SkoFlo Industries SF15000NMFB Manual

protected
Pressure Independent
Flow Controller
SkoFlo Valve Model SF15000NMFB
OPERATION AND MAINTENANCE INSTRUCTIONS
2/13/2003

protected
SkoFlo Valve Model SF15000NMFB
OPERATION AND MAINTENANCE INSTRUCTIONS
INSTALLATION PROCEDURES:
1. Install valve so that the flow is in the proper direction. The "IN"
connection and the "OUT" connection are MP20000 connections
for 3/4" tubing, and are marked respectively.
2. Install an inline filter in the system. Generally, this is located upstream
of the pump. Clean chemical and proper filtering is very important.
A 200 micron size filter is recommended.
START UP PROCEDURES:
1. Open the supply isolation valve to the flow controllerslowly.
2. Turn the rate adjustment handle until you are at the desired flow rate
3. The flow controller is now set and further adjustments are not required.
r:\msoffice\excel\e-mail\o_manuals\SkoFlo sf15000nmfa\sf15000nmfa-manual-a1 Page 2 of 13

PRINCIPLE OF OPERATION
The SkoFlo valve is a pressure
independent flow control valve used in
the petroleum industry to accurately injec
t
chemicals. The valve consists of a body,
a
b
ase plate that is bolted to the body, and a
flow rate adjustment handle.
The principle of operation of the Model
SF15000NMF SkoFlo valve is that it
internally maintains a constant differential
pressure across an adjustable Cv section,
thus resulting in a constant flow through
that Cv section. The piston/spring
assembly utilizes system pressure to
adjust the internal pin and seat Cv section
,
which then sets a constant differential
pressure across the adjustable Cv section,
thus maintaining a constant flow. Flow
rate changes through the valve can only
be made by adjusting the rate adjustment
handle.
Fluid enters the valve inlet at pressure P
1and flows into chamber 1. It then flows through the
adjustable Cv section into chamber 2 where the piston and springs are located. These springs
put a force against the piston based on how much the springs are deflected. The spring force
against the piston is set by the differential pressure between P
1in chamber 3 and P2in chamber
2. This pressure balance establishes the pressure P
2in chamber 2 at a fixed differential from P 1.
Flow then exits the valve at pressure P
3after passing through the seat. The flow through the
seat is held back by the pin that mates with the seat. As the pressure in chamber 2 changes,
either as a result of a change in P
1or a change in P3, the pin moves in relation to the seat and
controls pressure P2. As soon as equilibrium flow through the valve is established, the flow rate
will remain constant even when pressures upstream and/or downstream of the valve change.
Rate
Adjustment
Handle
Adjustable
Cv Section
P
1
P
3
P
2
IN
OUT
CHAMBER 2
P
2
CHAMBER 3
P
1
CHAMBER 1
P
1
Springs
Pin
Seat
Piston
Valve
r:\msoffice\excel\e-mail\o_manuals\SkoFlo sf15000nmfa\sf15000nmfa-manual-a1 Page 3 of 13

ADJUSTMENT AND CALIBRATION:
SF
3-WAY
VALVE
CHEMICAL INJECTION
CONTROL VALVE
CHEMICAL TO PROCESS
(AS AN EXAMPLE SAY
4200 PSIG / 289 BAR)
CHEMICAL TO CALIBRATION
BEAKER OR TO CALIBRATION
FLOW METER
(AS AN EXAMPLE SAY
50 PSIG / 4 BAR)
CHEMICAL
SUPPLY
(AS AN EXAMPLE
SAY 4500 PSIG / 310
BAR) - MUST BE AT
LEAST 200 PSI / 14
BAR HIGHER THAN
PRESSURE OF THE
CHEMICAL TO
PROCESS
The SkoFlo Valve is a pressure independent flow control valve. Once the valve is set at a desired
flow rate, that flow rate is maintained even though the pressure conditions upstream and/or
downstream of the valve may change considerably.
The standard Multi-Point SkoFlo valve is set by manually adjusting the rate adjustment handle.
When the desired flow rate is set, the valve needs no further adjustment, and the valve remains at
that fixed flow rate until the rate adjustment handle is turned to a new setting.
The flow rate can be set using a flow meter in the line to the process. However, a flow meter in thi
s
line must be capable of withstanding the process pressure. This normally limits the availability of
this type flow meter.
The most common method of calibrating the SkoFlo Valve is with a 3-way valve and a line to a
calibration beaker or to a low pressure flow meter. Once the flow rate is set, the 3-way valve is
switched to direct the chemical to the process.
Since the SkoFlo Valve flows at the set rate independent of the pressure differential across the
SkoFlo Valve, the flow rate to the process is the same as the flow rate set using the beaker or flow
meter. Overall monitoring of the flows is done by taking inventory of the usage from the supply
tank.
In the above example, the SkoFlo Valve is set with a differential pressure of 4450 psi / 306 bar
across the valve. The flow rate set will remain the same when the chemical is routed to process and
the SkoFlo Valve has a differential pressure of 300 psi / 21 bar. Note that the SkoFlo valve should
not be operated continuously at differential pressures above 3000 psi / 207 bar.
r:\msoffice\excel\e-mail\o_manuals\SkoFlo sf15000nmfa\sf15000nmfa-manual-a1 Page 4 of 13

