• Cast steel gate valve
  • Cast steel gate valve

Cast steel gate valve

Material of cast steel gate valve:  WCB,WC6,WC9,LCB,CF8,CF8M.CF3.CF3M,CN7M,904L

Size of cast steel gate valve:  2inch(DN50) - 36 inch (DN900)

Pressure of cast steel gate valve:  150LB(PN10)-1500LB(PN250)

Connection type:  Flange(FF,RF,FM,RTJ) BW

Kind of drive:  Wrench,Gear,Electric actuators and pneumatic actuators

Operating temperature :  -100℃ - 600℃

Working medium :  water, gas,oil,Sulfuric acid and hydrochloric acid

Catalogue:

Cast steel gate,globe,check valves.pdf


Brief introduction for the API gate valve.

The open-close part name is gate,that  this cast steel gate valve only can fully open or fully closed, they can not adjust the flow,the gate have two sealing face and the sealing face are wedge type,the gate also have two type according to interior structure,one is solid gate ,anther is flexible gate, the advantage of flexible gate is that it will not be stuck when being fastened between gate and seat. te maket of the flexible gate valve is bigger than other gate valves.


The kind of this cast steel gate valve.

We can divided into two types according to the  type of stem, one is non-rising stem gate valve, anther is rising stem gate valve,non-rising stem gate valve is mean that the screw of stem are in the body , we don't see the stem rising or decline when we opened and closed the gate valve, rising stem gate valve is mean that the screw of the stem are out of the body,we can see the stem rising or decline when we opened and closed the gate valve .

We also can divided into two types according to structure of the gate, one type is wedge gate valve, anther type is flat gate valve,wedge gate valve is mean the sealing face of the gate is wedge type(it have angle between them),flat gate valve is mean the sealing face of the gate is parallel type,wedge gate valve must rely on exogenic action to  mechanical seal,but flat gate valve can rely on  pressure of the medium to seal. so teh wedge gate valve have the bigger market than flat gate valve.


Advantage for the gate valve

All of the gate valve are full bore,so they have the very small fluid resistance and the sealing face is very resistant to shock and wear.

The flow of medium is not restricted when valves are installed in the pipeline.they have simple structure and have the short face to face.so the price is lower than ball valve.


Matters needing attention during installation

The workers must clean up the impurities in the piping and valves before the gate valve installed on the piping line.


The features of globe valve
Bolted Bonnet;Outside Screw and Yoke ;Rising stems;Metallic seating surfaces.
Body and Bonnet Connection
The body and bonnet of Class150~Class900 globe valves are usually bolted bonnet design .And the Class1500~Class2500 globe valves are usually of pressurized seal design.

Gasket of Cover Flange
Stainless steel + flexible graphite wounded gasket is used for Class 150 and Class 300 globe valve.Stainless steel + flexible graphite wounded gasket is used for Class ,and ring joint gasket is also optional for Class 600.Ring joint gasket is used for Class 900 globe valve.Pressurized seal design is used for Class 1500~Class 2500 globe valve.
Actuation
Hand wheel ,impact hand wheel and gear box is usually used for globle valve actuation.Chain wheel and electric acduator can be also used for globle valve actuation if being reguested by the customers.


Packing seal
Molded flexible graphite is used for packing material.PTFE or combined packing material can be also used if being requested by the customer.The internal surface of the stuffing box,of which area is contacted with the packing,is of excellent finish(Ra 3.2um).The stem surface ,contacting with the packing,should be rolled and pressed after being precisely machined,so as to reach to the high finish and compactness(Ra 0.8um)and ensure the reliable tightness of the stem area.
Belleville spring loaded packing impacting system
If being requested by the customer,the Belleville spring loaded packing impacting can be adopted for enhancing the durability and reliability of the packing seal.
Back seating design
All our globe valves have the back seating design.In most cases ,the carbon steek globe valve is fitted with a renewable back seat.For stainless steek globe valve,the back seat is machined directly in the bonnet or is machined after welding.When the globe valve is at fully open position,the sealing of the back seat can be very reliable.However,as per the requirement of API,it is not advisable to add or change packing by the mean of back seating when the valve is pressure containing.
Seat
For carbon steek globe valve,the seat is usually forged steel.The sealing surface of the seat is spray welded with hard alloy specified by the customer.Renewable threaded seat is used for NPS<10 globe valve,and welded on seat can be also optional if being requested by the customer.Welded on seat is used for NPS>12 carbon steel globe valves.For stainless steel globe valve,intergral seat is usually adopted,or to weld hard alloy directly intergrally.Threaded or welded on seat is also optional for stainless steel globe valve if being requested by the customer.
Stem design
The stem is of integral forged design.The minimum diameter of the stem shall per the standard requirement.
Stem nut
Usually,the stem nut is made of ASTM A439 D2.It is also can be made of copper ally if being requested by the customer.For large sized globe valve,rolling bearing is fitted at the two sides of stem nut in order to minimize the open and close torque of the globe valve.
Special globe valve
Besides the common globe valves,Chaoda Company also makes cryogenic globe valve,bellow sealed globe valve,Jacketed globe valve,etc.

