Today we Flow Measurement Instrument Manufacturer come to summarize Eccentric hemisphere valve safety use inspection process.
Eccentric hemispherical valve manufacturer’s good self-sealing safety use inspection process
Eccentric hemispherical valve manufacturers have good self-sealing: due to the use of eccentric crankshaft, the valve has a good self-sealing. Due to the eccentricity, when the valve is closed, the pressure F of the water in the valve causes the spherical cap to have a counterclockwise moment about the axis of the crankshaft so that the spherical cap is tightly pressed against the valve seat. The greater the water pressure, the greater the closing force. That is, it has good self-sealing.
The eccentric principle of the eccentric hemispheric valve manufacturer is as follows: the eccentric crankshaft is used so that the center line of the spherical cap is offset from the centerline of the valve flow passage by an eccentricity. When the valve is opened, the crankshaft rotates through a small angle, the spherical crown will leave the valve seat, and the spherical cap and the valve seat are no longer in contact; otherwise, during the closing process of the valve, only the closing moment, the spherical crown and the valve seat contact. This construction provides adequate protection of the crown and seat, minimizing wear and extending valve life.
The process of storage, installation, use, and inspection of eccentric hemispherical valve manufacturers:
1, eccentric hemisphere valve manufacturers to keep
a. The eccentric hemispherical valve manufacturer shall keep it in a dry, ventilated room, place it neatly, and the valve stem shall not be stressed.
b. During storage of the eccentric hemispherical valve manufacturer, the stem and machined surface are coated with a rust preventive that is easy to remove.
c. If the value of the eccentric hemispherical valve manufacturer is stored for a long time, it should be inspected regularly to eliminate surface dirt and rust. The rustproof oil needs to be applied to the processing surface.
d. Electric valves and pneumatic valves should be handled with care and kept dry to prevent contact with corrosive substances to avoid damage to electrical components and mechanical parts.
2, eccentric hemisphere valve factory installation
a. The eccentric hemispherical valve manufacturer can be installed in any position, but it must be convenient for inspection and operation.
b. Before installation, carefully check whether the valve type, pressure, and caliber meet the requirements, and confirm that it can be installed.
c. Install the valve to clean the inner cavity and sealing surface, check the sealing surface, bolt connection, packing compression, and whether the valve stem rotates freely.
d. When installing, the valve body is marked with an arrow symbol, indicating that the valve is suitable for a one-way pressurized pipeline. The direction of the arrow should be kept consistent with the flow direction of the pipeline medium during installation. Tighten the connecting bolts evenly and symmetrically when connecting the pipes.
e. The ball valve is in the fully closed position, the valve position opening and closing degree are debugged and positioned. The operating system positioning device should not be adjusted at will. The electric valve should be opened to 45 degrees by the manual device before installation and commissioning. Debug the position of the valve switch to avoid damage to the valve components due to misoperation (see the electric product manual for details on operation and maintenance of the electric device).
f. After installation, the valve shall be fully open for pipe purge and system pressure test.
3, eccentric hemisphere valve manufacturers use
a. The operating conditions of the eccentric hemispherical valve manufacturer must be consistent with the specifications on the nameplate and the instruction manual.
b. The eccentric hemispherical valve manufacturer can only be used for opening and closing, shutting off the valve, and rotating the valve stem by 90 degrees.
c. When opening the valve, use the dead point of the positioning block as the full open mark, that is, the open position as its fully open or fully open position.
4, eccentric hemisphere valve manufacturers check
The valve should be inspected regularly during the use of the following items, and the problem should be repaired in time.
a) Whether the fasteners are evenly sturdy.
b) Whether the packing is seriously worn and the gasket is damaged (parking overhaul).
c) Whether the drive is light and flexible.
d) Whether the valve stem is severely worn or deformed.
e) Whether the sealing surface is damaged or severely worn (parking overhaul).
f) Whether there is leakage at the joint between the valve seat and the valve body (parking overhaul).
g) Whether the casing is seriously corroded or worn, resulting in a significant thinning of the casing and even leakage. If these phenomena occur, they should be scrapped (parking overhaul).
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