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Gas-liquid Linkage Direct Buried Ball Valve
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Gas-liquid Linkage Direct Buried Ball Valve

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Ball valve

Remark:

The gas-liquid linkage ball valve is widely used in long-distance natural gas pipelines, and has the advantages of stable transmission, easy control, and no need for power supply. The actuators for the cut-off valve of the natural gas long-distance pipeline line are of electric, pneumatic, electro-hydraulic linkage and gas-liquid linkage, and are also equipped with manual mechanisms for backup. The gas-liquid linkage ball valve is powered by high-pressure natural gas and is often used as a line cut-off valve for gas pipelines. This type of valve has been widely used in China's West-to-East Gas Pipeline and Sichuan Oil and Gas Field Circular Trunk Pipe Network.

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【Product Introduction】
The gas-liquid linkage ball valve is widely used in long-distance natural gas pipelines, and has the advantages of stable transmission, easy control, and no need for power supply. The actuators for the cut-off valve of the natural gas long-distance pipeline line are of electric, pneumatic, electro-hydraulic linkage and gas-liquid linkage, and are also equipped with manual mechanisms for backup. The gas-liquid linkage ball valve is powered by high-pressure natural gas and is often used as a line cut-off valve for gas pipelines. This type of valve has been widely used in China's West-to-East Gas Pipeline and Sichuan Oil and Gas Field Circular Trunk Pipe Network.


【Features】
1. Automatic cut-off function under abnormal working conditions
The gas-liquid linkage ball valve is set with a pressure upper and lower limit and a pressure drop rate to meet the needs of operation. When the pipeline pressure is higher or lower than the upper and lower pressure limits, the ball valve closes automatically. In the event of an explosion or rupture of the pipeline, the valve will automatically close when the detected pressure drop exceeds the set pressure drop rate.
2. Multiple operation modes
The gas-liquid linkage ball valve has four operation modes: manual, automatic, pneumatic and remote control. You can choose the operation mode according to the actual operating conditions to improve the safety and reliability of the valve. In manual mode, you only need to change different gears and press the hand pump handle to realize the switch operation; pneumatic mode, pull the operation handle in the direction of "left open and right close" to complete the switch operation. Start the automatic function, you can achieve automatic control of the valve. If the valve is equipped with a remote transmission remote control device (RTu), the remote control of the valve can be achieved by remote signal transmission. The Shaanxi-Beijing Gas Transmission Pipeline has enabled the remote shutdown function online.
3. High security
The gas-liquid linkage ball valve uses high-pressure natural gas or a hand pump as the power source, without the need for additional mechanical or electrical equipment, and has a low accident rate, safety and reliability, and good economy.

【Structure and working principle】
Pneumatic-hydraulic ball valve main control box by a Lineguard, liquid tank, remote terminal apparatus, the rotating rotary wing actuator, the valve, gas supply tank, control box, impulse lines, test tubes and other components [2], buried ball There is also a buried middle cavity venting tube, etc. The basic structure is shown in Figure 1.
The gas source of the gas -liquid linkage ball valve is directly pressurized from the main line and used as the power source of the ball valve . Under normal working conditions, open and close the tank to fill half of the tank with hydraulic oil, the gas source tank and the comparison tank are filled with natural gas, the delay tank is an empty tank, when the ball valve is activated, the oil is pushed by the gas and the actuator is pushed by the oil The opening and closing of the gas-liquid linkage ball valve . The actuator is divided into rotary vane type gas-liquid linkage actuator and shift fork type gas-liquid linkage actuator. The rotary vane actuator is equipped with a rotor, which is immersed in hydraulic oil. The gas-liquid tank comes with oil to push the rotor to rotate. The rotor drives the ball valve connected to it to rotate to realize the switch of the ball valve . , The hydraulic oil pushes the reciprocating motion of the piston, and then converts it into the rotary motion of the valve through the shift fork, driving the ball valve connected to it to rotate to realize the switching operation of the ball valve. There is a pneumatic switch handle in the operation box. The automatic control system compares the instantaneous pressure of the main line with the pressure in the comparison tank to determine the switch of the valve to realize automatic control. The delay tank can delay the valve action time and avoid instantaneous misoperation. The above two types of valves each have advantages and disadvantages. The working efficiency of the rotary vane type is higher than that of the fork type, but the latter operates more smoothly than the former in the switching process.


