This standard specifies the terminology, type, basic parameters, technical requirements, test methods, inspection rules, marking and packaging of diaphragms and limit plates used in hydraulically driven diaphragm metering pumps. This standard is suitable for transporting corrosive or non-corrosive liquids with a temperature of -30~100℃, a viscosity of 0.3~8002/s, and no solid particles; the rated flow rate of a single unit is 0.48~2500L/h, and the rated discharge pressure is 0.2 Diaphragms and limiting plates for ~16.0MPa reciprocating diaphragm metering pumps. JB/T 5412-1991 Diaphragm and limit plate for diaphragm metering pump JB/T5412-1991 Standard download and decompression password: www.bzxz.net

J | | tt | | JB | Published on 22nd
Published by the Ministry of Mechanical and Electronics Industry of the People's Republic of China
Implemented on 1992-07-01
Mechanical Industry Standards of the People's Republic of China
Diaphragms and Restrictions for Diaphragm Pumps Plate
Subject content and scope of application
JB/T5412-91
This standard specifies the terminology, type, basic parameters, Technical requirements, test methods and acceptance rules, packaging.
This standard is suitable for conveying corrosive or non-corrosive liquids with a temperature of -30~100℃, a viscosity of 0.3~800mm/s, and no surrounding particles. The rated flow rate of a single unit is 0.48~6300L/h. Reciprocating hydraulically driven diaphragm metering pumps with rated discharge pressures of 0.2~16.0MPa require diaphragms and limiting plates (hereinafter referred to as diaphragms and limiting plates). 2 Terms
2.1 Diaphragm
A circular membrane-shaped elastic element that isolates the working medium and the conveying medium. 2.2 Limiting plate
is a piece that limits the limit displacement of the diaphragm.
2.3 Membrane cavity
The space contained by the limit displacement of the diaphragm.
Types and basic parameters
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3.1 Diaphragm type
According to the diaphragm structure, it can be divided into flat type, flat plate sandwich ring type, corrugated plate type, and multi-layer composite type and sandwich type, etc. 3.2 Limiting plate type
According to the surface forming line of the limiting plate, it can be divided into multi-index type, circular type, phosphorus type, cosine type and other types of limiting plates. 3.3 Basic parameters
3.3.1 The outer diameter D of the diaphragm is selected according to the value specified in Table 1. Table 1 | |tt | ,260,280,(296),300,320,340,360,380,400,420 ,450480,500 Note: The size in the reference number is limited.
3.3.2 The diaphragm sealing width B is selected based on its effective true diameter 4m and the value specified in Table 2. Table 2
d.
B
4 Technical requirements
>32~70
>10
Ministry of Mechanical and Electronic Industry 1991- 07-22Approval>70~100
≥15
>100~170
>20
>170~250
>25||tt ||mm
>250
>30
Implemented on 1992-07-01
I
JB/T5412—91
Diaphragm and limit plates shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.1 Diaphragm | limit value), high durability limit plastic, metal, rubber or similar materials.
4.1.2 The thickness of the diaphragm should be uniform, the surface should be flat and smooth, and there should be no scratches, nicks and other defects that affect the service life. 4.1.3 Under the maximum deflection specified in the design, the number of flexural deformations of the diaphragm should not be less than 3×10° times. 4.2 Limiting plate
4.2.1 The membrane cavity profile and sealing surface of the limiting plate should have a smooth transition, and the profile should be smooth. The flow holes (grids) on the profile surface should be rounded and should be free of burrs, scratches and other defects.
4.2.2 The total area of ??the flow hole (slot) of the single-sided restriction plate should be greater than the plunger (piston) load area. 4.3 The effective space volume of the membrane cavity
membrane cavity should not be less than 1.1 times the plunger (piston) stroke volume. 5 Test methods and acceptance ruleswww.bzxz.net
5.1 Diaphragm fatigue life test method
5.1.1 Direct pump test method
Adjust the pump to operate under rated working conditions, and accumulate the The number of deformations of the diaphragm. 5.1.2 Testing machine method
The diaphragm is loaded into the testing machine, and an accelerated flexural deformation frequency test is conducted under direct drive without liquid medium. When it reaches the maximum degree specified in the pump design, the accumulated deflection during normal operation is The number of flexural deformations of the diaphragm, 5.2 Acceptance rules
5.2.1 When the diaphragm and limiting plate leave the factory, each piece shall be accepted one by one according to the requirements in Chapter 4 (except Article 4.1.3). 5.2.2 For each batch of diaphragms with different types, materials or thicknesses, no less than two samples should be taken and subjected to the disease fatigue life test according to the method specified in 5.1, and should meet the requirements of 4.1.3.
6 Packaging
Each finished diaphragm should be isolated and packaged in a plastic film bag. Additional notes:
This standard was proposed and administered by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronics Industry. This standard was drafted by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronics Industry. This standard starts with the personnel and case safety.
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