Premier KVT Descaling ValVes

Premier KVT
Descaling
ValVes

2
Descaling ValVes
Primary Metals Industry Descaling Valve-Pressure Compensated & Balanced Twin Disc Parallel Slide Gate Type,Patented
KVT is an innovative company with a niche in the High Energy
Industries. Innovative and excellent designs are achieved with quality
products as end result. The complete product range of KVT includes:
• Descaling Valves
• Parallel slide gate valves
• severe Duty control valves
• steam conditioning valves (general and custom designed)
• Blowdown Valves
• micro-flow globe control valves
• Fluid Flow control devices (specially designed Orifice
Plate systems)
• Pump minimum Bypass Flow control valves
The Descaling valves use only metal seats and provide perfect tight
shut-off. The sealing mechanism is pressure compensated and utilises
balanced twin discs for efficient energy management and long life
under frequent operation.

descaling ValVes
We have been launched toward the state-of-the art
technologies in descaling system of primary metal industry.
Our descaling valve provides the best performance of
perfect tight sealing with long life, easy maintenance and
safety features in the high pressure fluid flow control. For
example the valve can be operated in very frequent on-off
control and also flow throttling to be met with the system
control requirements.
We are Korea’s no.1 special valve engineering company,
located in siHwa Kongdan, which is one of big industrial site of
Korea national industrial complexs near seoul. Our business
philosophy is to share the valve technology with a valuable
customers new and innovative valve designs with reliable
safety and quality, adopting new technology of relative field of
science.
We intend to supply the valves & fluid flow control technology
to high energy industry.
dEscalIng ValVEs
Hi-Fluidic Master descaling ValVe lines
• Descale Valves
• Pump By-Pass control Valves
• Pump minimum Flow control Valves(arV)
• Orifices & Flow Patterners
• inline axial Plug(nozzle) Type check Valves
cOnTenTs
Product Range 4
Operation 4
Features & Benefits 5
Engineering & services 6
general specifications 7
Orifices 8
Pump Bypass Valves 16
Pump Minimum Flow 22
control Valve 24
special check Valves 26
Ordering Information 27

4
Descaling ValVes
Product Range, Descaling valves
1Descaling valve series cover virtually all type of descaling applications and other heavy energy end industry.
extensive product range covers.
• Parallel slide gate Valves of Dn15~Dn400, Pn150(cl900)~Pn760(cl4500).
• custom Designed special Valves.
• severe Duty globe control Valves, Dn15~Dn300, Pn63(cl600) ~Pn760(cl4500).
• High Pressure letdown control Valves, Orifices and Flow absorption Devices.
For descaling Valve system.
• sizes from Dn50(2”) through Dn200(8”), Pressures of Pn150(cl900) through Pn420(cl2500).
• Hydraulic & Pneumatic actuation with various Pilot Operation.
• Fail safety Position & no Pre-fill required design.
design cOncePts and OPeratiOn
Flow inlet side Flow inlet side
P
a1 a
P P
Flow Outlet side
Pressure compensated and Balanced Twin Disc Parallel slide gate Type
Hi-Fluidic Master Descaling Valve
design concepts
• Pressure compensating-
Through the hole of the sliding discs
• Pressure Balancing by twin ports-
The same offsetting force acting on each port
• Only sliding contact allowed to seal the seatsno
compression sealing required
• Very low thrust force required on the stem-
Due to sliding not high contact stress on the seat sealing
• Disc spring assist force to sealing surface-
Very compact design of valve plug(disc holder)
• Wide flat seat surface & hardfacingseat
is wide and stellite #12 HF
Disc is coated by super hardness ceramic
P
Operation
• spray water flow separated into two flow path and the flow
stopped on each gate
• Twin discs of the plug move to open & close position with
sliding contact on the seats
• apply only a friction force and forces of disc sping
• manual, Pneumatic piston(fail close, fail open, as is position,
Hydraulic operator applicable
• Fast acting tight shut off and flow throttling using speed/
position controller
• selectable normal closed or opened position

