Flow Control KTM Ball Valves - Valves and Controls

KTM Ball Valves
SB11 ASME Floating Ball Valve, Cost-Effective, Two-Piece Split Body
Stem Sealing
SealMaster
V-ring
Stem Packing
2
Belleville
Washers
Stem Sealing Details
1
3
B
Main Features of SealMaster
Patented Stem Seal Arrangement
•“Multiple” sealings up to 6 areas (see Views 1-6) for
pressure and high vacuum.
• Encapsulated “Static” sealing achieved on upper
tost seal.
• Constant sealing force reflects to stem (see arrows
“A”) and makes stem primary sealing “Positive.”
A
• Excellent wear resistance on lower tost seal (50% SS
filled PTFE), 1000 times greater than that of PTFE to
prolong the compensation of Belleville washers.
C
4
Copyright © 2009 Tyco Flow Control. All rights reserved. KTMMC-0550
12
6
5
Our extremely high cycle stem sealing design is accomplished
by a double sealing system. The high performance of KTM
ball valves is mainly due to the unique SealMaster stem seal
arrangement, which provides primary sealing. It has been
specially designed and constructed to prevent line fluid
permeation and resultant leakage. On top of this arrangement
are multiple layers of V-ring stem packing, which act as
secondary sealing. A set of Belleville washers automatically
and constantly compresses the seals to adjust for wear,
pressure and temperature fluctuations. Every KTM ball valve
is a stalwart barrier against fugitive emissions.
View 1 View 2 View 3
View 4 View 5 View 6
The live-loaded SealMaster is a combination of three
components: (A) a cup and cone PFA/TFE upper tost seal;
(B) a cup and cone sintered stainless steel 316 center load ring,
and (C) a flat stainless steel/TFE lower tost seal. When tightened,
the live loaded stem pulls up, compressing the stem tost seal.
As this happens, material from upper and lower tost seal
extrudes between stem and body enclosures (see Views 1-6).
The surfaces between the bottom of the lower tost seal and top
of the stem flange are smooth and all rotation occurs between
these two surfaces, leaving the stem tost seal “static” to create
the best possible seal. As rotation continues, components bed in
and keep seal performance constant with usage. As operating
wear takes place, the stem tost seal can be re-tightened to
recommended torques multiple times.