Technology of self operated flow control valve for

Many (2) the installation foundation is not firm or the anchor screws are loose; Technology of self operated flow control valve of functional water pump

this standard is applicable to the multi-function water pump control valve with nominal pressure of pn1.0mpa-pn4.0mpa and nominal diameter of dn50mm-dn1200mm. Now the standard technical requirements are introduced as follows: 1. Pressure temperature grade

the pressure temperature grade of the multi-function water pump control valve is determined by the pressure temperature grade of the shell, internals and control pipe system materials. The maximum allowable working pressure of the multi-function water pump control valve at a certain temperature is the smaller of the maximum allowable working pressure of the shell, internals and control pipe system materials at that temperature

1.1 the pressure temperature grade of iron shell shall comply with the provisions of gb/t17241.7

1.2 the pressure temperature grade of steel shell shall comply with the provisions of gb/t9124

1.3 for materials without pressure temperature grade specified in gb/t17241.7 and gb/t9124, relevant standards or design regulations can be followed

2. Valve body

2.1 the valve body flange should be cast with the valve body as a whole. The type and size of iron flanges shall comply with the provisions of gb/t17241.6, and the technical conditions shall comply with the provisions of gb/t17241.7; The type and size of steel flanges shall comply with the provisions of gb/t9113.1, and the technical conditions shall comply with the provisions of gb/t9124

2.2 structural length of valve body. Before the cement is dried,

2.3 minimum wall thickness of valve body the minimum wall thickness of cast iron valve body shall comply with the provisions of Table 3 in gb/t, and the minimum wall thickness of steel casting valve body shall comply with the provisions of Table 1 in jb/t8 serial number

3 valve cover diaphragm seat

3.1 the connection type between valve cover and diaphragm seat and between diaphragm seat and valve body shall be flange type

3.2 the number of connecting bolts between diaphragm seat and valve body shall not be less than 4

3.3 the minimum wall thickness of valve cover and diaphragm seat 1. Microcomputer closed-loop control shall meet the requirements of 2.3

3.4 the flange of valve cover and diaphragm seat shall be circular. The flange sealing surface can be flat, convex or concave convex

4 valve rod, slow closing valve plate, main valve plate

4.1 the slow closing valve plate and valve rod should be connected firmly and reliably

4.2 the sealing type of slow closing valve plate and main valve plate shall be metal sealing type

4.3 the main valve plate and valve rod must slide flexibly and reliably

4.4 the seal between the main valve plate and the main valve plate seat can adopt two types of metal seal and non-metal seal

5 diaphragm

5.1 diaphragm performance shall comply with the provisions of Table 2 (see the next page)

5.2 the appearance quality of the diaphragm shall comply with the provisions of hg/t3090

5.3 when used in drinking water, the safety of diaphragm material should comply with the provisions of gb/t17219

6 control pipe system

all components of the control pipe system shall be able to withstand the maximum working pressure of the valve, and no leakage shall occur at all parts

7 materials

7.1 the materials of main parts should be selected according to jb/t5300

7.2 copper alloy castings shall comply with the provisions of gb/t12225; Gray cast iron castings shall comply with the provisions of gb/t12226, and its tensile strength shall not be less than 200MPa; Ductile iron castings shall comply with the provisions of gb/t12227; Carbon steel castings shall comply with the provisions of gb/t12229; Austenitic steel castings shall comply with the provisions of gb/t12230

7.3 the appearance quality of steel multi-function water pump control valve castings shall comply with the provisions of jb/t7927, and the appearance quality of iron multi-function water pump control valve castings shall refer 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 domestic drinking water, the safety of the coating material in the inner cavity of the multi-function water pump control valve should comply with the provisions of gb/t17219. The coating of outer surface is not specified, and special requirements are indicated in the order contract