OPERATION NOTES AND WARNINGS:
1. The SkoFlo valve has hard seats and is not designed to provide complete
"bubble-tight" shut off. Separate isolation valves should be used for
shutting off the flow. Overtightening the handle could cause damage to
the stem section. If flow rate does not decrease when turning the handle in, see
"Trouble Shooting Improper Valve Performance".
2. The model SF15000NMF valve should not be operated at flow rates below
0.2 gpm. Lower rates can cause excessive pressure drops in the stem section.
3. Operating valve with continuous differential pressures above 3000 psi / 207 bar
may cause premature internal wear and must be avoided.
4. The SkoFlo Valve is designed for flow in one direction only. Do not flow
backwards through the SkoFlo valve. Some internal seals are designed for one
direction only and could possibly become dislodged. The valve will not control
flow in the reverse direction. Flow Control Industries recommends installation
of a check valve in the outlet line from the SkoFlo valve (see "Multi-Point System
Sample Schematic") to avoid reverse flow of process fluids into the chemical system.
5. When lifting the SkoFlo valve, lift from the base. Do not lift using the
handle as this can damage the handle.
MAINTENANCE:
1. Replacing Seals: When replacing valve seals, it is
recommended that the Piston Seal Installer Tool
(P/N SF15000N-T1) be used.
A. Remove SkoFlo valve from system.
B. Remove the adjustment handle retainer
lock bolt. Remove the retainer lock plate.
Unscrew the stem retainer and pull the rate
adjustment handle out of the body.
C. Pull out the needle trim using a hooked
probe or similar devise. Use care to avoid
damage to the internal surfaces of the
SkoFlo valve. (See Figure I).
Figure I
r:\msoffice\excel\e-mail\o_manuals\SkoFlo sf15000nmfa\sf15000nmfa-manual-a1 Page 5 of 13

D. Unscrew and remove the base cap.
E. Screw a bolt into the thread on the piston (use handle retainer
lock bolt or any M8 bolt) and carefully pull out the piston assembly
and the springs. (See Figure II).
Figure II
F. If replacing the seal on the ceramic seat, remove the snap ring and seat
retainer. Use a hooked probe to carefully remove the seat. (See figure III).
Figure III
G. Lubricate new seat seal with Parker Super Lube or equivalent. Slide
seal onto seat holder. Install back up ring on low pressure side of
o-ring (toward outlet). Insert the seat into the body by slowly pushing
with a tool which will not chip the ceramic seat. Orient seat with
largest hole end into the body. Reinstall seat retainer and snap ring.
Figure IV
r:\msoffice\excel\e-mail\o_manuals\SkoFlo sf15000nmfa\sf15000nmfa-manual-a1 Page 6 of 13

H. Remove piston cup seal snap ring and cup seal retainer. Remove
seal. Lubricate new piston seal with Parker Super Lube or
equivalent. Slide seal onto piston (orient seal correctly).
Replace cup seal retainer and snap ring. Place piston spring
stack into the valve body (orient as shown in attached drawing
"Assembly Section / Parts List"). Carefully slide the piston
assembly into the valve body. Using the Piston Seal
Installer Tool, push seal and piston assembly into body to
clear base plate (See Figure V).
Figure V
I. Lubricate base o-ring with Parker Super Lube or equivalent.
Place o-ring into o-ring groove of base. Install back up ring on low
pressure side of o-ring.
J. Screw base plug into body until just past the edge of the body. Install
the base plug lock bolt and torque to maximum 10 foot-pounds
(1.4 kg-m). Be careful not to overtighten.
K. Install o-rings and backup rings on the needle trim. Locate the
backup rings on the low pressure side of the o-rings as shown
in Figure VI.
Figure VI
BACKUP
RING
r:\msoffice\excel\e-mail\o_manuals\SkoFlo sf15000nmfa\sf15000nmfa-manual-a1 Page 7 of 13

