This standard specifies the types and basic parameters of self-priming centrifugal pumps. This standard applies to pumps that transport clean water, liquid food, gasoline, kerosene, diesel and corrosive liquids. The maximum temperature of the transported liquid is 80°C. JB/T 7256-1994 Types and basic parameters of self-priming centrifugal pumps JB/T7256-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7256-94bzxz.net
Types and basic parameters of self-priming centrifugal pumps
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
Types and basic parameters of self-priming centrifugal pumps
Subject content and scope of application
This standard specifies the types and basic parameters of white-suction centrifugal pumps (hereinafter referred to as pumps). This standard is applicable to pumps for conveying clean water, liquid food, gasoline, kerosene, diesel and corrosive liquids. The maximum temperature of the conveyed liquid is 80℃. The specified working pressure is 0.6MPa when H≤50m and 1MPa when H>50m. 2 Type
is horizontal, single-stage single-suction cantilever type,
3 Model
Model indication method:
Head, m
Flow, m/b
JB/T7256-94
Conveying medium: S-liquid food: Y-light oil: F-corrosive liquid; clean water is not indicated
Type, N-internal mixing; external mixing is not indicated Self-priming centrifugal pump
Mark Example:
Flow rate 12.5m*/h, head 32m external mixing self-priming centrifugal clean water pump Z12.5-32
Flow rate 50m/h, head 40m, internal mixing self-priming centrifugal pump for conveying light oil products: ZNY50-40
4 Basic parameters
4.1 The performance parameters of the pump at the specified point shall comply with the provisions of Table 1. The values ​​in the table are the performance parameters for clean water at room temperature. The performance working range of the system is shown in Figure 1.
4.2 When stainless steel materials are used, the efficiency of the pump is reduced by 3 percentage points according to the values ​​in Table 1, and the self-priming time t shall meet the following conditions: 4.3
The self-priming height shall comply with the provisions of Table 2;
The inner diameter of the suction pipe of the pump shall be the same as the diameter of the suction port: The length of the horizontal section of the suction pipe shall not exceed 0.5m: The effective length of the suction pipe shall be greater than the specified self-priming height, but shall not exceed 0.5m. Approved by the Ministry of Machinery Industry on July 18, 1994
Implemented on July 1, 1995
JB/T 725694
/1 00t k 0062*
/1 0062
Z1. 6-12. 5
Z2. 2-12. 5
ZA,5-12. 5
Z12. 5-12.5
Suction port
Discharge port
JB/T 7256-94
Drinking Residual Amount
Self-priming Time
Z18-10
Z18-16
Z18-20
Z18-25
Z18-32
Z18-40
Z18-50
Z25-10
Z25-12. 5 | |tt | |tt||Z36-32
Z 36-40 | |tt | |tt||Discharge outlet
JB/T 725694
Continued Table 1
Cavitation balance
Self-priming time
Z50-80
Z71-16
Z71-20
Z71-25
Z71-32
Z71-40
Z71-50
Z71-63
Z71-80
Z100- 20 | | tt | | Z100-25 | t||Z140-63
Z140-80
Z200 -50
Z200-63
Z140-32
2140-40
Z140-50
Z140-63
Z140-80
Z200-50
Z200-63
Z200-80
Suction port
Discharge port
Note: When equipped with a single-phase motor, the Speed ​​is 2820r/minJB/T7256--94
Continued Table 1
Erosion margin
Self-priming time
Self-priming height
Rotation direction
JB/T7256-94
>100~140
>140~200
From the driving end, the specified case is clockwise rotation, and it can also be made counterclockwise when necessary. Additional remarks:
This standard was proposed and coordinated by Shenyang Water Pump Research Institute. This standard was drafted by Shenyang Water Pump Research Institute. The main drafter of this standard is Zhou Shaopo,
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