【Executive Standards】
Design standard GB / T 12237
Structure length standard GB / T 12221
Flange connection standard JB / T 79.1
Inspection and test standard GB / T 26480
Pressure-temperature: GB / T 9131
Product identification: GB / T 12220
 
【Performance parameters】
Nominal pressure PN (MPa)
case
Test pressure (MPa)
Upper seal
Seal (liquid)
Seal (gas)
1.6
2.4
1.8
0.6
1.8
2.5
3.8
2.8
0.6
2.8
4.0
6.0
4.4
0.6
4.4
6.4
9.6
7.0
0.6
7.0
10.0
15.0
11.0
0.6
11.0
16.0
24.0
18.0
0.6
18.0


【Applicable medium and applicable temperature】

Shell material
Applicable medium
Applicable temperature (℃)
Carbon steel (C type)
Water, steam, oil
≤425
Chromium nickel titanium steel (P type)
Nitric acid
≤200
Chromium nickel molybdenum titanium steel (R type)
Acetic acid
≤200
Chrome Molybdenum Steel (Type I)
Water, steam, oil
≤550

【Materials of main parts】
Valve body, bonnet
Valve plate, valve seat
Stem
Stem nut
filler
Handwheel
Carbon steel
High quality carbon steel + hard alloy or stainless steel
Chrome stainless steel
Aluminum bronze
Graphite asbestos packing
Malleable cast iron
Chromium nickel titanium steel
Stainless steel, stainless steel + hard alloy
Chrome nickel titanium stainless steel
Aluminum bronze
Polytetrafluoroethylene
Malleable cast iron
Chromium nickel molybdenum titanium steel
Stainless steel, stainless steel + hard alloy
Chrome nickel titanium stainless steel
Aluminum bronze
Polytetrafluoroethylene
Malleable cast iron
Chrome-molybdenum steel
Alloy steel + hard alloy
Chrome-molybdenum steel
Aluminum bronze
Flexible asbestos
Malleable cast iron


【Main appearance and connection size】
Nominal diameter
Main external dimensions and connection dimensions
L
D
D1
D2
b
Z-d
H
D0
Z41H-16C
15
130
95
65
45
14-2
4-Φ14
170
120
20
150
105
75
55
14-2
4-Φ14
190
140
25
160
115
85
65
14-2
4-Φ14
205
160
32
180
135
100
78
16-2
4-Φ18
270
180
40
200
145
110
85
16-3
4-Φ18
310
200
50
250
160
125
100
16-3
4-Φ18
358
240
65
265
180
145
120
18-3
4-Φ18
373
240
80
280
195
160
135
20-3
8-Φ18
435
280
100
300
215
180
155
20-3
8-Φ18
500
300
125
325
245
210
185
22-3
8-Φ18
614
320
150
350
280
240
210
24-3
8-Φ23
674
360
200
400
335
295
265
26-3
12-Φ23
811
400
250
450
405
355
320
30-3
12-Φ25
969
450
300
500
460
410
375
30-3
12-Φ25
1145
580
350
550
520
470
435
34-4
16-Φ25
1280
640
400
600
580
525
485
36-4
16-Φ30
1452
640
Z41H-25
15
130
95
65
45
16-2
4-Φ14
170
120
20
150
105
75
55
16-2
4-Φ14
190
140
25
160
115
85
65
16-2
4-Φ14
205
160
32
180
135
100
78
18-2
4-Φ18
270
180
40
200
145
110
85
18-3
4-Φ18
310
200
50
250
160
125
100
20-3
4-Φ18
358
240
65
265
180
145
120
22-3
8-Φ18
373
240
80
280
195
160
135
22-3
8-Φ18
435
280
100
300
230
190
160
24-3
8-Φ23
500
300
125
325
270
220
188
28-3
8-Φ25
614
320
150
350
300
250
218
30-3
8-Φ25
674
360
200
400
360
310
278
34-3
12-Φ25
811
400
250
450
425
370
332
36-3
12-Φ30
969
450
300
500
485
430
390
40-4
16-Φ30
1145
580
350
550
550
490
448
44-4
16-Φ34
1280
640
400
600
610
550
505
48-4
16-Φ34
1452
640

Inquiry

If you have any enquiry about quotation or cooperation,please feel free to email us at info@cnlgvalve.com or use the following enquiry form. Our sales representative will contact you within 24 hours. Thank you for your interest in our products.