Descaling Valves, Design Features & Benefits
• no soft seal for tight shut-off
design Features Benefits
simple, long lasting life, allowed tough service environment (conventional
descale valve—sealing with soft seal)
• modular Design Quick internal replacement, easy to maintenance
• super ceramic coating on Discs
• Flexible seating mechanism
long lasting life, Perfect sealing under dirty water condition, anticorrosive,
Better sealing maintainability
no surface hardening fatigue due to high contacting(compression) stress of
conventional descale valve, guarantee longer life seating
• rugged Body assembly simple, stable operated, equipped self support, integrated flange
• Flexible Features for Operators Positive provision for all kind of actuator, with economical approach
• economical & reliability Design
maintain accuracy, performance, and reliable operation with reasonable
economical cost(at least 25% share for customer)
• Professional state-of-art design Fluid flow patterning using computerized Fluid Dynamics analysis
lower socket
Bolt
Yolk Bar
cylinder Flange
Bolt
stem cover Plate 5
Flow intlet side
Bolt
Pin 10
Disc spacing 9
Plug 7
sliding Disc 8
lower gland Follower
shift
Bracket Bolt
Bracket
26
29
23
17
19
11
13
12
21
20
Body assembly
Valve Trim
25
24
16
18
15
4
6
2
3
actuator shaft
lower connector
Upper gland Follower
Bolt
V-Packaging
Bolt
O-ring
O-ring
right cover
Flow Outlet side
1
11
Body
Bolt
sUPPOrT sTrUcTUre
O-ring
Piston actuator assembly
(Pneumatic Double acting)
42
O-ring 36
O-ring 34
Bolt 32
Descaling ValVes
44
43
41
40
38
39
37
35
33
34
31
30
28
27
stud nut
stud Bolt
Upper Plate
Piston nut
Piston
O-ring
cylinder
lower Plate
Bush
Bolt
Yoke Flange
actuator shaft
Upper socket
Upper connector
descaling Valve exploded View
Our engineered product have focused to niche market of high technology needs a severe duty service
in high energy, dangerous, high safety and reliabilities required industry.
Our Design experience, innovative & Up-to-Dated engineering solutions, and Passion for pursing the
state of the art Technologies, is always focused on customer satisfaction in Primary metal industry.
Photo by the courtesy of POscO
5

6
Descaling ValVes
Engineering And Service
descaling systeM ValVe engineering
• spray Water continuous Pre-Fill system
• Pump By-Pass system(scheme-1,2,3)
• manual isolation Valve
• nozzle check Valve
• letdown(Breakdown) restriction Orifice
Flow inlet side
From Pump
electrical drain
connection
tP5
By-Pass
Outlet
tP2
electrical Poppet
indicator
tP4
external air
supply
external tank 4
connection
1
From Pump
external air
supply
4
external tank
connection
tP1
2
3
1
to system
From Pump
1
tP1
2
to system
tP3
4
P a
t B
external tank
external air
connection
electrical drain 5
connection
tP2
electrical Poppet
indicator
tP4
tP3
4
P a
t B
external tank
connection
external air
connection
connection
tP5
By-Pass 3
scheme 1: By-Pass Valve Only
Outlet
scheme 2: check Valve and By-Pass Valve
external drain
connection
5
external drain
connection
5
tP2
tP1 tP3 tP4 tP5 tP6
Poppet
electrical
indicator
The pump bypass valve is normally consisted with multistage
letdown restriction orifice and flow patterner which
is a patented flow turbulent straighten device. By Utilizing
the flow patterer the outlet piping of Pump Bypass piping
do not experience severe vibration and noise. even
sudden surges due to on/off operation is eliminated.
Orifice inlet
letdown(Breakdown) Orifice
scheme 3: Two Way system and By-Pass Valve
2
3
to system
By-Pass
Outlet
Flow
Flow Patterner (Patented)
letdown orifice and Flow Patterner
KVT offer several kind of flow patterner to meet the descaling system requirements.
Pressure letdown(Breakdown) Orifice

