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Structural management of Needle Valve

November 19, 2024
The Needle Valve is one of the three indispensable safety accessories on the boiler. It plays an important role in controlling the internal pressure limit of the boiler and the safety protection of the boiler. When the pressure in the boiler rises to a value exceeding the specified value, the Needle Valve automatically opens to relieve pressure and discharge steam.
Manual needle valve
When the pressure in the boiler drops to the specified value, the Needle Valve automatically closes. If the Needle Valve is improperly selected or the adjustment does not meet the use requirements, it is easy to cause overpressure and even explosion accidents in the boiler. Therefore, correctly understanding and using Needle Valve is an important part of boiler safety management.
The Universal Valve uses the adjustment of the tightness of the spring to control the size of the exhaust pressure. This Needle Valve has a compact and light structure and can withstand vibration without leaking. It is the most commonly used Needle Valve on boilers. However, since the elasticity of the spring changes due to factors such as temperature and time, the reliability is poor, and the Needle Valve must be inspected regularly during use.
When the steam pressure acting on the valve disc is less than the weight pressure acting on the Valve Stem, the valve disc is pressed against the valve seat again to keep the boiler running. The opening pressure of the Universal Valve is controlled by adjusting the distance between the weight and the fulcrum.
After the opening pressure of the Needle Valve is determined, the distance of the weight fulcrum can be calculated using the lever principle to determine the position of the weight. The Universal Valve has a simple structure, is easy to adjust, has a flexible action record, and is relatively accurate and reliable. However, the weight is relatively heavy, the exhaust capacity of a single Needle Valve is limited, and the installation requirements are also relatively strict.
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