Brass electric water heater safety valve is a safety and protective valve, mainly used in pipelines and various pressure-bearing equipment. When the working pressure of the medium exceeds the allowable pressure value, the brass electric water heater safety valve automatically opens to discharge the medium. As the pressure of the medium decreases, The brass electric water heater safety valve will be closed again to prevent the danger of overpressure in electric water heaters, Today we share the form and material, rated discharge capacity, working pressure range, precautions for installation, the use and management of brass electric water heater safety valves.

The form of the brass electric water heater safety valve is selected according to the loading method. Most of the containers with low working pressure and high temperature choose the lever type, and high-pressure containers generally use the spring type; according to the gas discharge method, if the medium in the container is toxic, 

For flammable and explosive gases or for refrigerants and other gases that will pollute the atmosphere, closed type should be used, and air or other harmless gases can be semi-closed or open; For medium and low pressure containers with large volume and little strength margin, full-open brass electric water heater safety valves can be used to reduce the opening area of the container. When the medium is air, water vapor and the brass electric water heater safety valve is required to be regularly opened for inspection, the one with a wrench should be used. For toxic, flammable and explosive media, unless there are special requirements, the one without a wrench should be used. When a wrench is required, a closed brass electric water heater safety valve with a wrench should be used.

If there are no special requirements for the valve body material of the brass electric water heater safety valve, when the nominal pressure of the valve is less than or equal to 1.6MPa, choose gray cast iron; when the nominal pressure is less than or equal to 2.5MPa, choose carbon steel; for corrosive media, choose stainless steel, Chromium molybdenum steel should be selected when the temperature is high.

The rated discharge capacity of the brass electric water heater safety valve must be greater than or equal to the safe discharge capacity of the container. The rated discharge capacity of the brass electric water heater safety valve can be checked from its nameplate.

When the safety valve of the brass electric water heater is opened, the valve flap opens rapidly and remains in the discharge state stably, and the maximum pressure in the container is always within the allowable pressure range of the container. After the pressure drops, the valve closes without a valve. lobe oscillations. If the rated discharge volume is too small, the pressure in the container will exceed the allowable pressure and cause danger, especially for the liquid medium with low compressibility.

 However, if the rated discharge volume is too large, because the discharge area is too large, the medium will be quickly discharged when the valve disc is opened, so that the pressure near the safety valve of the brass electric water heater in the container drops sharply to the seat pressure, and the just-raised valve disc is very It quickly falls back to the valve seat and closes with a violent impact. However, the high pressure far from the valve is not eliminated. When the pressure near the safety valve of the brass electric water heater rises to the opening pressure again, the valve flap opens again, and so on. The valve disc and sealing surface will be damaged, and it will also cause water hammer in the system when used in liquid media.

(1) The brass electric water heater safety valve should be directly connected with the container body and installed at the highest part of the container. The brass electric water heater safety valve on the liquefied gas storage tank should be installed in the gas phase space, and the brass electric water heater used for liquid is safe. The valve shall be installed below the normal liquid level, and the nominal diameter of the inlet pipe of the safety valve of the brass electric water heater shall not be less than 15mm. When it is difficult to install it on the container body due to special reasons, it can be considered to be installed on the outlet pipeline, but the pipeline between the installation place of the brass electric water heater safety valve and the container should avoid structures such as sudden turning and local shrinkage of the section to prevent the increase of pipes. Road resistance, causing dirt accumulation and blockage, etc.

(2) No matter where the brass electric water heater safety valve is installed, the cross-sectional area of the connecting pipe and the through hole of the pipe fitting between the container and the brass electric water heater safety valve shall not be less than the inlet area of the brass electric water heater safety valve. If a connection port is equipped with several brass electric water heater safety valves, the area of this connection port should be at least equal to the sum of the inlet areas of several valves, preferably 1.25 times the sum.

(3) It is generally forbidden to install an intermediate stop valve between the container and the safety valve of the brass electric water heater, but for containers containing flammable, toxic or viscous media, in order to facilitate the replacement and cleaning of the safety valve of the brass electric water heater , A stop valve can be installed between the container and the safety valve of the brass electric water heater, but the structure and diameter of the stop valve shall not hinder the normal discharge of the safety valve of the brass electric water heater. When the container is working normally, the stop valve must be Fully open and sealed.

(4) If there is a possibility of condensed liquid in the discharge pipe behind the safety valve of the brass electric water heater, an automatic removal facility should be considered; the inner diameter of the discharge pipe of the closed brass electric water heater safety valve shall not be smaller than the outlet of the safety valve of the brass electric water heater Nominal diameter of the tube. In principle, the discharge pipe should have one valve and one valve, and it is forbidden to install any valve on the discharge pipe. When two or more brass electric water heater safety valves share the same discharge pipe, the cross-sectional area of the discharge pipe should not be less than that of all brass electric water heater safety valves. The sum of the cross-sectional area of the valve outlet pipe, and the pressure drop of the discharge pipe should be properly considered, so that the brass electric water heater safety valve will not produce obvious back pressure. Do not share an exhaust pipe for flammable gases such as oxygen or other gases that can react chemically when mixed.

(5) Before installing the new brass electric water heater safety valve, its opening pressure and return pressure should be adjusted on the test bench, and the tightness of the closing parts should be checked. The opening pressure can be adjusted by adjusting the load on the valve disc, such as the weight or position of the lever-type brass electric water heater safety valve, and the position of the spring-type brass electric water heater safety valve compressing the nut of the spring (when the spring pressure is correctly selected The recoil force can be achieved by adjusting the position of the upper and lower adjusting rings of the safety valve of the brass electric water heater.

Proper selection and installation of the correct brass electric water heater safety valve should also play its role through reasonable use and management. In daily use, in order to ensure the good working condition of the brass electric water heater safety valve, the maintenance and inspection should be strengthened, the valve body should be kept clean, the valve body and spring should be prevented from rusting, and the valve body should be prevented from being blocked by grease and foreign matter, and the lead of the valve should be checked frequently. Check whether the seal is in good condition to prevent the heavy hammer of the lever-type brass electric water heater safety valve from loosening or being moved, and the spring-type brass electric water heater safety valve adjusting nut being arbitrarily twisted. If leakage is found, it should be replaced or repaired in time. Such as over-tightening the adjusting nut of the spring-type brass electric water heater safety valve, or adding weight to the lever of the lever-type brass electric water heater safety valve, etc.) methods to eliminate leakage. In order to prevent the valve disc and valve seat from being stuck by dirt such as grease in the gas, the brass electric water heater safety valve used for air, water vapor or other gases with sticky dirt but will not cause environmental pollution when discharged , the wrench should be pulled regularly to exhaust the work to flush out the dirt.

Brass electric water heater safety valve should be inspected regularly, including opening pressure, back seat pressure, sealing degree, etc. The requirements are the same as the debugging of brass electric water heater safety valve. When the inspection fails, it should be disassembled, and the parts should be carefully inspected for cracks, scars, wear, corrosion, deformation, etc., and repaired or replaced, and then assembled and then inspected. The periodic inspection cycle of the brass electric water heater safety valve can be the same as the inspection cycle of the container used.

Here is the end of Brass Electric Water Heater Safety Valve: Definition, Selection, Installation and Maintenance, from which you will learn the form and material, rated discharge capacity, working pressure range, precautions for installation, the use and management of brass electric water heater safety valves.