General Specification - Technical Information
Outline diMensiOn - (25MPa/40MPa)
n-Ødb
Ød2
Ød1
nb-Ødk
ØW
Flow Capability - (25Mpa/40Mpa)
l
Ød
H
H1
50 65 80 100 125 150 200 250
d 50 65 80 100 125 150 200 250
d1 92 105 127 157.5 186 216 270 324
d2 235 265 305 355 420 485 550 675
L 398 465 530 655 800 920 1090 1310
Lb 165 195 240 300 370 450 550 660
H 630 745 858 1053 1285 1430 1768 1985
H1 250 310 355 405 495 560 600 650
W 166 208 256 256 306 358 358 418
N 8 8 8 8 8 8 12 12
Db 29.5 32.5 35.5 42 48 55 55 68
Nb 4 4 4 4 4 4 4 4
Dk 36 42 48 52 55 68 74 80
Nominal Size 50 65 80 100 125 150 200 250
Q(litre/min) 800 1,100 2,000 3,000 4,200 5,500 9,000 20,000
Pressure drop (kPa)
FlOW rate Vs. Pressure drOP
900
800
700
600
500
400
300
200
100
10²
10³
Flow rate (liter/Min)
nominal Pipe size,mm
50 65 80 100 125 150 200 250
10⁴
Flow Velocity limitation
Descaling ValVes
allowable flow velocity in descaling
piping system is generally considered
as following limits.
• For short to medium length within
6m pipe runs : 8m/sec.
• For long pipe length over 6m pipe
runs : 6m/sec.
• Other pipe runs except steel works
descaling system : 5m/sec.
7

8
Descaling ValVes
Master Orifices
all of pressure letdown(breakdown) orifice are
designed by a experienced professional engineer using
sophisticated computational fluid dynamics tool.
PuMP By-Pass ValVes & systeM
The pump bypass valve system of a steel rolling mill plant consists of
a descaling valve, orifice and flow patterner. When the bypass valves
perform a minimum flow control function of pump to protect against
overheating, the pump bypass valves are designed to ensure fluid
structural integrity of the trim against severe duty cavitation.
PuMP ByPass PiPing Figures OF descaling systeM
Flow
locatable Pipe line
(straight)
a Patent Hi-Fluidic Master descaling Valve
Hi-Fluidic Master Orifice
Flow Patterner is functioning a device of flow straighten the
severe turbulent flow due to extremely high flow speed. also the
flow patterner to absorb the vibration and noise of the piping.
normally under the high speedy fluid flow in pipe obstructions
locatable Pipe line
(straight)
Patented Hi-Fluidic Flow Patterner
scale sluice trench
such as elbow, tee, and branches cause the obstructions to make
severe erosion problems. The severe fluid flow and its dynamic
flow become calming and mild flow due to the inside long
straighten orifice, fair ring of the end of orifice, and flow divider .

Master Pump Minimum Flow Control Valves
When a motor or turbine-driven boiler feedwater discharge
flow. some of the energy generated from the pumping action is
converted to heat. if the pump discharge flow falls below a set
minimum level there is a rapid increase in both temperature and
pressure within the pump. This increase can cause mechanical
pump damage due to caviattion or excessive pressures. To guard
condenser
deaerator
tank
Boiler Feed Pump
condenser
discharge
deaerator
storage tank
Feedpump
Minimum Flow
or recirc. Valve
Main
supply
to Boiler
Or reactor
MiniMuM FlOW ValVe requireMents:
against this problem, a minimum flow line is used downstream of
the pump charge. The minimum flow line takes the full discharge
pressure from the pump and passes a set minimum flow to either
the deaerator(deaerator tank) or the condenser. The feedwater
valve cannot serve this purpose as the full head of the boiler is on
the feedwater valve outlet at start-up.
For a valve to be successful in the service with high differential pressures, it must be
able to deal with four general problems.
• The valve must be able to protect its trim from cavitation damage between initial valve
opening and full valve opening.
• The valve must be able to deal with foreign matter and pipe scale entrained in the flow
stream. Foreign matter will cause problems to the valve trim.
• The valve must able to provide zero leakage as any leakage in the service will cause
wire-drawing across the seat and trim failure occur.
• The valve must be able to maintain zero leakage throughout a normal service life. This
is the most difficult requirement for a pump minimum flow control valve.
Pump Minimum Flow control Valve be designed to meet the above requirements.
One of the severe potential problems in pump
minimum flow line is the intrusion of foreign dirty
particles.
Trim technology cover well known brand trims
over the world based on a velocity profile and
pressure profile. In case dirty water or containing
impurities fluid service the use of pressure
profile trim is most primary selection. But very
high differential pressure drop service primary
selection of the trim should be based on a velocity
profiles. But all the case the pump minimum flow
control valve shall be no seat leakage trim.
We know the severe duty service trim
technology that you prefer & familiar valve
manufacturers. We can solve the problems of
those valves and serve for customers with more
better solution in valve product.
Descaling ValVes
For pump minimum flow control, the valve have to
be satisfied against severe cavitation phenomenon
due to high differential pressure across the valve
trim. the trim is designed and analyzed by ingenious
design tools such as cFd. above is a sample
figure of cavitating analysis of the trim of minimum
flow control valve.
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Descaling ValVes
Pump Minimum Flow Control Valves (Without Power Operator/Automatic Recirculation Valve)
developed for high pressure centrifugal pump protection. Popular applications
include boiler feed water, petroleum, and steel mill hot strip descale water.
Feature
• Positive fail open bypass.
• integral pulsation damper.
• Forged steel body.
• Design does not utilize a pilot valve or tube.
• start-up bypass inserts available due to
start-up debris.
• maxi-Flow protection available.
Minimum Flow Control
With Power Operator
restriction
Office
control Valve
Or gate Valve
Minimum Flow Control
With Auto Recirc. Valve
automatic
recirculation
Valve
control Valve
Or gate Valve
Pump
Back Press.
Valve
By-Pass line
Pump
reservoir
reservoir
it provides economical and reliable protection for low and reverse flow.
By combining the functions of main line check valve, flow sensing, bypass flow
control, bypass pressure reduction, pulsation dampener, and bypass line check
valve, the valve eliminates at least seven components necessary with a conventional
system. The valve operates without air or electric power and is easily installed
with three connections.
the valve is installed on the pump discharge, just as an ordinary check valve
would be.
Upon pump start-up, and without process demand, the bypass is completely open,
recirculating the necessary minimum flow. Once process demand starts, the
spring loaded disc is lifted and held in position by flow demand. Until main flow
demand exceeds recommended minimum flow, the valve will modulated. as the
main flow demand increases beyond recommended minimum flow, the bypass will
close and all flow will go to the process.
BeneFit
• Positive pump protection.
• smooth operation.
• superior pressure containing integrity.
• less sensitive to debris and operation.
• cycle is not as harsh which can lead to system instability.
• avoids possible damage to bypass trim.
• Unique feature to prevent pump run-out.
• long term proven design...Your operation is not a test lab.
P
the minimum flow control valve(automatic recirculation valve) of descaling pump is designed, manufactured and qualified by based on custom designed Product.
r
B

