Friday, October 26, 2012
Thursday, October 25, 2012
Flow Control Solution: Triple offset metal seat butterfly valve
Flow Control Solution: Triple offset metal seat butterfly valve: SGV product: Triple offset metal seat butterfly valve Wafer Lug type triple offset/eccentric multi-layer metal hard seal butter...
Wednesday, October 24, 2012
Flow Control Solution: Forged globe valve-SGV
Flow Control Solution: Forged globe valve-SGV: SGV Forged globe valve J61H Product introduction: Design Description: -API602 design -outside screw and yoke -Bolted bonnet( ...
Flow Control Solution: Duo disc wafer Check Valve-Installation & Maintena...
Flow Control Solution: Duo disc wafer Check Valve-Installation & Maintena...: Duo Disc Spring Loaded Check Valve Installation & Maintenance Manual 1INTRODUCTION ...................
Monday, October 22, 2012
Duo disc wafer Check Valve-Installation & Maintenance Manual
Installation & Maintenance
Manual
1INTRODUCTION
...................................................................................................... ....... ..
2
2
PURPOSES.................................................................................................................. ...
2
3
DESIGN
FEATURES........................................................................................................ .
2
4
STRUCTURE AND PART LIST...................................................................................... ....
2
5
INSTALLATION..................................................................................................................
3
1
INTRODUCTION
The
design of this type of check valve has good structures and appearance. The discs open under the flow pressure with
direction from inlet port to outlet port. When the inlet pressure is lower than
outlet pressure, the discs close automatically due to differential pressure and
weight of the discs as a result of preventing backflow. The valve is designed
according to API 594 with face to face as per ASME B16.10 and the pipeline flange
to ASME B16.5, the pressure test of this type valve is according to API 598.
This type of valve is widely used in industries like petroleum, water, natural
gas etc. as well as power plant, metallurgy and textile industries.
2
PURPOSES
This
type of valve is widely used in petrochemical ad general industrial pipelines
for preventing pumps and other power driven machine from reversing, as well as
releasing mediums in the machines.
3
DESIGN FEATURES
3.1
Discs can automatically close with the effects of springs, fast in closing as
to keep the medium from backflowing.
3.2
The valve can be installed horizontally and it is light so that supporting seat
is not necessarily required.
3.3
Discs can fully open with a little differential pressure, fast speed and good
sealing performance.
3.4
Flow coefficient is 2.6 to 0.7, it becomes smaller as the valve size is larger.
3.5
Short face to face, small volume and light weight saves material, therefore
reduces the cost.
3.6
The valve is one-piece type, simple and compact with low water hammer effect,
the life span of this valve is long and it is reliable.
4
STRUCTURE AND PART LIST
5
INSTALLATION
5.1
Before installation, check the body cavity if it is clean and no dirt of other
corrosive residue, remove dirt and clean the valve, repair the defects which
are caused during the transportation.
5.2
When installing the valve, verify the operating requirements are in accordance
with that marked on body and nameplate. Check if the model of the valve, flange
size and face to face length is suitable for the application pressure and
temperature.
5.3
Dual plate check valve is normally installed horizontally in vertical or
horizontal pipelines. 5.4
Pay special attention to the flow direction when installing the valve, the flow
direction shall be the same as the arrow marked on valve body, otherwise the
valve will cut the flow required.
5.5
When the check valve is closing, the water hammer pressure will emerge. It will
be too serious to cause damage to the valve , pipeline or equipment, specially
for big size or high pressure pipelines. Users shall pay highly attention to
valve selections
Sangong
Flow Control Co., Limited
www.sangongvalve.com
Sunday, October 14, 2012
Friday, October 12, 2012
Triple offset metal seat butterfly valve
|
-550Forged globe valve-SGV
|
Sunday, October 7, 2012
Vacuum Globe Valve-Product Installation & Maintena...
Flow Control Solution: Vacuum Globe Valve-Product Installation & Maintena...: Vacuum Globe Valve Sangong Flow Control Co., Limited www.sangongvalve.com Product Installation & Maintenance M...
Saturday, October 6, 2012
Vacuum Globe Valve-Product Installation & Maintenance Manual-Sangong Flow Control
Product
Installation & Maintenance Manual
Service
This vacuum valve is mainly used in heat-engine
plant’s vacuum minus pressure and condensation system, Petrochemical,
Pharmaceuticals and other industry’s negative pressure condensation system. as
a open-close and separation device.
