The piping system must be flushed before installing the steam regulator. Anti-welding slag, oxide scale and other helium flow into the valve to destroy the sealing surface of the steam relief valve, affecting the normal operation of the valve.
Steam pressure reducing valve should be installed in a place convenient for operation and maintenance, and it must be installed on a horizontal pipeline. It should be noted that the flow of medium in the pipeline should be the same as the direction shown by the arrows on the ball valve, hydraulic control valve and valve body. Equipment. The steam medium valve must be installed upside down. The condenser that comes with it must be higher than the actuator so that the actuator can fill the condenser and protect the diaphragm. Extended service life.
When the steam pressure reducing valve is installed and used, the condenser should be filled with cold water, the shutoff valve of the bypass pipe should be opened, and the mixture of condensed water and soft drinks in the pipeline should be excluded to prevent the water and garbage from being damaged when the pressure reducing valve is opened. Pressure reducing valve, when there is no abnormal phenomenon, slowly turn the adjusting screw clockwise, adjust the outlet pressure to the required pressure (based on the gauge pressure after the valve), after adjustment, tighten the lock nut back, screw on protecting mask.
Filters should be installed before the pressure reducing valve to prevent debris in the medium from entering the pressure reducing valve and affecting its performance.
There should be a straight pipe before and after the installation of the pressure reducing valve. The length of the straight pipe before the valve is about 600 mm, and the length of the straight pipe behind the valve is about 1 mm.
General pressure reducing valve requires that the pressure difference between inlet and outlet must be ≥ 0.2Mpa.
Relief valves usually have DN15 ~ DN400 and other specifications, the valve before and after the working pressure is <1MPa and 0.1 ~ 0.5MPa, the pressure range error of ± 5% ~ 10%.
Troubleshooting The pressure behind the valve is unstable and changes as the pressure changes before the valve; cause;
1, the valve core is stuck in the foreign body;
2; Stem, push rod stuck;
3; The method of plugging the inlet pipe
1; re-installed to remove foreign matter 2, re-adjust;
3, after the valve is unblocked, the pressure drop does not come down, always changes above the demand value; cause;
1; set the spring stiffness is too large 2, the valve diameter is too large 3, the pressure before the valve is too high, the pressure reduction ratio is too large Exclusion method:
1, replace the spring 2, replace the smaller diameter 3, the valve before the pressure: the valve after the pressure exceeds 10:1 should be 2 step pressure valve after the pressure rise does not go up, always under the demand value changes; cause;
1; set the spring stiffness is too small 2, the valve diameter is too small 3, decompression ratio is too small Exclusion method:
1, replace the spring 2, replace the larger diameter 3, the valve before the pressure: the valve after the pressure is less than 1.25, should increase the pressure before the valve before the valve can not rise, always below the demand value action; cause;
1; set the spring stiffness is too small 2, the valve core is stuck in the foreign body;
3; Stem, push rod stuck;
4; spool, valve seat damage, leakage is too large 5, the valve diameter is too large to eliminate the method;
1; replacement of the spring 2, re-installation 3, re-adjustment 4. re-grinding or replacement 5, the pressure drop before replacing the smaller-diameter valve can not go, always above the demand value of the cause of the action;
1, set the spring stiffness is too large 2, the valve diameter is too small 3, spool, stem, push rod, etc. stuck exclusion method:
1, replace the spring 2, replace the larger diameter 3, eliminate the cause of stuck, re-adjust the valve pressure or valve pressure fluctuations occur too often 1, the valve diameter is too large 2 actuator capacity is too small Exclusion method:
1, choose the appropriate valve diameter 2, add dampers in the inlet pipe
Steam pressure reducing valve should be installed in a place convenient for operation and maintenance, and it must be installed on a horizontal pipeline. It should be noted that the flow of medium in the pipeline should be the same as the direction shown by the arrows on the ball valve, hydraulic control valve and valve body. Equipment. The steam medium valve must be installed upside down. The condenser that comes with it must be higher than the actuator so that the actuator can fill the condenser and protect the diaphragm. Extended service life.
When the steam pressure reducing valve is installed and used, the condenser should be filled with cold water, the shutoff valve of the bypass pipe should be opened, and the mixture of condensed water and soft drinks in the pipeline should be excluded to prevent the water and garbage from being damaged when the pressure reducing valve is opened. Pressure reducing valve, when there is no abnormal phenomenon, slowly turn the adjusting screw clockwise, adjust the outlet pressure to the required pressure (based on the gauge pressure after the valve), after adjustment, tighten the lock nut back, screw on protecting mask.
Filters should be installed before the pressure reducing valve to prevent debris in the medium from entering the pressure reducing valve and affecting its performance.
There should be a straight pipe before and after the installation of the pressure reducing valve. The length of the straight pipe before the valve is about 600 mm, and the length of the straight pipe behind the valve is about 1 mm.
General pressure reducing valve requires that the pressure difference between inlet and outlet must be ≥ 0.2Mpa.
Relief valves usually have DN15 ~ DN400 and other specifications, the valve before and after the working pressure is <1MPa and 0.1 ~ 0.5MPa, the pressure range error of ± 5% ~ 10%.
Troubleshooting The pressure behind the valve is unstable and changes as the pressure changes before the valve; cause;
1, the valve core is stuck in the foreign body;
2; Stem, push rod stuck;
3; The method of plugging the inlet pipe
1; re-installed to remove foreign matter 2, re-adjust;
3, after the valve is unblocked, the pressure drop does not come down, always changes above the demand value; cause;
1; set the spring stiffness is too large 2, the valve diameter is too large 3, the pressure before the valve is too high, the pressure reduction ratio is too large Exclusion method:
1, replace the spring 2, replace the smaller diameter 3, the valve before the pressure: the valve after the pressure exceeds 10:1 should be 2 step pressure valve after the pressure rise does not go up, always under the demand value changes; cause;
1; set the spring stiffness is too small 2, the valve diameter is too small 3, decompression ratio is too small Exclusion method:
1, replace the spring 2, replace the larger diameter 3, the valve before the pressure: the valve after the pressure is less than 1.25, should increase the pressure before the valve before the valve can not rise, always below the demand value action; cause;
1; set the spring stiffness is too small 2, the valve core is stuck in the foreign body;
3; Stem, push rod stuck;
4; spool, valve seat damage, leakage is too large 5, the valve diameter is too large to eliminate the method;
1; replacement of the spring 2, re-installation 3, re-adjustment 4. re-grinding or replacement 5, the pressure drop before replacing the smaller-diameter valve can not go, always above the demand value of the cause of the action;
1, set the spring stiffness is too large 2, the valve diameter is too small 3, spool, stem, push rod, etc. stuck exclusion method:
1, replace the spring 2, replace the larger diameter 3, eliminate the cause of stuck, re-adjust the valve pressure or valve pressure fluctuations occur too often 1, the valve diameter is too large 2 actuator capacity is too small Exclusion method:
1, choose the appropriate valve diameter 2, add dampers in the inlet pipe
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