The steam boiler is a pressure vessel. A safety valve, a main steam valve and a secondary steam valve are set on the top of the boiler. The steam passes through the main steam valve and enters the steam pipe by the sub-cylinder. So, what is the role of the secondary steam valve?

Steam boiler cold furnace operation, heating pipes are required before steam is delivered, and the heating pipes are required to be carried out slowly. The steam produced by the main steam valve has a fast flow rate and a large flow rate, which is not suitable for heating pipes. Therefore, a secondary steam valve is installed next to the main steam valve, and the amount of steam entering the steam pipe is controlled by controlling the secondary steam valve to achieve the purpose of heating the pipe.

elaborated on the role of the auxiliary steam valve:

1. Protect the main steam valve

Compared with the steam pipe, the main steam valve of a steam boiler has a much larger thickness. When the main steam pipe is warmed, if the main steam valve is opened directly, the main steam valve is prone to large thermal stress due to uneven heating. If the auxiliary steam valve is opened when the pipe is warmed, and then the main steam valve is opened when the heating pipe ends, the main steam valve will be heated more evenly and the thermal stress generated will be small.

2. Protect the steam pipeline

After the main steam valve is opened, the steam flow is large and the flow velocity is fast. It is easy to damage the steam pipeline when it is used to heat the pipe. Therefore, opening the auxiliary steam valve to warm the pipe can avoid water shock and vibration caused by a large amount of steam suddenly entering the pipe when the pipe is warmed.

3. Easy to operate

During the heating process, the main steam valve is difficult to operate due to the large pressure gap before and after the main steam valve. By opening the bypass for heating pipes on the one hand, the valve is easier to open, and the wear of the valve sealing surface can be reduced. Moreover, the flow interface of the bypass valve is small, which makes it easier to control the heating pipe speed.

The steam boiler is a pressure vessel. The installation, adjustment and operation of the boiler should be standardized and correct to ensure the safe use of the boiler!