Crane for pressure gauge - features and purpose of this type

10-06-2018

Water supply

A manometric tap is an important element of any system in which constant monitoring of the pressure of the working medium is necessary. This element differs from conventional valves and performs several other functions. In this article we will consider the main design features of this product group, the scope of their application and the basic requirements for nodes.

In the photo: a distinctive feature of cranes for pressure gauges is the presence of a platform for the installation of the measuring device, it can have very different sizes and configuration

Scope of application

Such designs are used quite widely, but most often they are used in the following cases:

On heating boilers	This type of construction is characterized by an increased level of danger, so pressure control is of paramount importance. Using a three-way crane makes it easy to work
On communication networks	If the main instrument for measuring pressure is placed stationary, then the control instrument with which the data is compared with the main indicators. This option not only allows you to control the readings, but if necessary, temporarily use the pressure gauge as the main
To clean the siphon tube	To carry out this periodically necessary event, the easiest way is to install a crane on which you can put all the necessary instruments and blow a siphon tube
For periodic inspection	Another use case - if periodic monitoring of readings is not required, but from time to time you still need to remove the data, the crane will be the easiest solution.

Durable and reliable 11b18bk crane - exactly what you need when operating in difficult conditions with elevated temperatures

Design features

It should be noted that all such nodes produced in our country must comply with the standards of GOST, the choice of a specific regulatory act depends on the modification of the node. If the seller has documents confirming compliance with the standards, then the crane is reliable and can be used almost everywhere. (See also the article Water pipes: features.)

Operating principle

Three-way ball valve for pressure gauge has the following provisions:

In the first position, the measuring part of the gauge is connected to the working medium inside the pipeline. That is, in this position and measurement of indicators is made, therefore it is possible to call it working, everything is simple: when the necessary data are obtained, it is necessary to change the position to one of the following.
The second position - disconnection from the working environment, the measuring device is connected to the ambient air.. In this case, the readings should be 0, if this is not the case, then the pressure gauge has failed. In this position, the system is located overwhelmingly.

It is better to buy taps with a handle - it is very easy to determine in which position the node is at the moment, which is especially important for those who take readings with their own hands and do not have the appropriate qualifications

In the third position, the measuring unit is isolated from both working communications and from outside air, but the system interacts with the external environment, which allows purging siphon tubes in pressure gauges. This function is special, and you will hardly need to use it under normal conditions (especially since the instructions for carrying out the work are very complicated).
The crane has a fourth position, it is not working and is used only when connecting or disconnecting a pressure gauge. It can be said this is the mounting position.

Ball valves are the most popular and popular today, this is due to the low cost

Tip! In order to thoroughly understand the provisions, a specialist must do this for the first time, who will show the correct sequence of actions.

Criterias of choice

If you need to purchase a faucet for a pressure gauge yourself, then you should follow a few important recommendations:

It is necessary to know the purpose of use and features of operation: approximate pressure in the system, nature of the medium (gas, liquid, etc.), temperature range of operation. All this allows you to choose the option that suits your needs best.
It is also very important to purchase a quality product, the strength characteristics of which meet the highest requirements. Typically, the body is made of steel or brass, its thickness should be quite large - this indicates the reliability of the site and its resistance to stress. The price is an indicator of quality, you should not get the most budget solution, because most often its characteristics are not very good.

Note! Some systems require non-standard type devices, they can be purchased from specialized companies. As a rule, in such cases, all the necessary parameters are determined at the design stage, which allows you to take care of ordering the necessary nodes in advance.

The massive body with thick walls indicates high reliability of the crane

Another very important parameter is the fastening method; the threaded connection of pipes is most often used, but its parameters can be different. For example, on the one hand there may be an external thread, and on the other, an internal thread, all this should be foreseen in advance so that you do not have to redo the system or return and replace the assembly. In addition, do not forget about the parameters of the thread - they can be different.
Finally, the last important factor is the type of crane. Here we can distinguish two main options - the classic ball, featuring high reliability, simplicity and low cost, and a more advanced push-button, which, although worth more, is distinguished by its ease of operation.

The difference between a button tap is that the pressure gauge removes pressure from the system only when the button is pressed, at other times it is disconnected from it

Conclusion

Valves for pressure gauge is an important element of the system, allowing to monitor the performance of the main measuring units. The video in this article will tell some important points in more detail.