Three-way valve for manometer


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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