What is the difference between a hot water meter and a cold water meter?

Definition of cold water meter.

Water meter can be divided into cold water meter and hot water meter according to the temperature of the medium, and the water temperature of 30 ℃ is its dividing line cold water meter: the lower limit temperature of the medium is 0 ℃, the upper limit temperature of 30 ℃ water meter.

 

Definition of hot water meter.

Hot water meter is a temperature measuring instrument. Hot water meter media lower limit temperature of 30 ℃, the upper limit of 90 ℃ or 130 ℃ or 180 ℃ water meter.

The main control parameters selected for the hot water meter are the flow rate of the meter, common flow rate, overload flow rate, minimum flow rate, demarcation flow rate, nominal pressure, maximum allowable working pressure, pressure loss, etc.

 

 

What is the difference between hot water meter and cold water meter?

1, the appearance of different colors: cold water table for blue, hot water table for red.

2, the scope of application is different: cold water meter for cold water, refers to the lower limit of the medium temperature of 0 ℃, the upper limit of the temperature of 30 ℃ water meter. Hot water meter for hot water, that is, the lower limit temperature of the medium for 30 ℃, the upper limit of 180 ℃.

3. Different degrees of heat resistance: hot water meter can run cold water, cold water meter can not run hot water. The heat resistance of the hot water meter is generally 100 degrees, some can even reach 200 degrees, and the cold water meter can reach 30 degrees.

4, hot water table for hot water, mostly used for ordinary household water meter: water meter is a household, the necessary cumulative measurement of legal instruments in various industries.

 

 

Selection points.

(1) the selection of water meters need to first consider the working environment of the water table: such as water temperature, working pressure, working time, measurement range and water quality conditions on the water table selection, and then according to the design flow through the water table to produce a water table pressure loss close to and not exceed the specified value to determine the water meter caliber. In general, the nominal diameter is not greater than DN50, should use the rotary water meter; nominal diameter greater than DN50, should use the screw-wing water meter; water meter flow changes a lot should be used when the compound water meter.

(2) nominal diameter of the water meter is not greater than DN50, should be selected according to the design of the water system seconds flow.

(3) it is appropriate to give priority to the use of dry water table. In the country's non-heating areas, and the limit of the minimum temperature below -4 ℃, the indoor public part of the sub-water table or adjacent to the northwest side of the outer wall of the water table should be used dry water table. Such as the use of wet water meter should do insulation treatment.

 

Installation requirements

(1) water meter should be prevented from shock or vibration around the installation site to cause the risk of damage.

(2) The water meter should not be subject to excessive stress caused by the pipe and fittings. When required, the water meter should be mounted on a base or bracket. In addition, the upstream and downstream of the water pipe should be properly fastened to ensure that when the water meter is removed or unloaded on one side, the impact of dry water does not cause the facility parts to move

(3) The water meter should be protected from the risk of damage caused by the extreme temperature of the water and surrounding air.

(4) water meter well should be protected from flooding and rain.

(5) The direction of the water meter should be consistent with its type.

(6) The water meter should be prevented from the danger of damage caused by external environmental corrosion.

(7) should always comply with the effective national laws and local regulations regarding the use of water pipes as grounding. The water meter as an electrical grounding components, in order to minimize the risk to the operator, the water meter and its connection fittings should be permanently bypassed.

(8) To prevent damage to the water meter caused by adverse hydraulic conditions (cavitation, surge and water hammer), preventive measures should be taken.

(9) when needed, measures should be taken to avoid sudden changes in the flow section close to the water meter.

(10) special requirements for the installation of screw-wing water meters (also known as Voltmann water meters): this water meter is sensitive to upstream flow disturbances, which cause large errors and advance wear. The flow is subject to two types of disturbance; velocity distribution distortion and vortex. Typical velocity distribution distortions are caused by obstacles that partially block the pipe, such as the presence of a partially closed valve, but this effect can be easily minimized. Vortex is mainly caused by two or more elbows in different planes, this effect can be controlled by ensuring a certain length of straight pipe section upstream of the water meter; if this is not possible, a straightening device is installed.

 

 

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