Fully Welded ball valves with integral welded valve bodies can effectively avoid external leakage. Welded ball valve is widely used in various fields, its superior quality and high performance stability is ordinary cast steel ball valve can not reach, all-welded ball valve service life is far greater than cast steel ball valve, all-welded ball valve is widely used in city gas, city heating, petrochemical, shipbuilding, steel, pressure regulating stations, power plants and other types of pipeline equipment.
Welded ball valves are generally available in blue, yellow, grey, black and other colours. Transmission methods include handle, worm gear, pneumatic, electric, etc.
- Fully welded housing;
- Trunnion mounted ball;
- Spring-loaded seat rings;
- Metallic or soft seals;
- Double Block and Bleed"-version;
- Full or reduced bore;
- Flanged, welded or threaded connections;
- Blow-out proof shaft;
- Shaft seals replaceable under full pressure in open and closed position;
- No static charging;
- Maintenance-free bearings;
Trunnion ball valve manufacturer designs their trunnion ball valve to work in a way similar to a floating ball valve. The working principle of a trunnion ball valve involves rotating the ball to control fluid or gas flow. When the actuator sends a signal to the stem, it rotates the ball by 90 degrees, opening or closing the valve. The seat ensures that the ball stays in place during rotation.
The injection system acts as a partial seal to prevent leakage when it occurs. To start the oil flow in a trunnion ball valve, the actuator on the valve is rotated 90 degrees, usually clockwise. The actuator is connected to the valve stem, which is linked to the ball. The rotation of the actuator moves the stem and the ball connected to it. This will result in an unrestricted flow of the substance in the pipe, and reduced pressure in the pipeline. This will restrict flow of the substances in the pipeline.
- Body: The valve body is the outer shell of the valve that holds all the internal components in place. It can be made of various materials such as stainless steel, carbon steel, or low-temperature carbon steel. The body is typically constructed with flanged, butt-welded, or threaded ends to connect the valve to the pipeline.
- Ball: The ball is a rotating disk that starts or stops the flow of fluid or gas in the valve. It is usually made of materials such as stainless steel, carbon steel, or brass. The ball is designed with a hole in the center to allow fluid or gas to pass through when it is in the open position.
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- Seat: The seat is a ring-shaped component that surrounds the ball and ensures that it stays in place when the valve is in operation. It is typically made of soft or metal materials such as stainless steel. The seat creates a seal between the ball and the valve body to prevent leakage.
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- Trunnion: The trunnion is an additional shaft that holds the ball in place and prevents it from moving from below. It is attached to the ball disk with the help of welded joints. The trunnion is usually made of stainless steel or carbon steel.
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- Stem: The stem connects the actuator to the ball and ensures that they move together. It is usually made of stainless steel, carbon steel, or brass. The stem is attached to the ball with the help of a ball joint or other connection methods.
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- Injection System: The injection system is present in the stem and seat area and acts as a partial seal to prevent leakage when it occurs. It is typically made of soft and is designed to be replaceable.
Materials of parts
| 1 |
Body |
12 |
Ball lubricating bearing |
| 2 |
Left-right body |
13 |
Screw |
| 3 |
Ball |
14 |
Bonnet gasket |
| 4 |
Seat |
15 |
Support cover |
| 5 |
Sealing ring |
16 |
Die holder |
| 6 |
O-ring |
17 |
Packing |
| 7 |
Stem |
18 |
Terminal pad |
| 8 |
Seat grease injection valve |
19 |
Spring pin |
| 9 |
Spring |
20 |
Flat key |
| 10 |
straight pin |
21 |
Stem gasket |
| 11 |
Blow-down vavle |
22 |
Static-free spring |
Materials of parts
| Body |
20#/A105/LF2/F304/F316/F304L/F316L/F11/F22/F51 |
| Ball |
20#+Hcr/A105+ENP/LF2+ENP/F304/F316/F304L/F316L/F51 |
| Seat |
A105+ENP/LF2+ENP/F304/F316/F304L/F316L/F51 |
| Stem |
2Cr13/A105+ENP/LF2+ENP/F304/F316/F304L/F316L/F51 |
| Sealing ring |
PTFE/NYLON/PEEK/EFLON |
| O-ring |
VITON/NBR |
| Screw |
B7M/B8M/L7M/B16M |
| Support cover |
A105+ENP/LF2+ENP/F304/F316/F304L/F316L/F51 |
| Die holder |
A105+ENP/LF2+ENP/F304/F316/F304L/F316L/F51 |
| Spring |
17-4PH/17-7PH/Inconel |
| Bearing |
304+PTFE/316+PTFE |
| Gaske |
Flexible graphite+304/PTFE |
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