Seek the internal structure of the diaphragm head in thin-film control valves
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Thin-film control valve; I need a diagram of the internal structure of the diaphragm head, thank you.
There are many people who make these diaphragm heads; you’ll probably not be able to find pictures of them. The pneumatic diaphragm head consists of an upper cover, a lower cover, a diaphragm cover gland, a diaphragm, a tray, a spring push rod, and a spring. The structure of this product is quite simple; when selecting it, pay attention to the pressure range of the spring based on the instrument air pressure – it should normally be between 80-240 KPa.
The diagram below shows the structure of the SAMSON 3271 diaphragm head; the left and right sides depict the structures of the different failure locations (FO/FC). The membrane head structures of various brands are similar, with differences mainly in the magnitude of thrust (the size of the membrane head, as well as the elasticity and quantity of springs), and the series connection of membrane heads. For routine preventive maintenance, attention should be paid to: waterproofing of exhaust ports, as well as checking for spring corrosion and aging of rubber diaphragms in environments with acidic gases. The attachment is for reference.