Diaphragm Seal Elements
Mansfield & Green brand diaphragm seals are constructed
of materials suitable for all types of applications and
process media. Utmost care should be exercised when
specifying to insure material compatibility with your specific
requirement.
Tantalum-clad stainless steel is available in flange attached
seal elements only. 304L and 316L stainless steel
is used in all seals that are welded in the field. Other
materials are available on special request.
Mansfield & Green diaphragm seals can be equipped
with an AMETEK USG gauge or furnished for an application
with any brand and model pressure transmitter or
pressure switch.
Materials
Mansfield & Green diaphragm seals are available in a
wide variety of materials so that you can select the optimum
seal element that is compatible with your specific
process requirement.
Diaphragm
Diaphragm seals utilize a thin, highly compliant or flexible
diaphragm between the process medium and the
pressure containing internals of the pressure instrument.
These diaphragm materials are compatible with the process
media and include the following materials: 304L
SST; 316L SST; Hastelloy C276, C22 or B; Inconel 600 or
625; Monel 400; Kalrez 1050; Neoprene; Tantalum; TEFLON;
Titanium; Viton; and many others. Please contact
your distributor or USG customer service for more information
at usg.sales@ametek.com or +1 215-293-4100.
Upper Housing
The standard upper housing material for Mansfield &
Green diaphragm seals is carbon steel, zinc-plated for
better corrosion resistance. Optional 316L stainless steel
and other materials are also available, such as MONEL,
Hastelloy, Titanium, etc.
Lower Housing
Selection of the correct lower housing material is especially
important since this part of the seal is directly
exposed to the process media. As a general rule, materials
chosen are normally of the same type as used in the
remainder of the piping system.
Lower housing material options include:
Carbon Steel
304L Stainless Steel
316L Stainless Steel
HASTELLOY B
HASTELLOY C
Titanium
Carpenter 20 Stainless
MONEL 400
Nickel 200
Inconel 600
Inconel 625
PVC
Polyproprylene
TEFLON
Zirconium
Gaskets
Type R Series removable metal diaphragms are selfgasketed
by means of a TEFLON coating. No separate
gasket is required.
Standard Type S Series seals incorporate gasket material
of non-asbestos aramid fiber. Glass-filled TEFLON
and TEFLON-coated stainless steel gaskets are also
available for Type S Series. Other materials are available
on special request.
Type SMJ and SNJ Series
These seal elements are used in applications where there
is a jacketed pipeline and where heated or cooled processes
are involved. The Type SMJ conforms to Schedule
40 process pipe rating (other schedules available).
Type SNJ seals meet ANSI flange pressure/temperature
ratings.
Fasteners
Mansfield & Green furnishes bolts and nuts with all
thread-attached and In-Line Flow Thru seal elements.
Standard bolt material is high-temperature alloy steel,
Grade 41 BV 35 or equal, 105,000 psi minimum yield
strength at 650°F (343°C); 316L stainless steel and other
materials are available upon special request. Nuts are
supplied in Type 18 stainless steel as standard. Other
materials are available upon special request. AMETEK
also supplies studs where required.
The customer supplies bolts and nuts for all flange attached
seals. All seals with TEFLON gaskets or diaphragms
should be torqued to 10 ft. lbs., aramid and
elastomer gaskets to 20-25 ft. lbs., and metal gaskets to
40-45 ft. lbs. All bolts should be lubricated prior to installation.
Fill Fluids
Specifiers should exercise extreme care in the selection
of the proper fill fluid for specific applications since fill
fluids may react chemically with process fluids and other
materials. Compatibility of the selected fill fluid is the responsibility
of the customer. Typical fill fluids are listed in
this catalog and our distributor price book.