The standard applies to the nominal pressure of PN1.0MPa-PN4.0MPa, the nominal diameter of DN50mm-DN1200mm multifunctional water pump control valve. The standard technical requirements are introduced as follows.

    1 pressure - temperature degree level

    Multifunctional water pump control valve pressure - temperature level by the shell, internal parts and control pipe system material pressure - temperature level to determine.

wafer type cast iron butterfly valve

    Multifunctional water pump control valve in a temperature of the maximum allowable working pressure to take the shell, internal parts and control tube system materials in the temperature of the maximum allowable working pressure value in the small value.

    1.1 multifunctional water pump control valve iron shell pressure - temperature level should be consistent with the provisions of GB/T17241.7.

    1.2 Multifunctional water pump control valve steel shell pressure - temperature level should be in line with the provisions of GB/T9124.

    1.3 multifunctional water pump control valve for GB/T17241.7, GB/T9124 does not specify the pressure - temperature level of the material, according to the relevant standards or design provisions.

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    2 multifunctional water pump control valve valve body

    2.1 Multifunctional water pump control valve valve body flange

    Flange should be cast with the valve body as a whole. Iron flange type and size should be consistent with the provisions of GB/T17241.6, technical conditions should be consistent with the provisions of GB/T17241.7; steel flange type and size should be consistent with the provisions of GB/T9113.1, technical conditions should be consistent with the provisions of GB/T9124.

    2.2 Multifunctional water pump control valve valve body structure length

    2.3 The minimum wall thickness of the multifunctional water pump control valve body

    The minimum wall thickness of the cast iron valve body should comply with the provisions of GB/T13932-1992 Table 3, the minimum wall thickness of the cast steel valve body should comply with the provisions of JB/T8937-1999 Table 1.

    3 multifunctional water pump control valve cover diaphragm seat

    3.1 Multifunctional water pump control valve cover and diaphragm seat, diaphragm seat and valve body connection type should be flange type.

    3.2 Multifunctional water pump control valve diaphragm seat and the number of bolts connecting the valve body shall not be less than 4.

    3.3 Multifunctional water pump control valve cover and the minimum wall thickness of the diaphragm seat according to the requirements of 2.3.

    3.4 Multifunctional water pump control valve cover and the flange of the diaphragm seat should be round. The type of flange sealing surface can be used flat, protruding type or concave-convex type.

    4 valve stem, slow-closing valve plate, the main valve plate

    4.1 Slow-closing valve plate and valve stem should be connected tightly and reliably.

    4.2 The sealing type of the slow-closing valve plate and the main valve plate should adopt the metal sealing type.

    4.3 The main valve plate and the valve stem must be flexible and reliable.

    4.4 The main valve plate and the main valve plate seat seal can be used metal seal and non-metal seal two types.

    5 Multifunctional water pump control valve diaphragm

    5.1 Diaphragm performance should be in line with the provisions of Table 2 (see next page).

    5.2 Diaphragm appearance quality should be in line with the provisions of HG / T3090.

    5.3 When applied to drinking water, the safety of the diaphragm material should comply with the provisions of GB/T17219.

    6 Multifunctional pump control valve control tube system

    The components of the control tube system should be able to withstand the highest working pressure of the valve, and no leakage shall occur in any part.

    7 Multifunctional water pump control valve materials

    7.1 The selection of the main components materials should be in accordance with the provisions of JB/T5300.

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

    7.3 Steel multifunctional water pump control valve castings appearance quality should be in line with the provisions of JB/T7927, iron multifunctional water pump control valve castings appearance quality with reference to the provisions of JB/T7927.

    8 Shell strength

    Multi-functional water pump control valve shell strength should be in line with the provisions of GB/T13927.

    9 sealing performance

    Multifunctional water pump control valve sealing performance should be in line with the provisions of GB/T13927.

    10 Cleanliness

    The cleanliness of the multifunctional water pump control valve should be in accordance with the provisions of JB/T7748.

    11 Painting

    When applied to drinking water, the multifunctional water pump control valve cavity coating material safety