Views: 0 Author: Site Editor Publish Time: 2021-08-30 Origin: Site
The lug-style butterfly valves, unlike the wafer-style, carry the weight of the piping through the valve body. Lug type butterfly valve allows dead-end service or removal of downstream piping. Lug type butterfly valve is preferred if a valve may be required to remain in place in closed position on removal of the pipe on one side for a temporary operation. Lug butterfly valve must be flanged for bolting to a pipe flange on the other side.
What are the functions of lug butterfly valve?
How to install lug butterfly valve?
How to clean lug butterfly valve?
Lug butterfly valve retains a seal to protect against dual-directional pressure differential in the flow of fluid. In other words, the lug version of lug butterfly valves was designed to hold a tight seal, safeguarding against bi-directional pressure differential in order to avoid any backflow in systems that have been manufactured for uni-directional flow. This is accomplished by using a tightly fitted seal, such as an O-ring, gasket, precision machined, along with a flat valve face on the downstream and upstream sections of the valve.
l Flow regulation: flow can be easily controlled or regulated simply by turning the wheel of lug butterfly valve. Using a flow controller the process can be automated.
l Flow isolation
l Prevention of backflow: lug butterfly valves can be used for backflow prevention in some situations.
The lug type butterfly valve and the lug-on butterfly valve are in the same valve form. They are just different names. Lug butterfly valves have the advantage that the distance between the pipes at both ends is short. The "lug" here refers to the valve connecting the pipe flanges at both ends with a gold hoop. The lug type butterfly valve is a butterfly valve that is distinguished according to the connection method. The butterfly valve is connected by a flange type butterfly valve or a welded butterfly valve. Some small-diameter butterfly valves have lugs and some are not, which is determined by the design of each manufacturer. However, the large-diameter butterfly valve generally has a lug.
When the lug type butterfly valve and the pipe are installed, the flanges of the two sides are respectively installed with bolts. The sealing surfaces of the lug butterfly valve body and the valve body are not squeezed by the bolts, which is beneficial to the sealing life.
The lug type butterfly valve can be easily installed in the discharge position.
The lug-type bolts are relatively short and do not need to pass through the entire lug butterfly valve body. This avoids the defects that the valve bolts are relatively long and the creep is large and easy to leak.
According to the processing requirements, some parts of lug butterfly valve need to be polished, and the surface must not have processing burrs.
All parts of the lug butterfly valve are degreased.
Pickling passivation is carried out after degreasing, and the cleaning agent does not contain phosphorus.
Rinse with pure water after pickling and purification, and there should be no residues of chemicals. This step is omitted for carbon steel parts of lug butterfly valve.
Use non-woven cloth to dry the parts one by one. Do not leave the surface of the parts such as wire bristles, or blow dry with clean nitrogen.
Use non-woven fabric or precision filter paper dipped in analytical pure alcohol to wipe each part until there is no dirty color.
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