OS&Y, Rising stem, Plug Disc
Bolted Bonnet, Threaded or welded seat ring
ASTM A216 WCB, A217 WC6, A351 CF8, A351 CF8M,
A351 CF3, A351 CF3M,A351 CN7M

GATE VALVE




Product Description:

OS&Y, Rising stem, Flexible Wedge
Bolted Bonnet,Threaded or welded seat ring
ASTM A216 WCB, A217 WC6, A351 CF8, A351 CF8M,
A351 CF3, A351 CF3M, A351 CN7M, A352 LCB

Standards Compliance:

Design and Manufacture: ANSI B16.34, API600 API6D, API603, BS1414
Face to face(end to end): ANSI B16.10, API6D

Flanged connection: 2"~24" to ANSI B16.5, 22", 26"~36" to MSS-SP-44 or to API605 on Request
Test and inspection: API598, API6D
Butt welded end: ANSI B16.5

A. Anti-friction ball thrust bearing:Reduces friction between mating parts to ensure smooth operation
B. Grub screw:Secures yoke nut in the bonnet
C. Grease nipple:Supplies lubricant to the mating parts

CLASS 150~1500 CAST STEEL GATE VALVE

NO.
Part name
Material
19
Grease nipple
Brass
18
Grub screw
Carbon steel
17
Hand wheel nut
Carbon steel
16
Hand wheel
Malleable lron/cast steel/ ducile lron/fabricated steel
15
Yoke nut
Carbon steel/SS
14
Eye bolt and nut
A 193 B7/A194 2H~A193 B8/A194 8
13
Pin
Carbon steel/stainless steel
12
Stem nut
A 439-D2/cu-alloy
11
Gland flange
Carbon steel/equivalent to body material
10
Gland
Stain less steel
09
Back seat
Stain less steel
08
Stem
Stain less steel
07
Seat ring
CS+SS/SS/SS+STL
06
Wedge
Material see body
NO.
Part name
WCB
LCB
WC6
WC9
05
Bolt and nut
A193 Gr B7/A194 Gr 2H
A320 Gr L7/A194 Gr 4
A193 Gr B16/A194 Gr 4/7
A193 Gr B16/A194 Gr 4/7
04
Gland Packing
Graphite
Graphite
Graphite
Graphite
03
Gasket
Spiral wound/Soft lron
Spiral wound/Soft lron
Spiral wound/SS304
Spiral wound/SS304
02
Bonnet
A216 Gr WCB
A352 Gr LCB
A271 Gr WC6
A271 Gr WC9
01
Body
A216 Gr WCB
A352 Gr LCB
A271 Gr WC6
A271 Gr WC9
NO.
Part name
C5
C12
CF8
CF8M
05
Bolt and nut
A193 Gr B16/A194 Gr 4/7
A193 Gr B16/A194 Gr 4/7
A193 B8/A194 8
A193 B8M/A194 B8
04
Gland Packing
Graphite
Graphite
Graphite
Graphite
03
Gasket
Spiral wound/Soft lron
Spiral wound/Soft lron
Spiral wound/SS304
Spiral wound/SS316
02
Bonnet
A217 Gr C5
A217 Gr C12
A351 Gr CF8
A351 Gr CF8M
01
Body
A217 Gr C5
A217 Gr C12
A351 Gr CF8
A351 Gr CF8M

CLASS 150~1500 CAST STEEL GATE VALVE

Class
Dimensions
150
Size
inch
2
2-1/2
3
4
6
8
10
12
L-RF
mm
178
191
203
229
267
292
330
356
L1-BW
mm
216
241
283
305
403
419
457
502
L2-RTJ
mm
191
203
216
241
279
305
343
368
H
mm
400
490
510
585
795
1015
1230
1465
K
mm
200
200
250
300
350
350
400
450
Wt
RF
kg
18
28
30
50
85
128
220
310
BW
kg
15
22
26
40
77
118
200
290
RTJ
kg
20
29
37
56
84
138
210
310
300
Size
inch
2
2-1/2
3
4
6
8
10
12
L-RF
mm
216
241
283
305
403
419
457
502
L1-BW
L2-RTJ
mm
232
257
298
321
419
435
473
518
H
mm
470
525
533
610
845
1050
1295
1600
K
mm
200
200
250
300
350
350
400
450
Wt
RF
kg
24
44
48
73
145
226
350
580
BW
RTJ
kg
20
35
37
54
110
174
285
495
600
Size
inch
2
2-1/2
3
4
6
8
10
12
L-RF
mm
292
330
356
432
559
660
787
838
L1-BW
L2-RTJ
mm
295
333
359
435
562
664
791
841
H
mm
495
550
615
735
1005
1245
1480
1730
K
mm
200
250
300
350
450
500
600
750
Wt
RF
kg
35
55
72
126
365
444
700
940
BW
RTJ
kg
32
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