Check Valves For Descaling System (Custom Designed High Pressure Check Valve)
The range of our High pressure service check valves are
specially custom designed to make harmony with severe duty
applications in descaling system. The valves may be used as
stand alone duty or incorporated within stop valve or other
devices. We recommend the check valves with an axial plug(or
nozzle) valve type. check valves are typically formed in axial
BeneFits
• minimizes the damping effects of hydraulic
transient in fluid flow system.
• connect directly the flowing control devices
such as orifices and back pressure regulation
devices.
• minimizes chattering problems associated
with conventional swing check valves in flow
induced vibration.
• Provides quick dynamic response reducing
reverse flow.
descaling systeM—ValVe Ordering/design inFOrMatiOn
descaling ValVe
• Flow rate, inlet Pressure, Outlet Pressure, Temperature, connections,
Operating Power requirements, Fail safety Position, Pump set Technical data
PuMP MiniMuM FlOW cOntrOl ValVes
• main Flow, min. Pump Flow, Pump Discharge Pressure(normal, By-Pass,
shut-Off), By-Pass Back Pressure, Temperature, strainer/Filter information,
Pump Data, Power control(Power Design information) or automatic
recirculation Valve Orifices, Back
Pressure regulatiOn deVices and cHeck ValVes
• same as Pump minimum Flow control Valves and allowable Pressure Drop
prevention of back flow. The valves are specifically designed
for fast-acting-reversing system where back flow is a constant
concern such as descaling system. in case of critical severe
duty application such as descaling, Our check valves offer the
following benefits:
Features
• Unique Design.
• Few moving Parts.
• axial movement disc.
• Proven streamlined flow path with venture effect.
• short stroke of spring assisted nozzle plug.
• sizes from Dn50(2”) to Dn500(20”).
• Pressure classes from ansi 150# to 4500#.
• Wide range of construction material.
• easy maintenance & reliable long life.
Descaling ValVes
11

distriButOr’s details
PREMIER VALVES (Pty) ltd
P.O. Box 11735, Randhart, south africa, 1457
sales@premiervalves.co.za
T +2711-908-3760 F +2711-908-1268
www.premiervalves.co.za
Design: www.infiltratemedia.co.za