Most of the forged steel Industrial valve pipe Manufacturers use flange connection, which can be divided into the following types according to the shape of the connection surface: 1. Lubrication type: for forged steel valves with low pressure. Processing is more convenient 2. Concave-convex type: higher operating pressure, medium-hard gaskets can be used 3.
Tongue and groove type: gaskets with greater plastic deformation can be used, which are widely used in corrosive media and have better sealing effects. 4. Trapezoidal groove type: Use an oval metal ring as a gasket, which is used for valves with operating pressure ≥64 kg/cm², or high temperature valves. 5. Lens type: The washer is in the shape of a lens and is made of metal. Used for high-pressure valves with operating pressure ≥100 kg/cm², or high-temperature valves. 6. O-ring type:
This is a relatively new flange connection method. It is developed with the appearance of various rubber O-rings. It is a small connection method for sealing. The maintenance of forged steel valves should pay attention to the details: 1. Forged steel valves should be stored in a boring and ventilated room, and the two ends of the passage should be blocked. 2. Forged steel valves should be checked regularly, and the dirt on them should be removed, and anti-rust oil should be painted on their appearance. 3.
The forged steel valve after the device is applied should be repaired regularly to ensure its normal operation. 4. Check whether the sealing surface of the valve is worn or not, and repair or replace it according to the condition. 5. Check the wear condition of the trapezoidal thread of the valve stem and the valve stem nut of the forged steel valve, whether the packing is out of date and invalid, etc., and replace it if necessary. 6.
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