
Ethylene Diamine
Ethylene Glycol Aq
Ferric Chloride Aq
Ferrous Chloride Aq
Fluorosilicic Acid Aq
Fluoroethane
Freon 12 (Arcton 12)
Formaldehyde Aq
Formic Acid Aq
Fruit Juices
Furfural
Heptane
Hexane
Hydrobromic Acid Aq
Hydrochloric Acid Aq
Hydrofluoric Acid Aq
Hydrogen Peroxide Aq
Hydrogen Sulphide Aq
Hydroquinone
Iodine (in Alcohol)
0.1
SAT
10
2
10
B
B
A
B
A
A
A
A
A
A
A
A
B
A
A
A
A
B
A
A
B
A
B
B
C
C
C
A
A
B
B
C
B
B
A
A
C
C
D
4
C
1
SAT
C
90
96
96
5
SAT
10
10
40
3
10
CONC
B
B
C
Isooctane
A
Isopropyl Alcohol
B
Isopropyl Ether
A
Lactic Acid Aq
Lead Acetate Aq
Lead Stearate
Linseed Oil
Lubricating Oils (Petroleum)
Lithium Bromide Aq
Magnesium Chloride Aq
Magnesium Hydroxide Aq
Magnesium Sulphate Aq
Maleic Acid Aq
Malonic Acid Aq
Manganese Sulfate
Mercuric Chloride Aq
Mercury
Methanol
Methyl Acetate
Methyl Ethyl Ketone
Methylpyrrolidone
Methylene Chloride
Milk
Mineral Oils
Naphthalene
Nitric Acid Aq
Nitrobenzene
Nitromethane
Oleic Acid
Oleum
Oxalic Acid Aq
Ozone
Paraffin
Perchloroethylene
Perchloric Acid Aq
Petrol
Petroleum Ether
Phenol Aq
Phenol (Molten)
Phosphoric Acid Aq
Potassium Acetate Aq
Potassium Bicarb. Aq
Potassium Bromide Aq
Potassium Carbonate Aq
Potassium Chloride Aq
Potassium Dichromate Aq
Potassium Ferricyanide Aq
Potassium Ferrocyanide Aq
Potassium Hydroxide Aq
90
10
0.3
3
10
50
60
10
60
90
5
30
30
B
B
A
A
A
D
A
A
A
C
C
A
C
A
B
A
A
A
B
A
A
A
C
D
B
B
A
D
B
C
A
B
C
A
A
D
D
D
B
C
D
A
A
A
A
A
B
B
B
10
50
A
C
50
10
10
10
CONC
CONC
10
6
0.1
10
10
6
75
Potassium Permanganate Aq
Potassium Sulfate Aq
Pyridine
Propane Gas
Resorcinol
Salicylic Acid
Silicone Fluids
Silver Nitrate
Soap Solutions
Sodium Acetate Aq
Sodium Bromide Aq
Sodium Carbonate Aq
Sodium Chloride Aq
Sodium Hydroxide Aq
Sodium Hypochlorite
Sodium Nitrate Aq
Sodium Silicate
Sodium Sulfate Aq
Sodium Thiosulfate Aq
Stannic Sulfate Aq
Steam
Stearic Acid
Styrene (Monomer)
Sulfur
Sulfuric Acid Aq
Tallow
Tar
Tartaric Acid Aq
Tetrahydrofuran
Tetralin
Thionyl Chloride
Toluene
Transformer Oil
Trichloroethylene
Triethanolamine
Trisodium Phosphate Aq
Urea
Vaseline
Vegetable Oils
Vinyl Chloride
Water
Wax (Molten)
White Spirit
Wines & Spirits
Xylene
Zinc Chloride Aq
Zinc Oxide
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1
CONC
60
10
20
10
10
50
15
50
90
10
10
2
5
10
95
10
Devlon® V-API
CHEMICAL
CONCENTRATION
WEIGHT %
Devlon® V-API
CHEMICAL
CONCENTRATION
WEIGHT %
CHEMICAL
Devlon® V-API
CONCENTRATION
WEIGHT %
Devlon® V-API technical data
C
A
A
A
D
A
A
A
A
B
A
A
A
A
B
C
A
A
A
A
C
D
A
A
A
C
D
A
B
B
A
A
C
A
A
B
A
B
A
A
A
A
A
A
A
B
A
B
A
4
Devlon® V-API valve seats
Pressure / temperature performance comparison
6500
(448)
Extensive testing carried out at the
University of Leeds in the UK and by
leading global valve OEMs, compared the
performance of Devlon® V-API against a
range of the most common thermoplastic
materials used in valve seat applications.
6000
(414)
®
lon
Dev
4000
(276)
™
EK
PE
I
P
V-A
Differential Pressure
PSI/(Bar)
Nylon 6
5000
(345)
3000
(207)
Devlon® V-API offers
better performance
2000
(138)
FE
PT
than standard
1000
(69)
polyamides or PTFE
and is significantly
0
0
(-18)
100
(38)
200
(93)
300
(149)
400
(205)
500
(260)
600
(316)
Temperature
˚F /(°C)
more cost-effective
than PEEK™
The benefits of Devlon® V-API
• Superior pressure / temperature
operating range in comparison to PTFE
or Nylon 6
• Total assurance of product quality
and traceability with Positive Material
Identification Technology
• Available in diameters from 1/2” (12mm)
to 77” (1950mm)
• Proven in operation up to a pressure of
414bar (6000psi), subject to valve and
seat design
• Available in billet form or as semifinished or fully machined valve seats
• Excellent ‘machineability’ allows
creation of desired surface finish
•S
uperior dimensional stability over
PTFE in high pressure applications
•L
ower frictional losses than PEEK™
(trademark of Victrex plc) products
•E
xceptional resistance to wear and
abrasion
• Proven in operation from -50°C (-58°F)
to +176°C (+350°F), subject to valve
and seat design
•S
ufficiently conformable to seal in low
pressure valve applications
• Low moisture absorption level
enhances dimensional stability
•E
xcellent life performance in soft
valve seat application
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Information given in this publication is given in good faith and represents the results of specific individual tests carried out by James Walker or third parties in accordance with the
methodologies described in this publication, performed in a laboratory. No representation or warranty is given in relation to such information. Values and/or operating limits given
in this publication are not an indication that these values and/or operating limits can be applied simultaneously. While such results may comprise useful additional information
and are industry standard tests, they are no substitute for conducting (or procuring from James Walker) your own tests and engineering analysis and satisfying yourself as to
the suitability of the product you select. Please also note that a product tested in accordance with the published methodology may not perform to such values in application
and/or under different test conditions or methodologies for a variety of reasons, including but not limited to the environment in which it is used/tested or which passes through it
or otherwise affects the product, or due to the handling, storage or installation, or due to the effect of housing or other parts. Our personnel will be happy to discuss any historical
examples we have of a product having been previously used in a particular application.
To ensure you are working with the very latest product specifications, please consult the relevant section of the James Walker website: www.jameswalker.biz.
James Walker Sealing Products & Services Ltd
Registered Office: Lion House, Oriental Road,
Woking, Surrey GU22 8AP, United Kingdom.
Reg no: 00264191 England
Issue number 3
© James Walker 2020
JW4828 0720/PDF