A brief introduction of multi-functional water pump control valve technical requirements (b)

4. Stem, relief valve closed, the main valve plate



Closed relief valve should be connected with the stem fastening and reliable.



Relief valve closing the main valve plate and seal plate type should be the type of metal seal.



The main valve stem must be sliding plate and a flexible and reliable.



The main valve plate and the main valve seat sealing plate can be sealed metal seals and two non-metallic type.



5. Diaphragm



The appearance of patch quality should be consistent with the provisions of HG/T3090.



When used in drinking water, the membrane material should be consistent with the security provisions of GB/T17219.



6. Control system



Control system components of the valve should be able to withstand the maximum working pressure, the site may not be leaked.



7. Material



The main components of the selected material should be in accordance with the provisions of JB/T5300.



Copper alloy castings shall be in accordance with the provisions of GB/T12225; gray iron castings shall be in accordance with the provisions of GB/T12226, the tensile strength should be not less than 200MPa; ductile iron castings shall be in accordance with the provisions of GB/T12227; carbon steel castings should be in line with GB / T12229 requirements; austenitic steel castings shall be in accordance with the provisions of GB/T12230.



Multifunctional Pump Control Valve Steel Casting appearance quality should be consistent with the provisions of JB/T7927, multi-pump control valves, iron casting the light of the appearance of the quality of the provisions of JB/T7927.



8. Shell strength



Multifunctional Pump Control Valve shell strength should be consistent with the provisions of GB/T13927.



9. Sealing performance



Multifunctional Pump Control Valve should be in accordance with the sealing performance GB/T13927 requirements.



10. Cleanliness



Multifunctional Pump Control Valve should be in line with the cleanliness JB/T7748 requirements.



11. Painting



When used in drinking water, the multi-functional water pump control valve cavity coating materials should be consistent with the security provisions of GB/T17219. The outer surface of coating is not provided, the special requirements of the contract specified in the order.

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