big cok xxx,b grade porn,tabbu boobs

sexx vi

Ten common misunderstandings about installation of valves that are easily overlooked are listed in this article, which are as follows:
1. The bolt are too long.
For the bolts on the valve, only one or two threads should exceed the nut. The risk of damage or corrosion can be reduced. Why do you buy a bolt longer than you need? Usually, the bolt is too long because some people do not have time to calculate the correct length, or the individual does not care what the final result looks like.
2. The control valve are not isolated. 
Although isolating a valve occupies valuable space, it is important to allow the operator to work on the valve when maintenance is required. If space is limited and a gate valve is considered too long, at least install a butterfly valve which hardly takes up any space.
3. No pressure gauges or devices are installed.
Some utility programs like to calibrate the tester. These facilities usually provide staff with connection testing equipment, but some equipment even install the interface of accessories. Although it is not specified, it is designed so that the actual pressure of the valve can be seen. Even there are supervisory control, data acquisition (SCADA) and telemetry capabilities, someone can stand next to the valve at a certain point and know what the pressure is. That is so convenient.
4. The installation space is too small.
When a valve is installed, don't try to reduce the installation space in order to save costs. It will be very difficult to perform basic maintenance at a later stage. One thing to keep in mind, the tool can be very long, so it is necessary to preserve some space so that the bolt can be loosened, which allows you to add devices later.
5. Later disassembly is not considered. 
Most of the time, connecting everything together in a concrete room without some type of connection is not good. If all the parts are tightened tightly and there is no gap, it will be almost impossible to separate them. Whether it is a grooved coupling, a flange joint or a pipe joint, it is necessary to reserve some space. In the future, it may sometimes be necessary to remove components; reserving some space should be paid attention to.
6. Install concentric reducers horizontally.
The eccentric reducer can be installed horizontally, while the concentric reducer should be installed perpendicularly.
7. The air is not discharged.
When the pressure drops, air is discharged from the suspension liquid and transferred to the pipeline, which will cause problems downstream. A simple bleed valve will get rid of any air that may occur and prevent downstream problems. The bleed valve upstream of the control valve is also effective because the air in the pipeline may cause instability. Why is the air not removed before it reaches the valve?