Transcript Welcome to PBM Training School

Objectives

Self-Flushing Ball
Show how PBM is different from
“Floating” ball valves.
Show how PBM’s self-flushing
ball combined with PBM’s exclusive
up and downstream sealing can be
used to effectively clean a ball valve

Testing and
Information
Show
why PBM ball valves can be
used in high purity applications.
Ball Valve Design Types
• Floating ball traditional
design
– Relies on upstream line
pressure from the media to
seat the ball against the
downstream seat
– Not suitable in low
pressure applications, such
as vessels, tanks, and
reactors
– May add considerable
“dead space” in tank
bottom applications
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PBM Adjust-O-Seal® Design...
• Is NOT a trunnion ball design
• Does NOT rely on upstream
pressure to seal
• Does NOT secure the ball
against seats with springs
• Has the Adjust-O-Seal® design
to maintain pressure securing
the ball against the seats
• Seals independently on both
the upstream and downstream
seats
new_aos
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CIP/SIP Options
Flush Tank
Two-Way
Milled ball flats
SK-98011
Location of purge ports is
critical -- condensate drain
must always be at the
lowest possible point.
Ball purge holes
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Dual Chamber Concept
• Adjust-O-Seal creates a “dual chamber” that allows cleaning or
steaming of valve internals while providing complete isolation
from the process -- when the valve is in the full closed or full
open position.

One of PBM’s best kept secrets.

Process media can flow through the ball.

