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Forced Seal Ball Valve
Name:

Forced Seal Ball Valve

Category：

Ball valve

Remark:

The orbital ball valve and the gate valve are the same type of valve. The difference is that the closing part is a ball. The ball rotates around the center line of the valve body to achieve opening and closing. The ball valve is mainly used in the pipeline to cut off, distribute and change the flow direction of the medium. Ball valve is a new type of valve widely used in recent years

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【Product Introduction】
The orbital ball valve and the gate valve are the same type of valve. The difference is that the closing part is a ball. The ball rotates around the center line of the valve body to achieve opening and closing. The ball valve is mainly used in the pipeline to cut off, distribute and change the flow direction of the medium. Ball valve is a new type of valve widely used in recent years
 
【structure type】
The orbital ball valve can be divided according to the structure:
  1. Floating ball ball valve : The ball of the ball valve is floating. Under the action of medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure the sealing of the outlet end. The structure of the floating ball ball valve is simple, and the sealing is good, but the load of the working body of the ball is transferred to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. This structure is widely used in low-pressure ball valves .
  2. Fixed ball valve : The ball of the ball valve is fixed and does not move after being pressed. Fixed ball ball valves are equipped with floating seats. After receiving the pressure of the medium, the seats move, so that the sealing ring is pressed tightly on the ball to ensure the seal. Usually, bearings are installed on the upper and lower shafts of the sphere, the operation torque is small, and it is suitable for high pressure and large diameter valves. In order to reduce the operating torque of the ball valve and increase the reliability of the seal , oil- sealed ball valves have appeared in recent years . Both special injection of lubricating oil is injected between the sealing surfaces to form a layer of oil film, which enhances the sealing performance and reduces the operating torque. , More suitable for high-pressure large-caliber ball valves .
  3. Elastic ball ball valve : The ball of the ball valve is elastic. Both the ball and the seat sealing ring are made of metal materials, and the specific pressure of the seal is very large. The pressure of the medium itself can not meet the requirements of the seal, and an external force must be applied. This valve is suitable for high temperature and high pressure media. The elastic sphere is formed with an elastic groove at the lower end of the inner wall of the sphere to obtain elasticity. When closing the channel, the wedge-shaped head of the valve stem is used to expand the ball and compress the valve seat to achieve a seal. Loosen the wedge head before turning the ball, and the ball will return to its original shape, so that there will be a small gap between the ball and the valve seat, which can reduce the friction and operating torque of the sealing surface. 


【Performance parameters】
model
Q341F-16C
Q341F-16P
Q341F-25C
Q341F-25P
Working pressure (MPa)
1.6 ~ 2.5
Applicable temperature (℃)
≤180
Applicable medium
Water, steam, oil
Weak corrosive medium
material
Valve body, bonnet
Carbon steel cast steel
Chrome nickel stainless steel
Ball, stem
Chromium / chrome nickel / chromium nickel molybdenum stainless steel
Chrome nickel stainless steel
Sealing ring
Flexible graphite washer / 316 + flexible graphite washer
filler
Polytetrafluoroethylene


【Main connection size】
PN
DN
L
D
K
d
Y
b
Z-d0
Ws
Hs
Hw
Hd
1.6MPa
40
165
145
110
85
-
16
4-18
230
135
-
-
50
203
160
125
100
-
16
4-18
260
150
-
-
65
222
180
145
120
-
18
4-18
350
180
-
-
80
241
195
160
135
-
20
8-18
500
195
-
-
100
305
215
180
155
-
20
8-18
650
245
310
420
125
356
245
210
185
-
  22  
8-18
800
270
330
440
150
394
280
240
210
-
24
8-23
1000
295
390
470
200
457
335
295
265
-
26
12-23
-
-
440
510
600
1067
840
770
718
-
48
20-41
-
-
920
960
2.5MPa
40
190
145
110
85
-
18
4-18
230
135
-
-
50
216
160
125
100
-
20
4-18
260
150
-
-
65
241
180
145
120
-
22
8-18
350
180
-
-
80
283
195
160
135
-
22
8-18
500
195
-
-
100
305
230
190
160
-
24
8-23
650
245
310
420
125
381
270
220
188
-
28
8-25
800
270
330
440
150
403
300
250
218
-
30
8-25
1000
295
390
470
200
502
360
310
278
-
34
12-25
-
-
440
510
4.0MPa
40
190
145
110
85
76
18
4-18
230
135
-
-
50
216
160
125
100
88
20
4-18
260
150
-
-
65
241
180
145
120
110
22
8-18
350
180
-
-
80
283
195
160
135
121
22
8-18
500
195
-
-
100
305
230
190
160
150
24
8-23
800
250
320
430
125
381
270
220
188
176
28
8-25
1000
280
340
450
150
403
300
250
218
204
30
8-25
1200
300
405
480
200
502
375
320
282
260
38
12-30
-
-
450
530
6.4MPa
40
241
165
125
95
76
24
4-23
260
140
-
-
50
292
175
135
105
88
26
4-23
260
160
-
-
65
330
200
160
130
110
28
8-23
350
180
-
-
80
356
210
170
140
121
30
8-23
500
220
-
-
100
406
250
200
168
150
32
8-25
800
250
320
430
125
450
295
240
202
176
36
8-30
1000
295
340
450
150
495
340
280
240
204
38
8-34
1200
340
405
480
200
597
405
345
300
260
44
12-34
-
-
450
530
250
838
580
485
425
313
88
12-54
-
-
570
720
300
965
665
570
510
364
100
16-54
-
-
680
780



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