Performance
1. Pressure: PN10~100.0bar
2. Nominal diameter: DN10~DN150mm
3.Medium: Water、Steam、Air、Oil
4. Working Temperature: Carbon steel
t≤425 ,alloy t≤530
Working
principle and structure
1 Working Principle: move valve
clack up and down by shaft’s up-and-down movement, this movement leads to
valve’s transform between open and close.
2 Structure instrument
A Structure Type: full bore and
rising stem
B Operate type: manual or electric Connection type: butt weld or socket weld
C
D The height of valve is low and
E Bonnet packing box adopt vacuum
seal device, Nickel filled soft graphite packing, ,enhance PTFE packing and Grease seal ring, enhance seal performance by add high
vacuum seal silicon grease which improves the sealing effect of packing and
stem, separate system from air.
F Electric valve’ open and close are
control by electric actuator, and the structure of electric actuator can be
found in Manual of Electric Actuator
Maintenance,
Installation and Usage
1.
Maintenance
1) This valve should be stocked in
dry and venting indoor environment. Damp-prevent and rust-prevent
2)when the valve is installing and
transporting , start-stop part should be in closing position and the end should
be protected by cage , to prevent dust and rust, for example, shaft’s dovetail
threaded portion should be coated with grease substance, outside part should be
protected and dust-prevention
3) Period check should be executed
when stock in long time, shaft surface 、dovetail threaded portion, fouling and rust in channel, the
protection of welding face should be checked every three month, clean the
fouling and rust ,then protected by painting rust preventing oil.
4)During using process, add oil to
turning part, coat shaft’s dovetail threaded portion with lubricating grease .
Fill CaidonFC40 every four year..
2 Installation and Usage
1) Manual vacuum globe valve can be
installed in any position of the conduit, and electric vacuum globe valve
should be vertically installed in horizontal conduit, these valve usually keep
in completely open or close position when used. If required, valve also can be
kept in any position,
2) Below work must be
executed before installment
A Remove cage first ,
clean conduit and clear oil sludge
B Remove the protection oilpaper of
shaft’s dovetail threaded portion, then re-paint dovetail threaded portion with
grease
C Clean conduit then
install valve, avoid destroy seal face
3) Keep the correct flow
direction during installation
4) Rotate hand wheel makes shaft
move up-and –down ,to open and close valve ,during moving , valve under balance
force ,when near completely open and close ,should move slowly.
5) Manual operated valve, move
clockwise to open, and move anti-clockwise to close
6) Add “CaidonFC40”
to rotate place, separate system from air.
7) Before install and
use electric valve , electric actuator opening indictor and valve must be
checked according to Manual of Electric Actuator, make sure these
consistent .
8) Manual valve vacuum
globe valve(DN≥50) ‘s handwheel
and electric vacuum globe valve ;electric actuator should not be used for
hoisting.
9) The medium should not
contain hard particle, to avoid destroying seal face.
10) Valve have been test
and inspect before leave factory, can be taken pressure test or installed
directly.
Main Parts Material
Parts name
|
Body
|
Bonnet
|
Valve clack
|
Shaft
|
Seal face
|
Grease seal ring
|
Packing
|
Screw nut
|
Cast steel valve
|
25WCB
|
WCB
|
25
|
2Cr13
|
D507Mo
|
ZCuA19Mn2
|
Nickel
filled soft graphite packing
|
Carbon steel
|
Alloy valve
|
Chrome molybdenum steel
Chrome molybdenum cast steel
|
Chrome stainless
steel
|
Chrome molybdenum steel
|
Cobalt-base alloys
|
Stainless steel
|
Chrome molybdenum steel
|
||
Possible trouble and solution
Possible trouble
|
cause
|
solution
|
Leakage between valve clack and valve seal face
|
1.
some pollutant in seal face
2.
wear and wash-out in seal face
|
1.
Remove pollutant
2.
grind seal face again or weld and manufacture
seal face
|
Leakage in connection about body and bonnet
|
1.
2.damge in flange seal face
3.breakge or invalid in gasket
|
1.balance strength
2.repair again
3.change gasket
|
Leakage in shaft packing
|
1.
gland not enough press
2.
wear of packing
3.
pitting in shaft surface
|
1.
equably press gland by tightening screw
2.
increase or change packing
3.
coping shaft surface or change shaft
|
Shaft ‘s up-and-down movement not fflexible
|
1.too tough
|
|
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