This standard is applicable to multi-function water pump control valves with a nominal pressure of PN1.0MPa-PN4.0MPa and a nominal diameter of DN50mm-DN1200mm. The standard technical requirements are now described as follows:
1, pressure - temperature level
The pressure of the multi-function water pump control valve - the temperature level is determined by the pressure of the housing, the internals and the material of the control pipe system - the temperature class. The maximum allowable working pressure of the multi-function water pump control valve at a certain temperature is a small value of the maximum allowable working pressure value of the housing, the inner part and the control tube system material at the temperature.
1.1, the pressure of the iron shell - temperature grade should meet the requirements of GB/T17241.7.
1.2, the pressure of the steel shell - temperature level should meet the requirements of GB/T9124.
1.3. For GB/T17241.7 and GB/T9124, the pressure-temperature class materials are not specified, and may be in accordance with the relevant standards or design regulations.
2, valve body
2.1, valve body flange
The flange should be cast integrally with the valve body. The type and size of the iron flange shall comply with the provisions of GB/T17241.6, the technical conditions shall comply with the provisions of GB/T17241.7; the type and size of the steel flange shall comply with the provisions of GB/T9113.1, technical conditions Should comply with the provisions of GB/T9124.
2.2. The length of the valve body structure is shown in Table 1.
2.3, the minimum wall thickness of the valve body The minimum wall thickness of the cast iron body should meet the requirements of Table 3 of GB/T13932-1992. The minimum wall thickness of the cast steel body should meet the requirements of Table 1 of JB/T8937-1999. .
3, bonnet diaphragm seat
3.1, the valve cover and the diaphragm seat, the diaphragm seat and the valve body connection type should be flanged.
3.2. The number of connecting bolts between the diaphragm seat and the valve body shall not be less than 4.
3.3. The minimum wall thickness of the bonnet and diaphragm seat is as specified in 2.3.
3.4. The flange of the bonnet and diaphragm seat shall be round. The type of flange sealing surface can be flat, convex or concave