4. Why FM Piston Valve?
• FM PISTON VALVES have a Low System
Failure Vulnerability – Makes System Robust
& Healthy increasing System Efficiency.
• Each PISTON VALVE is designed, sized,
selected and tested in house giving quality
control to each component to Spirax
standards.
• FM PISTON VALVE is a glandless
and seat less valve. At the heart of
piston valve is a piston and sealing
rings.
• The Piston is burnished, having
excellent surface finishing (0.2 to 0.6
M Ra ) & dimensional control. It
ensures no damage is caused on the
sealing rings while getting press fitted
during operation and makes a perfect
seal against the metal reinforced
graphite rings in order to achieve leak
proof shut off and this unique design
ensures long life even at high
temperatures – up to 425 o C.
• FM PISTON VALVES have Large
Sealing Area between Sealing Rings &
Piston ensures proper grip and
avoids leakage.
• FM PISTON VALVES have a Lower Cost of
Ownership - Higher input cost and negligible
Maintenance cost.
• FM PISTON VALVES have a Long Tenure – Fit
& Forget Valve, Long Term Services guaranteed.
• FM PISTON VALVE are in house engineered
using our proprietary sizing software and
factory assembled unit.
5. • In case of FM PISTON VALVE, as the piston is not exposed to the media the
durability and the life increases.
• Forbes Marshall manufactures all components in house - nothing is outsourced.
• FM PISTON VALVES are self cleaning and self lubricating.
• In case of FM PISTON VALVE only one type of sealing ring is required for upper &
lower side . This eliminates human error in assembly. This helps in keeping
minimum inventory of spares.
• The PISTON VALVE is tailor made to customers’ specified process parameters.
Why FM Piston Valve?
• Each PISTON VALVE is tested on live steam and the entire assembly is hydro
tested 1.5 times.
• PISTON VALVES are manufactured by experts and all components are of the best
quality.
6. Piston
FM Piston Valve
• Piston is burnished
one, having excellent
surface finishing (0.2
to 0.6 M Ra ) &
dimensional control,
ensures no damage
on the sealing rings
while getting press
fitted during operation.
• This enables leak
proof isolation , shut
off class - VI i.e.
Bubble tight shut off.
Conventional
Piston Valve
• Piston is grinded one
(Surface Roughness
of the same is in the
range of 0.4 to 3.2
M Ra) , minute
surface protrusions
may damage the
sealing ring while
getting press fitted
during operation.
• Due to this, it fails to
ensure leak proof
isolation over a
period of time.
7. Piston & Spindle Assembly
FM Piston Valve
• Inner surface of the
Valve body where
sealing rings are
fitted , is also
burnished , this in
turn helps in perfect
sealing on the body.
Conventional Piston
Valve
• This portion is
machined as usual,
through which again
valve may leak.
8. FM Sealing Rings
FM Piston Valve
• SS reinforced
graphite
• Sealing rings have
unique feature of
softness &
compressive strength
to combat against
zero leakage up to
the temperature of
427 0 C
Conventional Piston
Valve
• PTFE is sandwiched
between Asbestos
in the upper sealing
ring and the lower
sealing is made of
Asbestos fully ,
which can withstand
up to 300 0C
temperature only.
• Above 300 0C , they
offer different
Sealing rings.
9. FM Sealing Rings
FM Piston Valve
• Only one type of
Sealing Ring is
required for upper &
lower side . This
eliminates human
error in assembly.
• This helps in
keeping minimum
inventory of spares.
Conventional Piston
Valve
• Upper & lower
sealing rings are
different , means
the user has to take
care about the
sealing rings
positions while
replacing.
• Comparatively , it
makes to have
more inventory of
spares.
10. Low Pressure Drop With Higher
Piston Sealing Area
FM Piston Valve
• Effective sealing
area is higher. E.g.
for 15 NB valve, the
sealing area is 603
mm 2
(Sealing ring
D=16mm, H=12 mm)
• Higher the opening
area (sealing area),
lesser is the pressure
drop.
Conventional Piston
Valve
• Effective sealing area
is lower than FM PV.
E.g. for 15 NB valve,
the sealing area is
495 mm 2
(Sealing ring
D=15mm, H=10.5mm)
11. Live Testing
FM Piston Valve
• Each PISTON
VALVE is tested on
live steam and the
entire assembly is
hydro tested 1.5
times.
Conventional Piston
Valve
• Each PISTON
VALVE is only
hydrotested but not
on live steam.
13. 13
• Balanced Piston & Back seat
arrangement for Sizes 80 NB
& above , this ensures lesser
manual torque required to
operate the valve.
FM Piston Valve
Only Balanced Piston Valves
from FM
15. Energy
• FM PISTON VALVES have Large Sealing
Area between Sealing Rings & Piston result
of which CLASS Vl 100% Tight Shut Off
Guaranteed and thus wastage of the media
is eliminated.
• Based on the process parameter received
from the client tailor made PISTON
VALVE is made suiting his parameter and
not providing the customer standard size
PISTON VALVE.
Energy
16. Environment
• FM PISTON VALVE is a glandless and
seat less valve. At the heart of piston
valve is a piston and sealing rings. The
burnished piston makes a perfect seal
against the metal reinforced graphite
rings in order to achieve leak proof shut
off and this unique design ensures long
life even at high temperatures – up to
425 oC.
Environment
17. Safety
Safety Norms
• Each PISTON VALVE is tested on live
steam and the entire assembly is hydro
tested 1.5 times.
• PISTON VALVE are fabricated by
experts and all the components are of
best quality.
18. Ease of Operation
• FM PISTON VALVES are self
cleaning and self lubricating.
• Forbes Marshall manufactures all
the components in house nothing is
outsourced.
• In case of FM PISTON VALVE On---
Line Maintenance Possible, Valve
remains on-- line during Maintenance
making it less time consuming
• FM PISTON VALVES have a Low
System Failure Vulnerability – Makes
System Robust & Healthy increasing
System Efficiency.
Ease Of
Operation
19. Reliability of Resources
• The ownership of each the components of the
PISTON VALVE is under one roof which offers
smooth functioning.
• As nothing is outsourced and everything is
designed, tested and fabricated in-house which
would increase the reliability and credibility of
the PISTON VALVE.
• FM PISTON VALVES have a Long Tenure – Fit &
Forget Valve, Long Term Services guaranteed.
• FM PISTON VALVES have a Lower Cost of
Ownership - Higher input cost and negligible
Maintenance cost.
• In case of FM PISTON VALVE as the piston is
not exposed to the media the durability and the
life increases.
Reliability of
Resources
