Technical requirements for multi-function water pump control valve This standard applies to multi-function water pump control valves with a nominal pressure of PN1.0MPa-PN4.0MPa and a nominal diameter of DN50mm-DN1200mm. Dental Equipment,Dental Supplies,High Speed Handpiece Gd-H501,Dental X-Ray Unit NOUVASANT PHARMhealth LTD. , http://www.nouvasant.com
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 multi-purpose water pump control valve has a large allowable working pressure at a certain temperature to take a small value of the allowable working pressure value of the shell, the inner part and the control tube system material at this temperature.
The pressure of the iron casing - the temperature class should meet the requirements of GB/T17241.7.
The pressure of the steel casing - the temperature class should meet the requirements of GB/T9124.
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
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.
Small wall thickness of the valve body
The small wall thickness of the cast iron valve body shall comply with the provisions of Table 3 of GB/T13932-1992. The small wall thickness of the steel body of the cast steel part shall comply with the provisions of Table 1 of JB/T8937-1999.
3 bonnet diaphragm seat
The connection type of the bonnet and the diaphragm seat, the diaphragm seat and the valve body should be flanged.
The number of connecting bolts between the diaphragm seat and the valve body shall not be less than four.
The small wall thickness of the bonnet and diaphragm seat is in accordance with the requirements of 2.3.
The flange of the bonnet and diaphragm seat should be round. The type of flange sealing surface can be flat, convex or concave.
4 valve stem, slow-closing valve plate, main valve plate
The slow-closing valve plate and the valve stem should be connected tightly and reliably.
The sealing type of the slow-closing valve plate and the main valve plate shall be in the form of a metal seal.
The main valve plate and the valve stem must be flexible and reliable.
The main valve plate and the main valve plate seat can be sealed in both metal and non-metallic seals.
5 diaphragm
Diaphragm performance should be in accordance with Table 2 (see next page).
The appearance quality of the diaphragm should be in accordance with HG/T3090.
When applied to drinking water, the safety of the diaphragm material should meet the requirements of GB/T17219.
6 control tube system
The components of the control tube system shall be able to withstand the high working pressure of the valve and shall not leak at all parts.
7 materials
The selection of the main parts and materials should be in accordance with the provisions of JB/T5300.
Copper alloy castings shall comply with the provisions of GB/T12225; gray cast iron castings shall comply with the provisions of GB/T12226, and the tensile strength shall not be less than 200 MPa; ductile iron castings shall comply with the provisions of GB/T12227; carbon steel castings shall comply with GB/ The provisions of T12229; austenitic steel castings shall comply with the provisions of GB/T12230.
The appearance quality of the steel multi-function water pump control valve castings should meet the requirements of JB/T7927. The appearance quality of the iron multi-function water pump control valve castings refers to the provisions of JB/T7927.
8 shell strength
The shell strength of the multi-function water pump control valve shall comply with the provisions of GB/T13927.
9 sealing performance
The sealing performance of the multi-function water pump control valve shall comply with the provisions of GB/T13927.
10 cleanliness
The cleanliness of the multi-function water pump control valve shall comply with the provisions of JB/T7748.
11 painting
When applied to drinking water, the safety of the coating material of the multi-function water pump control valve shall comply with the provisions of GB/T17219. The outer surface coating is not specified, and special requirements are stated in the order contract.