According to building codes, when installing pipelines transporting hot, cold water, steam and other media, it is required to install a three-way valve for a pressure gauge.
It provides the ability to test and disable the meter. The valve allows you to relieve pressure, blow through the outlet, which prevents the arrow from sticking, increases the accuracy of its readings. Lack of fittings can lead to an accident and serious damage to pipelines.
The raw material for the manufacture of bodies of three-way valves is brass, which can withstand significant loads. It is resistant to wear, aggressive substances, high temperatures, and is not prone to corrosion.
There are the following types of three-way valves:
- Cork tension. It has a simple design, represented by four modifications. Among the disadvantages of such fittings is the possibility of tearing off the plug shank due to insufficient metal hardness, the need to apply significant effort.
- Ball with drainage. The valve has a compact size, is not prone to accumulation of debris in the flow zones, has a high degree of tightness and ease of operation. Can be used in stagnant areas. Management is carried out using a handle in the form of a lever.
- Button. Allows to avoid constant pressure of the medium on the working mechanism of the measuring device. Measurements are carried out by pressing a button.
To connect three-way valves for pressure gauges to pipelines, external and internal threads are used. This method of fastening ensures the reliability of fixing the fittings, dismantling during replacement without destroying the communications section.
Three-way valves for pressure gauges retain their functionality for a very long time. They are also characterized by:
- low coefficient of hydraulic resistance;
- reliability, structural strength;
- ease of installation, maintenance, which do not require the use of special equipment.
Three-way valves can be in several positions. In the first case, when a pressure gauge is connected to communications, the pressure of the transported medium is measured. If the device does not have access to the pipeline and is connected to the external air, the indicators always correspond to zero. Another provision is required when connecting a test measuring device to the main pressure gauge.
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