Multifunctional pump control valve to the standard technical description for nominal pressure the PN1.0MPa-PN4.0MPa, nominal diameter for DN50mm-DN1200mm the multifunctional pump control valve.
The standard technical requirements are described below:
Pressure - temperature degree level.
Multifunctional pump control valve pressure - temperature rating of the casing, trim and control tube system material pressure - temperature rating OK. Multifunctional pump control valve at a certain temperature, the maximum allowable working pressure to take the housing, trim and control tube material in the temperature of the maximum allowable working pressure values of small value.
Iron shell of pressure - temperature rating shall comply with the provisions of GB/T17241.7.
Steel casing pressure - temperature rating shall comply with the provisions of GB/T9124.
For of GB/T17241.7 of GB/T9124 not specified pressure - temperature rating of the material, according to the provisions of the relevant standards or design.
The valve body is
Body flange
Flanges shall be cast into the valve body as a whole. The the iron flange type and size should comply with the provisions of the GB/T17241.6 the technical condition shall comply with the provisions of GB/T17241.7; steel flange type and size should meet GB/T9113.1 provisions, technical conditions shall comply with the provisions of GB/T9124.
A minimum wall thickness on the valve body.
The iron castings minimum wall thickness of the valve body should be in accordance with of GB/T13932-1992 Table 3, the minimum wall thickness of cast steel valve body shall comply with the provisions of JB/T8937-1999 Table 1
3. Valve cover film piece Block
Valve cover and diaphragm seat, the diaphragm seat with the valve connection type Flanged.
The diaphragm seat valve connecting bolts shall not be less than the number 4.
Bonnet with a minimum wall thickness of the diaphragm seat according to the requirements of 2.3.
The flange of the valve cover and diaphragm seat should be rounded. Type of flange sealing surface can be flat, raised face or lenticular.
Stem, slow closing valve plate, the main valve plate
Slow closing valve plate should be connected with the stem fastened reliable.
Slow closing valve plate and the main valve plate seal type should be used to the type of metal seal.
Board with the stem of the main valve must be the sliding flexible, reliable.
The main valve plate and seat the sealing of the main valve plate metal seals and non-metallic sealing two types can be used.
5. Diaphragm
The diaphragm performance should comply with the provisions of Table 2 (see next page).
The quality of the appearance of the diaphragm should be consistent with the provisions HG/T3090.
When used in drinking water, the safety of the diaphragm material shall conform to the provisions of GB/T17219.
Control tube system
The various components of the control tube system should be able to withstand the maximum working pressure of the valve, and various parts shall not leak.
7 Material
The main component material selection should by JB/T5300 the regulations.
Copper alloy castings shall conform to the provisions of GB/T12225; gray iron castings shall comply with the provisions of GB/T12226, its tensile strength shall be not less than 200 MPa; ductile iron castings shall comply with the provisions of GB/T12227; carbon steel castings shall conform to GB / T12229 provisions; austenitic steel castings shall comply with the provisions of GB/T12230.
Steel multifunctional pump shall comply with the provisions of JB/T7927 control valve castings appearance quality, multifunctional pump control valve iron casting appearance the quality reference JB/T7927 provisions.
8. Shell strength
Multifunctional pump control valve housing strength shall comply with the provisions of GB/T13927.
9. Sealing performance
Multifunctional pump control valve sealing performance should be consistent with the provisions of GB/T13927.
10 Cleanliness
The cleanliness multifunctional pump control valve shall comply with the provisions of JB/T7748.
11 Painting
When used in drinking water, multifunctional pump control valve cavity coating material security shall meet the requirements of the GB/T17219. The outer surface of the coating is not provided for special requirements stated in the contract.
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