Metal
Jacketed Gasket(Double Jacketed Gasket)
Item No.:ZD-G2020
Description:Metal jacketed gaskets comprise of a thin metallic outer shell enclosing
a resilient filler material. The gaskets metal case protects the
resilient filler and is resistant to pressure, temperature and corrosion.Metal jacketed gaskets are hand made and are available in many
shapes and sizes with a selection of metals and fillers available.
Internal ribs of any configuration are available.These gaskets are
widely used in heat exchanger applications but require good and even
flange surfaces along with high bolt loads to effect a seal.
Single
jacketed gaskets have one surface and both OD and ID covered by the
metal jacket. Suitable for narrow flange widths in low pressure valve /
pump applications
Double jacketed gaskets are completely enclosed
by a two piece metal jacket covering OD, ID and both sealing surfaces.
Widely used in heat exchanger applications and suitable for corrosive
and high temperature service.
Internal ribs (pass partition bars) can be
integral or welded welded as in both types, the primary seal is safely
maintained.
Application:
those with simple shapes are applied in pipeline
flange and sealing surface of internal-combustion machines, and those
with complicated shapes are used in the flange cover of heat exchanger,
etc. The general gaskets are 10-25 MM wide and 2MM-8MM thick, and can be
used in a maximum work pressure of 6-10Mpa.
Definition:
the cladding materials are different metal panels
of 0.1MM－0.5MM thick, and the internal cladding materials are made of
non-metal materials.
Filler
Material: Normally graphite,PTFE, ceramic
and non asbestos are also available.
Jacketed Material：Tin-plate、SS304、316、Copper、aluminum,ect.
Types:
|
Types of sealing gasket
|
Applied in |
|
Metal fully-cladding gasket
|
Vacuum sealing position, tower
groove flange, valve cover, etc, automobile dynamo |
|
wave-shaped fully-cladding
gasket |
High-temperature pipeline,
valve, exhaust pipelines, etc. |
|
wave-shaped semi-cladding
gasket |
Ignition tower flange, manhole,
hand hole, pipeline flange, etc |
|
Round fully-cladding gasket
|
Manhole, hand hole,
internal-combustion engine, etc. |
|
Metal double-layer
fully-cladding gasket |
High-temperature and
high-pressure flange, container flange |
|
Metal U-shaped cladding gasket
|
Pipeline flange, valve etc
|
|
Metal cone-shaped cladding
gasket |
Cone parts of air blower
|
Choosing metal
sheet:
|
materials |
maximum temperature (℃) |
remarks |
|
blue asbestos plate
|
350 |
With over 90% asbestos fiber
(blue asbestos) |
|
asbestos plate (thread, rope,
cloth) |
500 |
With over 90% asbestos fiber
(chrysotile asbestos) |
|
asbestos rubber plate |
450 |
High-temperature asbestos
rubber plate |
|
expansion graphite
|
500( oxygen environment ) |
Non-oxygen environment of
over800℃ |
|
porcelain fiber plate
|
1750 |
--- |
|
PTFE plate |
260 |
--- |
Wave-shaped
fully-cladding gasket: (mm)
Characteristics: good elasticity, applicable to the
sealing positions of low preloaded force, and mainly used in the valves,
pressure containers, and tower apparatus, etc of petroleum refining and
chemistry devices.
|
gasket width （W）
outer diameter range（D） |
gradient range（P）
|
thickness（T）
|
|
Below 100 |
3 |
3 |
3 |
-- |
|
|
100￣160 |
3 |
4.5 |
4.5 |
4.5 |
3 |
|
160￣250 |
4.5 |
4.5 |
4.5 |
6.5 |
3 |
|
250￣400 |
4.5 |
4.5 |
4.5 |
6.5 |
3 |
|
400—630 |
4.5 |
6.5 |
6.5 |
6.5 |
3 |
|
630—1000 |
4.5 |
6.5 |
6.5 |
6.5 |
3 |
|
1000--1600 |
-- |
6.5 |
6.5 |
6.5 |
3 |
Pressure （y,Mpa）gasket coeficient table (m) of
wave-shaped gasket of different kinds
|
types
|
metal types
|
gasket coefficient (m)
|
pressure （y）Mpa |
|
Metal wave-shaped and
asbestos line gasket |
aluminum alloy
|
2.5 |
20 |
|
copper and brass copper
|
2.8 |
30 |
|
soft steel |
3.0 |
35 |
|
Monel alloy
|
3.3 |
40 |
|
Nickel alloy
|
3.3 |
40 |
|
Stainless steel
|
3.5 |
50 |
|
Metal fully-cladding
sealing gasket |
aluminum |
2.5 |
20 |
|
Red copper, brass
copper |
2.8 |
30 |
|
soft steel |
3.0 |
35 |
|
5Cr--1/2Mo steel
|
3.3 |
40 |
|
stainless steel
|
3.5 |
50 |
|
Metal U-shaped cladding
gasket (wave-shaped cladding) (full cladding)
(semi-cladding) |
aluminum |
3.3 |
40 |
|
Red copper, brass
copper |
3.5 |
50 |
|
soft steel
|
2.8 |
55 |
|
5Cr--1/2Mo steel
|
3.8 |
65 |
|
stainless steel
|
3.8 |
65 |
|
Monel alloy
|
3.5 |
60 |
|
Metal round cladding
sealing gasket |
aluminum |
3.3 |
40 |
|
Red copper, brass
copper |
3.5 |
45 |
|
soft steel
|
3.8 |
55 |
|
5Cr--1/2Mo steel
|
3.8 |
65 |
|
stainless steel
|
3.8 |
65 |
|
Monel alloy
|
3.5 |
60 |
|
Metal double-layer
cladding sealing gasket |
aluminum |
4.3 |
50 |
|
Red copper, brass
copper |
4.5 |
55 |
|
soft steel
|
4.8 |
65 |
|
5Cr--1/2Mo steel
|
4.8 |
80 |
|
stainless steel
|
4.8 |
80 |
|
Monel alloy
|
4.5 |
70 |
|
Install of ZD-G2020:
Main Style Of Metal Jacketed Gasket：
|
Product
Code |
Cross Section |
|
ZD-G2021
|
 |
|
ZD-G2022 |
 |
|
ZD-G2023 |
 |
|
ZD-G2024 |
 |
Main Specification of Metal Jacketed Gasket：
|
Pressure |
=<6.4MPa |
|
Temperature |
-196℃-700℃(Oxidating=<450℃) |
|
Gasket Factor |
m=3.75 |
|
Minimum Pre-tighten |
y=60MPa |
Warning: Gasket materials should
never be recommended when both the
temperature and the pressure are at
the maximums listed. Properties and
applications shown are typical. No
application should be undertaken by
anyone without independent study and
evaluation for suitability. Never
use more than one gasket in one
flange joint, and never reuse a
gasket. Improper use or gasket
selection could cause property
damage and/or serious personal
injury. The data reported is a
compilation of field testing, field
service reports and/or in-house
testing. While the utmost care has
gone into publishing the information
contained herein, we assume no
responsibility for errors. The
information and specifications
contained in this website are
subject to change without notice.
This revision cancels and obsoletes
all previous editions.
