Standard technology for self-operated flow control valves
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 casing - the temperature class should meet the requirements of GB/T17241.7.
1.2 The pressure of the steel shell - the temperature level should meet the requirements of GB/T9124.
1.3 For GB/T17241.7, GB/T9124 does not specify the pressure-temperature class of materials, according to the relevant standards or design regulations.
2, valve body
2.1 Valve body flange flange should be integrally molded 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 valve body structure length.
2.3 The minimum wall thickness of the valve body The minimum wall thickness of the cast iron body shall comply with the provisions of Table 3 of GB/T13932-1992. The minimum wall thickness of the steel body shall comply with the requirements of Table 1 of JB/T8937-1999.
3 bonnet diaphragm seat
3.1 The connection type of the bonnet and the diaphragm seat, the diaphragm seat and the valve body shall 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.
4 valve stem, slow closing valve plate, main valve plate
4.1 The slow-closing valve plate and the valve stem should be connected tightly and reliably.
4.2 The sealing type of the slow-closing valve plate and the main valve plate shall be in the form of metal seal.
4.3 The main valve plate and valve stem must be flexible and reliable.
4.4 The main valve plate and the main valve plate seat can be sealed in two types: metal seal and non-metal seal.
5 diaphragm
5.1 Diaphragm performance shall be in accordance with Table 2 (see next page).
5.2 The appearance quality of the diaphragm shall comply with the provisions of HG/T3090. From: http://
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