 Firesafe
Certified to API 607 4th edition BS6755 Part 2 and API
6FA.
Zero leakage - Bi-directional shut-off
with Zero Leakage
Capability.
- Ease of maintenance
Field replaceable seat and seal ring reduces
maintenance costs.
- Ease of material selection
Non-galling design enables a wide variety
of material options.
- Bearing protectors
Bearing protectors are available for the
more arduous duties or may be fitted
as standard.
- Live loaded packing
'available on request'
- Quality assurance system
Approved by Lloyds to ISO 9001.
- Pressure ratings
ANSI 150 through 2500 lb.
- Triple offset geometry
Provides non-rubbing motion throughout
full 90° rotation
eliminating unneccessary wear and prolongs
life of seat and seal.
- Anti-blowout stem
Fitted as standard to API 609 cat B.
- Body styles available
Wafer flangeless, Wafer lugged, Double
Flanged (short and long patterns),
and Butt Weld.
- Sizes
3 inches to 84 inches.
SOLENT & PRATT,
TOSV series valves are of dedicated Triple Offset * geometry
design. This particular feature eliminates the disc-to-seat
rubbing condition, normally associated with 'HPBV' butterfly
valves, which induces wear of varying degrees, even in
metal seated versions.
The offsetting of the shaft in two axis, when combined
with the tilting cone / ellipsoidal segment means that
there is complete removal of 'scuffing' and surface pick-up
during the full 90 degree movement. The seal ring, which
is of laminated construction (St.St. / Graphite sandwich)
uses the seat ring as the stopping point, thereby eliminating
separate mechanical stops. There is no need for critical
settings for disc-to-seat contact to achieve required
shut-off. This is of particular benefit in situations
where actuators and controls are fitted.
When closed, the seat is bi-directionally tight, with
leakage rate of 'zero', in either direction. The seat
sealing load is torque induced, thus when the disc movement
reverses to 'open', the operating torque quickly reduces,
due to the on / off contact action of seal to seat and
swing clear action via shaft offsets. Since the seal
action is 'contact' without any 'rubbing' action, then
'galling' does not occur and so the same material can
be used for both seal and seat.
These foregoing features are of benefit in applications
where process operations involve 'high cycling'.
The trims are all fully rated in pressure ranges from
150 lb to 1500 lb, making it an ideal PROCESS VALVE which
is inherently FIRESAFE, having no soft components in
it's construction.
To summarise, this is an ideal replacement valve for
Ball, Plug or Gate types, since it offers:
Seat tightness - Zero leakage Non - jamming seat design
Control & Isolation use Weight savings
Inherently cavity free Easily maintained **
* A Double Block & Bleed
version is available
** Both Seat and Seal are field replaceable
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