F4 & F5 PN16 Ductile iron Resilient wedge gate valve
Body: Ductile iron GGG40/GGG50
Disc: Ductile iron+EPDM/NBR
Stem: Stainless steel
Size: DN40-DN600
Hydraulic Inspection:
Body: 2.4 Mpa
Seat: 1.76 Mpa
1. Using and the specification of character:
The valve is the normal wedge valve of API 6D, suitable temperature -20ºF~800ºF, Suitable medium: water,vapor,oil and other no erosive long pip age, using for cutting off or putting through the float medium:
The specification of character following:
| Pressure rating(300LB) |
Maximum test pressure(psig) |
| Shell test |
1125 |
| Back seal test |
815 |
| Seal test |
815 |
| Tightness test |
80 |
Medium operating temperature
(ºF) |
-20~100
~150
~200
~250
~800 |
Maximum working pressure
(psig) |
720
705
675
665
410 |
| |
|
|
|
2. Working principle and structure illustration
2.1 The valve is normal wedge valve, device for the horizontal pipe line depending on the twirl of hand wheel to open or shut the wedge, cutting off or putting through the float medium.
2.2 Face to face dimensions: API 6D, End flange dimensions: ASME B16.5.
2.3 RTJ flange gasket:304SS+flexible graphite.
2.4 Base structure: API 6D normal wedge valve.
2.5 Nominal size:6"
3. Main part material:
| Part name |
Material |
| Body,Bonnet,Yoke |
WCB |
| Wedge |
WCB+Cr13 |
| Stem |
1Cr13 |
| Seat ring |
20#+802 |
| Packing |
Flexible Graphite |
| RTJ flange gasket |
304 SS+ Flexible Graphite |
| Stem nut |
A439-D2 |
| Bolt,Nut |
A193-B7,A194-2H |
ML/JS24-2004 WEDGE VALVE USING INDICATION BOOK 2/3
4 The coefficient of flow checking computations for the valve:
Nominal Size
DN |
Conduit diameter
D |
Flow damp factor
ξ |
Volume flow
qV |
Pressure losing
△P |
Flow factor |
| AV |
KV |
| mm |
m |
|
m3/s |
Pa |
m3/h |
m3/h |
| 40 |
0.038 |
0.50 |
0.002268 |
1000 |
0.002268 |
81.008 |
| 50 |
0.050 |
0.50 |
0.003927 |
1000 |
0.003927 |
140.250 |
| 80 |
0.076 |
0.40 |
0.009073 |
800 |
0.010144 |
362.280 |
| 100 |
0.100 |
0.20 |
0.015708 |
400 |
0.024836 |
887.017 |
| 150 |
0.150 |
0.10 |
0.035343 |
200 |
0.079029 |
2822.470 |
| 200 |
0.201 |
0.08 |
0.063462 |
160 |
0.158654 |
5666.227 |
| 250 |
0.250 |
0.08 |
0.098175 |
160 |
0.245437 |
8765.605 |
| 300 |
0.300 |
0.07 |
0.141372 |
140 |
0.377832 |
13493.989 |
5 Protecting,Maintaining,Installing & Adjusting,Using and Service
5.1 Protecting and Maintaining
5.1.1 The valve must be kept in the dry and ventilated room, and both sides protected by covers always.
5.1.2 The valve must be checked periodically, eliminate the dirt, and put the protected oil to the machining faces.
5.1.3 After installing, the valve must be examined and repaired regularly.
5.1.4 After checking the assemble, the valve must be tested by seal pressure and record in detail to delve.
5.2 Installing & Adjusting
5.2.1 Before assembling, check that the valve symbol if suit to the using requirement carefully.
5.2.2 Before assembling, must check the internal and seat, and the dirt not be allowed to attach them.
5.2.3 When assembling or disassembling, the needed space must be considered.
5.2.4 When the valve be installed in the fitted conduit, they must be wide-open to avoid the wedge to be damage from the iron rust of the fitted conflict or others.
5.2.5 After for being kept a long time, the valve must be operated testing before using.
5.2.6 Check that if the bolts had be screwed down equal.
5.3 Using
5.3.1 When being used, the wedge must be wide open or close, opening the wedge to adjust the flow quantity is not be allowed, otherwise which will damage the seat when there is high flow velocity in medium.
5.3.2 Where being used, should be often added the copper-bearing lubricant into the sides of stem acme threads.
5.3.3 Opening or shutting the valve, must use the hand-wheel, instead of lever or other tools.
5.4 Service
ML/JS24-2004 WEDGE VALVE USING INDICATION BOOK 3/3
| The fault will happen probably |
The reason of fault |
The ways to eliminate |
| Packing leakage |
1.Not impact the packing gland
2.The packing number not enough
3.The packing is lapse using too long time or keeping unwell |
1.Screw down the nut equality and impact the packing gland
2.Add the packing number
3.Change the new packing |
| Leakage between the seal |
1.The dirt and soil attach the seal
2.Seal damage |
1.Clean up the dirt and soil
2.Machine and repair the seat, wedge seal |
| Body and bonnet joint leakage |
1.Bolt joint firm not equality
2.Flange seal damage
3.Gasket rupture or lapse |
1.Screw down the bolts equability
2.Repair the seal again
3.Replace the new gasket |
| The twirl of handwheel flexible or the wedge not open and shut |
1.Packing pressured too tight
2.Gland flange and gland device askew
3.Stem nut damage
4.The screw of stem nut flay and rupture badly
5.Stem inflect |
1.Properly unscrew the nut of packing gland
2.Adjust the gland flange and gland
3.Disassemble repair screw and clean up the dirt and soil
4.Replace the stem nut
5.Adjust the stem |
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