High temperature and high pressure safety valve

I. Introduction:
High-temperature and high-pressure safety valve is a safety protection valve. Its disc is normally closed under external force. When the medium pressure in equipment or pipelines rises and exceeds the specified value, it will automatically open, discharging the medium out of the system to prevent the medium pressure in pipelines or equipment from exceeding the specified value. High-temperature and high-pressure safety valves belong to the category of automatic valves, mainly used in boilers, pressure vessels and pipelines to control pressure not exceeding the specified value, playing an important protective role in personal safety and equipment operation. Its function is that when the pressure inside the vessel exceeds a certain value, the high-temperature safety valve automatically opens the valve relying on the pressure of the medium itself, and then quickly discharges a certain amount of medium. When the pressure inside the vessel drops to the allowable value, the high-temperature safety valve automatically closes again, keeping the pressure inside the vessel always below the upper limit of the allowable pressure and automatically preventing accidents that may occur due to overpressure. Therefore, high-temperature and high-pressure safety valves are also known as the final protection device for pressure vessels.

II. Parts;

III. External Dimensions:

IV. Product Maintenance:
(1) Valve Cleaning: For cleaning general media, it can be washed with water. However, for cleaning media harmful to health, first understand their properties, then select the appropriate cleaning method.
(2) Valve Disassembly: First remove rust from parts with rust on exposed surfaces. Before rust removal, protect the machined surfaces of precision parts such as the valve seat, valve core, valve stem and push rod. Special tools shall be used for disassembling and assembling the valve seat.
(3) Valve Seat: If there are small rust spots and wear on the sealing surface, it can be repaired by machining. If damaged severely, it must be replaced. No matter the hard sealing surface after repair or replacement, it must be ground.
(4) Valve Stem: If the surface is damaged, it can only be replaced.
(5) Damage to Push Rod, Guide and Sealing Surfaces: For reverse-acting actuators, they must be replaced. For direct-acting actuators, they can be used after proper repair.
(6) Compression Spring: If there are defects such as cracks that affect strength, it must be replaced.
(7) Wearing Parts: Packing, sealing gaskets and O-rings shall all be replaced during each maintenance. Check whether there are cracks, aging or corrosion traces on the valve core and diaphragm that may occur in the future. Decide whether to replace them based on the inspection results. Generally, the service life of the diaphragm is 2 to 3 years.
(8) During valve assembly, pay attention to centering. Tighten the bolts diagonally, and add lubricating oil to the sliding parts. After assembly, adjust and debug according to the product's factory test items and methods. During this period, the packing compression force and the closing position of the valve core can be accurately adjusted.