Cleaning media can flow around the ball.
 Allows
body cavity options to minimize
problems with trapped fluid in the
valve body that could contaminate
the process or prevent smooth
operation of the valve in sanitary
and other applications.
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PBM Adjust-O-Seal® Design (cont.)
• Both low and high pressure applications
– Excellent for vacuum service
• Multiple adjustments result in longer seat life
• Zero leakage
• Equal throughout complete pressure range
• No product entrapment behind seats
• No direct leak path past body gaskets
• Body cavity options
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Body Cavity Fillers
•
•
•
•
SK-98008
Cavity Fillers
•
PBM was first to introduce, others
have copied
Made of machined Virgin
Polytetrafluoroethylene (VTFE)
(other filler materials are available).
Designed to fill the cavity of the
valve between the body and the ball
-- whatever is in the ball stays in the
ball.
Minimize problems with trapped fluid
in the valve body that could
contaminate the process or prevent
smooth operation of the valve.
Required in some applications for
USDA compliance.
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Bottom Entry Stem & Live-Loaded Seal
• Machined Teflon stem packings;
two on the top, and one on the
bottom
– Mechanically loaded (“liveloaded”) with Belleville spring
washers
• Washers compensate for normal
wear by providing a constant load
on the stem seal, creating the
memory that Teflon seals don’t
have.
• Eliminates need for frequent
adjustments required of a packing
gland style.
• If necessary, PBM’s stem seal load
can be adjusted without replacing
the seals. This reduces wear
characteristics, and increases
cycle life.
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Metal Materials
• PBM offers the following materials of composition:
–
–
–
–
–
–
–
–
–
–
–
–
Alloy 20
Aluminum, Aluminum Alloys
Aluminum Bronze - 953, 955
Bronze - 836, 922, 932, 954, 955
Others may be available
upon request..
Carbon Steel
Hastelloy - B-2, C-22, C-276
Inconel
Iron
Monel
Nickel, Nickel Al Bronze, Nickel 200
Stainless Steel - Duplex, AL6XN®, 304, 304L, 316, 316L, 317, 317L
Titanium - Grade 2, Grade 5
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Seat and Seal Materials
Designation
UHMWPE
KYNAR®
VTFE
RTFE
Description
Ultra High Molecular Weight
Polyethylene
Color
Glossy
Off White
Slightly
Transparent White
Polyvinylidene Fluoride
Virgin PTFE
PBM standard for Igenix® Sanitary Bright White
Valves and all cavity fillers
Glass Reinforced PTFE
PBM standard for seats, seals and
Slightly Off White
stem packing, except Igenix® valves
S/STFE
Stainless Steel Reinforced PTFE
Dark Gray
TFM®
Chemically Modified PTFE
Bright White
PEEK
Polyetheretherketone
Carbon Graphite encapsulated in
316L S/S Ring
Putty
CARBON
Black
Notes:
1. PTFE is polytetrafluorethylene.
2. With the exception of PEEK and Kynar, all seating materials meet the Class VI seat leakage criterion of ANSI/FCI 70-2 and the zero leakage criterion of
MSS SP-61. For PEEK and Kynar seats, the liquid criterion of Class V and ANSI/FCI 70-2 applies. (PEEK seats are normally not tested with air.)
3. Seat and seal materials may be mixed in a valve in order to provide media-compatibility and the appropriate torque, temperature and pressure ratings.
Self-Flushing Ball
• PBM self-flushing balls join the cavity
of the valve with the piping when
the valve is open. The holes allow
product to fill the cavity just as it fills
the piping. When flushing the lines,
the cleaning fluid fills the cavity and
displaces the product.
• No features are sacrificed when selfflushing balls are used. The valves
remain double-seated and seal in
either direction when closed.
• Also available in diverter port and
multi-port valves.
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Surface finish of the
PBM sanitary valve body
cavity is 20 RA (180 grit)
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Bottom of flushable ball exposing body cavity in open position
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Downstream side of ball
Conventional ball
(sealing area)
Sanitary flushable
ball with milled flats
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Milled flats allow body cavity to drain in the closed position
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P&G sanitary ball in closed position – draining cavity to downstream
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Testing
PBM Procedure 0904-2: Flushing
Tests of Liquid Through a
2-Inch Valve with TFM® seats and a
Self-Flushing Ball
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Testing cont.
Test Valve
The test valve is PBM assembly SIHLH5X-G-8- - -A. It is a 2-inch valve with sanitary clamp ends,
®
TFM seats, and a self-flushing ball (part SIHLH508SF). The bore through the valve is 1.87-inches
with no contractions or expansions.
Flushing Procedure
Heat the hot water test facility to 170° to 180°F with a slave valve installed in lieu of the test
valve.
Blank off one end of the test valve and position the axis of the valve vertically.
With the valve open fill it with product.
Cycle the valve 5 times then drain product out. Do not drain the bottom of the body. The valve
should be horizontal during draining.
Secure flow in the test facility and valve out and remove the slave valve and install the test valve
in the open position.
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Testing cont.
Valve in the test valve and initiate flow of about 40 to 43 gpm (about 5 fps) through the test valve.
Do not cycle the test valve while flushing.
After 30 minutes has elapsed, secure the pump and remove the test valve.
Disassemble the test valve and inspect for evidence of product. Take photographs as needed.
Flush product from the test facility by performing fill and drains then repeat these steps for
additional product flushes.
Product
Liquid detergent (dark blue in color) and liquid fabric softener (light blue in color).
Results
The table below provides the results of the flushes. Flush numbers designated with a “D” are liquid
fabric softener flushes and flushes numbers designated with a “T” are liquid detergent flushes. The
last two runs were made using a standard ball, one run with fabric softener and one run with liquid
detergent.
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Testing cont.
1D
Self-flush
2D
Self-flush
3D
Self-flush
1T*
Self-flush
2T*
Self-flush
3T*
Self-flush
1D Standard Standaed
1T Standard* Standaed
30 min
30 min
30 min
30 min
30 min
30 min
30 min
30 min
174-180F
174-180F
174-180F
174-180F
174-180F
174-180F
174-180F
174-180F
43 gpm
42 gpm
41 gpm
41 gpm
41 gpm
42 gpm
43 gpm
42 gpm
Clean
Clean
Clean
Some bubbles**
Clean
Clean
Cavity filled with fabric softener
Cavity filled with liquid detergent
* Bled and fed water during flush because of high bubble concentration in
water. Bubbles reduced on flush 1T, but not eliminated. On 2T and 3T
bubbles nearly eliminated.
** Bubbles in flush water and on all surfaces which rapidly disappeared with
time.
See photograph below.
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Testing cont.
As evidenced by the photographs, the flushes with the self-flushing ball cleaned the valve
extremely well, regardless of product, as evidenced by the absence of the light blue fabric
softener or darker blue liquid detergent. The flushes with a standard ball did not clean up with
either product. When the end fitting bolting was loosened the product ran out of the cavity (see
photographs). The standard ball was not expected to clean up but was tested for comparative
purposes.
Conclusions
The self-flushing ball is extremely effective in cleaning the valve using the products tested and
for the time, temperature, and velocity tested (5 fps). The final two runs show what the
internals’ appearance if a standard ball is used.
Prepared by,
K. R. Graham
Project Engineer
PBM, Inc.
September 10, 2004
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Test Facility
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