L. Push needle trim into the body.
M. Install o-rings and backup rings on the needle stem. Locate the
backup rings as shown in Figure VII.
Figure VII
N. Install adjustment handle assembly into the body. Torque the
stem retainer to 10 - 30 foot-pounds (1.4 - 4 kg-m). Orient
the stem retainer so that the retainer lock plate and retainer
lock bolt will fit in place.
O. Install the retainer lock plate and lock bolt onto the body.
Torque the retainer lock bolt to 10 foot-pounds (1.4 kg-m).
2. Replacing Needle Stem Assembly:
A. Disassemble and reassemble the SkoFlo valve using new seals as
described in the "Replace Seals" section above.
3. Replacing Piston / Pin Assembly:
A. Disassemble and reassemble the SkoFlo valve using new seals
and piston assembly as described in the "Replace Seals"
section above.
B. When installing pin holder into piston, hold piston in a manner
where the surface finish will not be damaged. Torque pin
holder to 100 inch-pounds (1.15 kg-m).
BACKUP
RING
r:\msoffice\excel\e-mail\o_manuals\SkoFlo sf15000nmfa\sf15000nmfa-manual-a1 Page 8 of 13

TROUBLE SHOOTING IMPROPER VALVE PERFORMANCE:
SYMPTOM CAUSE REMEDY
1. No Flow Upstream filter is Clean or replace
plugged. filter element.
Supply valve is shut Open valve slowly.
off.
Discharge line is Open valve.
shut off.
2. Fluctuations in Internal passage in Dismantle the valve
flow rates valve body between and clean up the
inlet and piston passage.
chamber is plugged.
Piston Springs are Install springs in
not installed accordance with
properly. drawing SF-0738
and Figure V.
Seat or pin worn Replace seat holder
or damaged. or piston assembly.
Supply pressure The flow controller
is not adequate. requires a minimum
of 200 psi (14 bar)
differential pressure
across the valve for
proper operation.
(Valves designed for
special high flows may
require a higher
differential pressure).
r:\msoffice\excel\e-mail\o_manuals\SkoFlo sf15000nmfa\sf15000nmfa-manual-a1 Page 9 of 13

RECOMMENDED SPARE PARTS:
QTY PART NUMBER DESCRIPTION
1 SF15000NMFB-20 Seal Kit (Qty 1 for each 10 valves)
STORAGE:
1. When storing SkoFlo valves prior to first use, it is recommended that
the valves be stored indoors. If stored outdoors, apply a light coating
of protectant to the exterior of the valve. The shipping plugs in the
INLET and OUTLET should remain in place.
2. When storing SkoFlo valves after being in use, dismantle, thoroughly clean
and reassemble. Then store as noted in number 1 above.
Please call the factory in Woodinville, Washington USA at phone number
425-485-7816 if you have any questions.
E-Mail: [email protected]
r:\msoffice\excel\e-mail\o_manuals\SkoFlo sf15000nmfa\sf15000nmfa-manual-a1 Page 10 of 13

Multi-Point System Sample Schematic
r:\msoffice\excel\service\mp-schem
r:\msoffice\excel\e-mail\o&m_manuals\sf5000c-manual-a3
Page 12 of 13
TANK
FILTER
PUM
P
EXP
PR
V
BP
R
BACK
PRESSURE
REGULATOR
PRESSURE
GAUGE
PULSATION
DAMPER
(EXPANSION
COMPENSATOR)
Chemical Supply System
CHEMICAL
OUT TO PROCESS
Chemical Injection System
CHEMICAL
TO VALVES
Notes:
1. Any number of injection points can be served by a single pump
and header system. The only limitation is the flow capability of the pump.
2. Check valve must be installed within 5 feet from the SkoFlo valve.
ISOLATION
VALVE
ISOLATION
VALVE
SF
FILTER
3-WAY
VALVE
CHEMICAL INJECTION
CONTROL VALVE
CHECK
VALVE
TO FLOW METER OR
CALIBRATION BEAKER
SF SF SF

