Q47N large diameter forged steel ball valve

Detailed description of large diameter forged steel ball valve:

Large-caliber forged steel ball valves are mainly used in pipelines of various systems in thermal power plants to cut off or connect pipeline media. Applicable medium: non-corrosive medium such as water and steam. Compared with other valve products, forged steel valves are characterized by high temperature forged steel and unique self-sealing design. The higher the pressure, the more reliable the seal. Due to the special performance, technical characteristics and working conditions, the product has formed characteristics that other products cannot replace.

Note: The model represents the meaning

Q stands for ball valve 3 stands for worm gear 4 stands for flange connection 7 stands for fixed type N stands for nylon

1. Features of large diameter forged steel ball valve

Large-caliber forged steel ball valves are mainly used in pipelines of various systems in thermal power plants to cut off or connect pipeline media. Applicable medium: non-corrosive medium such as water and steam. Compared with other valve products, forged steel valves are characterized by high temperature forged steel and unique self-sealing design. The higher the pressure, the more reliable the seal. Due to the special performance, technical characteristics and working conditions, the product has formed characteristics that other products cannot replace. Large-diameter forged steel ball valves often overlook the issue of grease injection. After the grease injection gun is refueled, the operator selects the valve and the grease injection connection method for the low-temperature stop valve, and then performs the grease injection operation. There are two forged steel gate valves: on the one hand, the amount of grease injection is small, and the grease injection is insufficient, and the sealing surface is worn faster due to lack of lubricant. On the other hand, excessive fat injection causes waste. The reason is that there is no accurate calculation of the sealing capacity of different valves according to the valve type category. The sealing capacity can be calculated based on the valve size and type, and then a reasonable amount of grease can be injected.

2. Maintenance of large diameter forged steel ball valve

The ball valve is generally in the open position during maintenance. In special circumstances, it is selected to close for maintenance. Other valves cannot be treated as open positions.

For the forged steel extension gate valve, observe the problem that the valve diameter is flush with the seal ring seat. For example, for ball valves, if there is an open position interference, the open position limiter can be adjusted inward to confirm that the diameter is straight and locked. Adjusting the limit can not only pursue the opening or closing position, but should be considered as a whole. If the opening position is flush and the closing position is not in place, the valve will not close tightly. In the same way, if the adjustment is in place, the adjustment of the open position should also be considered. Forged steel forged steel ball valve ensures the right-angle stroke of the valve. After grease injection, be sure to seal the grease injection port. Avoid the entry of impurities, or the oxidation of lipids at the grease injection port, and the cover should be coated with anti-rust grease to avoid rust. So that it can be applied in the next operation.

Forged steel cryogenic valves should consider the specific treatment of specific problems in the future sequential transportation of oil products. In view of the different qualities of diesel and gasoline, the scour and decomposition ability of gasoline should be considered. In the future valve operation, when encountering gasoline segment operations, replenish grease in time to prevent wear. When injecting grease, do not ignore the grease injection on the stem of the large-diameter forged steel ball valve. There is a sliding sleeve or packing on the valve shaft, which also needs to be kept in a lubricated state to reduce the frictional resistance during operation. If lubrication cannot be ensured, the torque will increase during electric operation and wear parts will be laborious during manual operation.

Some ball valves are marked with arrows. If there is no English FIOW writing, it is the direction of the seal seat, not as a reference for the flow direction of the medium, and the direction of the valve's self-discharge is opposite. Under normal circumstances, a double-seat sealed ball valve has a bidirectional flow direction.

When maintaining the valve, pay attention to the water ingress in the electric head and its transmission mechanism. Especially in the rainy season the infiltration of rainwater. One is to rust the transmission mechanism or the transmission shaft sleeve, and the other is to freeze in winter. The forged steel forged steel ball valve causes excessive torque during the operation of the electric valve, and damage to the transmission components will cause the motor to be unloaded or the over-torque protection will be tripped and electric operation cannot be realized. The transmission parts are damaged, and manual operation cannot be performed. After the over-torque protection is activated, manual operation also cannot be switched. Forcible operation will damage the internal alloy parts.

Both steel and iron are alloys based on iron and carbon as the main additive element, collectively referred to as iron-carbon alloys.

The cast iron is smelted in an iron melting furnace to obtain cast iron (liquid), and the liquid cast iron is cast into castings. This kind of cast iron is called cast iron.

What is the difference between large-diameter forged steel ball valve and cast steel and carbon steel. First of all, steel is classified by chemical composition

(1) Carbon steel: a. Low carbon steel (C≤0.25%); b. Medium carbon steel (C≤0.25~0.60%); c. High carbon steel (C≤0.60%).

Steel is classified according to the forming method: (1) Forged steel; (2) Cast steel; (3) Hot rolled steel; (4) Cold drawn steel.

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