Apollo Valves, Apollo Valve, Apollo Ball Valves
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Apollo Ball Valves (Top Entry - Seat Performance Data)
#1 (PTFE)
( Figure 1)
General application seat material, exhibiting
lowest operating torque and excellent resistance to chemical
attack.
Most commonly specified seat material, and used
as the basis for published torque values. Maintains the excellent
chemical resistance of unfilled Teflon (PTFE) with increased
resistance to wear and abrasion resulting in longer life.
Features a metallic inner ring to improve abrasion
resistance, particularly in high solids or throttling applications.
Maintains the other features of the #2 seat.
This seat design has been successfully tested
to the requirements of API 607, fourth edition. The PTFE seat
is fully confined by a metallic seat holder which provides a
secondary seal in the event of the loss of the primary PTFE
seal due to a fire. As the seat seal material is PTFE, chemical
and torque characteristics will be the same as in the #1 seats.
This seat design has been successfully tested
to the requirements of API 607, fourth edition. The RPTFE seat
is fully confined by a metallic seat holder which provides a
secondary seal in the event of the loss of the primary RPTFE
seal due to a fire. The seat holder can perform the same function
as the inner ring found in the #3 and #5 seats making this design
appropriate for abrasive and throttling applications. As the
seat seal material is RPTFE, chemical and torque characteristics
will be the same as in the #2 and #3 seats.
This seat is specifically intended for steam applications.
Also applicable to abrasive and throttling applications because
of the heavy loading of reinforcing materials and the presence
of the inner ring. However, chemical compatibility may be a
limiting factor in the application of this seat.
This seat material has increased abrasive and
throttling resistance due to the heavy loading of reinforcing
materials and the completely confined seat.
Ultra High Molecular Weight Polyethylene offers
good abrasion resistance making it suitable for use in high
solids or slurry applications. These seats are completely
confined by a metallic seatholder enhancing their performance
in abrasive services. This seat is frequently specified in services
where fluorine off-gasing in even the slightest amounts is objectionable.
Examples of these services are food, tobacco processing and
nuclear services.
Exhibits the same characteristics as the #6 seat
with the exception that it utilizes the inner seat ring to enhance
performance in abrasive services. UHMWPE should be used with
caution in the presence of solvents, and the operating torque
can be expected to be 30% higher than that of the Teflon based
seat materials.
PEEK (PolyEtherEtherKetone) offers a high strength
alternative to RPTFE, resistant to creep and cold flow. This
seat offers good abrasion resistance. Higher in cost, this material
offers similar chemical resistance to PTFE but should be checked
by application. Operating torque tend to be 40% higher than
RPTFE. Ball stop recommended.
Carbon Reinforced PEEK provides improved abrasion
resistance when compared to the unfilled variety. This material
offers a broader temperature range than RPTFE with similar chemical
resistance but should be checked on application. Operating torque
tends to be 40% higher than RPTFE. Ball stop recommended.
Designed for high temperature applications. A
ball stop is required in applications above 500°F. Maximum
service temperature is limited to 750°F in oxidizing applications.
This seat, like all rigid seat materials, does not necessarily
provide "bubble tight" shutoff. Most test standards
have allowable leakage rates or list "classes" of
shutoff for this type of seat. Be aware of the system design
requirements when specifying this or any rigid seat. Ball stop
recommended.
Designed for very high temperature applications.
A ball stop is required in applications above 500°F. Maximum
service temperature is limited to 1000°F. This seat, like
other rigid seat materials, does not provide "bubble tight"
shutoff. This seat is not as abrasion resistant as the #4 version.
Be aware of the system design requirements when specifying this
or any rigid seat. Ball stop recommended.
Working in conjunction with a ceramic ball, this
seat out-performs all other materials in throttling and abrasive
applications. It possesses excellent chemical resistance. Cost
is very high, and unless experience dictates its use, other
alternatives should be evaluated first. A ball stop is recommended
for all applications. This seat, like all rigid seat materials,
does not necessarily provide "bubble tight" shutoff.
Most test standards have allowable leakage rates or list classes
of shutoff for this type of seat. Be aware of the system design
requirements when specifying this or any rigid seat.