MATERIAL LIST - Sko-Flo Valve
SF15000NMFB
ITEM QTY PART NO. MRP NO DESCRIPTION MATERIALS
11 SF15000NMFB-1 20282 BASE PLUG 316LSS
21 SF15000NMFB-2 20673 BODY 316LSS
31 SF15000NMFA-3A 20693 HANDLE (with set screw) 316SS
41 SF15000NMFB-3B 20674 NEEDLE STEM NITRONIC 60 SS
51 SF15000NMFA-4 20613 PISTON NITRONIC 60 SS
61 SF15000NMFA-5 20617 NEEDLE TRIM NITRONIC 60 SS
71 SF15000N-6-XXXL 20275 SEAT CERAMIC
81 SF15000NMFA-7 20639 PIN HOLDER 316LSS
91 SF15000N-8-XXXL 20638 PIN CERAMIC
10 1 SF15000NMFA-9 71002075 PIN SPRING 304SS
11 15 SF15000NMFA-10 22110 PISTON SPRING 316SS
12 1 SF15000NMFA-11 SEE BELOW O-RING (UPPER TRIM) EPR (KALREZ)
13 1 SF15000NMFA-12 SEE BELOW O-RING (LOWER TRIM) EPR (KALREZ)
14 2 SF5000C-12 SEE BELOW O-RING (STEM) EPR (KALREZ)
15 1 SF15000NMFB-13 71001867 CUP SEAL (PISTON) TEFLON w/ GRAPHITE
16 1 SF15000NMFA-16 SEE BELOW O-RING (BASE TO BODY) EPR (KALREZ)
17 1 SF15000NMFA-27 71001932 BACK UP RING FOR ITEM 12 PEEK
18 1 SF15000NMFA-28 71001930 BACK UP RING FOR ITEM 13 PEEK
19 2 SF15000NMFA-29 71001924 BACK UP RING FOR ITEM 14 PEEK
20 1 SF15000NMFA-17 20675 STEM RETAINER 316LSS w/ NI-BR BUSHING
21 1 SF15000NMFB-18 20677 RETAINER LOCK PLATE 316SS
22 1 SF15000NMFB-24 20689 PISTON GUIDE WASHER NITRONIC 60 SS
23 1 SF15000-18-XXXL SEE BELOW O-RING (SEAT) EPR (KALREZ)
24 1 SF15000NMFA-30 71001929 BACK UP RING FOR ITEM 23 PEEK
25 1 SF15000NMFA-31 20528 SEAT RETAINER NITRONIC 60 SS
26 1 SF15000NMFA-32 71002969 SNAP RING (SEAT) 15-7 SS
27 1 SF15000NMFA-22 71002882 RETAINER LOCK BOLT 316SS
28 2 SF15000NMFA-23 71002091 BASE PLUG LOCK BOLT 316SS
29 1 SF15000NMFA-33 20288 CUP SEAL RETAINER NITRONIC 60 SS
30 1 SF15000NMFA-34 71001945 SNAP RING (CUP SEAL) 302SS
31 1 SF15000NMFA-35 71001943 BACK UP RING FOR ITEM 16 PEEK
32 2 BPR15000MF-79 20531 CONNECTION ADAPTER 316SS
33 2 SF15000NMFA-35 SEE BELOW O-RING (AE ADAPTER TO BOD
Y
EPR (KALREZ)
34 1 SF15000-25 21353 NAMEPLATE 302SS
SEAL KIT, SF10000NMFA -20, EPDM - 22088
NOTES: SF15000NMFA-11, EPDM - 71001766 SEAL KIT, SF10000NMFA -20, KALREZ - 22089
SF15000NMFA-11, KALREZ - 71001768
SF15000-18-XXXL, EPDM - 71001758
SF15000-18-XXXL, KALREZ - 71001762
SF5000C-12, EPDM - 71001738
SF5000C-12, KALREZ - 71001741
SF15000NMFA-16, EPDM - 71001803
SF15000NMFA-16, KALREZ - 71001805
SF15000-18-XXXL, EPDM - 71001753
SF15000-18-XXXL, KALREZ - 71001756
SF15000NMFA-35, EPDM - 71001829
SF15000NMFA-35, KALREZ - 71001830
r:\msoffice\excel\drawings\skoflo\sf-0738
Page 13 of 13
20
8
28
26
109
11
15
29
30
1631 5
25
18
13
17
12
34
19
14
6
21
3
4
2
1
32
7
24
23 27
22 IN
OUT
title block=r:\msoffice\excel\drawin
g
s\tem
p
late\a
p
ort
)
SkoFlo Valve Model SF15000NMFB
SF15000NMFB FLOW CONTROLLER
ASS
EMBLY
S
E
C
TI
O
N
/
PART
S
LI
ST
S
F-
0
7
38
A
2
/
1
3/03
11
/
27
/06
SCALE:
DATE:
DRAWN BY:
REVISED:
DRAWING NUMBER REV
APPROVED BY:
NONE FJG
33

W:\Sales\PDF & EXCEL Drawings\O & M Manuals\SFI Customer Satisfaction
Survey.doc Page 1 of 1
Our focus is on you our customer and for ISO 9001:2000 compliance we have prepared and
request that you take the time to complete this customer satisfaction survey.
Company:
Contact:
Email:
Phone:
Please rate following categories Highly Highly
Dissatisfied N/A Satisfied
1. Product Quality 
2. Product Features 
3. Reliability 
4. After sale support 
5. Implementation 
6. Delivery 
Score from 1 (Low ) to 7 (High) (Low) N/A (High)
1 2 3 4 5 6 7
Recommend SkoFlo to friend or colleague.
Likely to Purchase Products from SkoFlo
Overall quality of relationship with SkoFlo
Overall level of satisfaction with SkoFlo
Overall level of satisfaction with respect to Product Valve
Overall level of satisfaction with respect to product
engineering
Level of confidence of SkoFlo abilities to provide compliant
product
Comments: