This standard specifies the terminology, type, basic parameters, technical requirements, test methods, inspection rules, marking and packaging of safety valves and compensating valves for diaphragm metering pumps. This standard is applicable to the conveying temperature of -30~100℃, viscosity of 0.3~8002/s, corrosive or non-corrosive liquids without solid particles; single-unit rated flow rate of 0.48~2500L/h, rated discharge pressure of 0.2~16.0MPa for reciprocating diaphragm metering pumps. JB/T 5411-1991 Safety valve and compensating valve for diaphragm metering pumps JB/T5411-1991 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T5411---91
Safety valve and compensation valve for diaphragm metering pumps
Published on July 22, 1991
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Implementation on July 1, 1992
Mechanical Industry Standard of the People's Republic of China
Safety valve and compensation valve for diaphragm metering pumps
1 Subject content and scope of application
JB/T5411—91
This standard specifies the terminology, type, basic parameters, technical requirements, test methods, inspection rules, marking and packaging of safety valves and compensation valves for diaphragm metering pumps.
This standard is applicable to the safety valves and compensating valves (hereinafter referred to as "safety valves" and "compensating valves") for reciprocating diaphragm metering pumps with a conveying temperature of -30 to 100°C, a viscosity of 0.3 to 800 mm2/s, and no solid particles, and a single-unit rated flow rate of 0.48 to 2500 L/h and a rated discharge pressure of 0.216.0 MPa. 2 Reference standards
GB1239
GB1801
GB9236
GB12241
GB12242
ZBJ71018
3 Terms
3.1 Safety valve
Ordinary cylindrical helical spring
Tolerance and fit dimensions to 500mm:
Tolerance zone and fit of hole and shaft
Technical conditions for metering pumps
General requirements for safety valves
Test methods for performance of safety valves
Hydraulic and leakage tests for parts and components of reciprocating pumps For terms for safety valves, see the provisions of GB12241.
3.2 Compensation valve
During the operation of the diaphragm metering pump, a wide door that can be opened and through which the medium is replenished into the hydraulic chamber. 3.2.7 Automatic compensation valve
When the diaphragm metering pump is in operation, when the vacuum in the hydraulic chamber reaches the set value, the valve that can automatically open to replenish the medium. 3.2.2 Forced opening compensation valvewwW.bzxz.Net
When the diaphragm metering pump is in operation, every time the plunger reaches the dead point of the suction stroke, it must be forced to open once instantly to communicate the passage between the hydraulic chamber and the hydraulic medium storage tank. At this time, if the medium in the hydraulic chamber is insufficient, the valve can be automatically replenished. 3.2.3 Limit compensation valve
When the diaphragm metering pump is in operation, the diaphragm flexural deformation displacement is used to control the opening of the valve to communicate the passage between the hydraulic chamber and the medium storage tank. At this time, if the medium in the hydraulic chamber is insufficient, the valve can be automatically replenished. 4 Type
4.1 Safety valve type
According to the structure of the safety valve plate, it can be divided into spherical and disc types, and should comply with the provisions of Table 1. Approved by the Ministry of Machinery and Electronics Industry on July 22, 1991 and implemented on July 1, 1992
Valve seat hole diameter D
4.2 Compensation valve type
The structural type of the compensation valve shall be in accordance with the provisions of Table 2. Structural type
Automatic compensation type
Forced opening compensation type
Limited compensation type
4.3 Model indication method
JB/T5411-91
Structural type
Spherical or disc-shaped
Transmission adjustment structural type
N-shaped shaft
Installation type
Threaded installation
Installation type
Vertical threaded installation of centralized oil tank
Independent inverted threaded installation
The models of safety valves and compensation valves are composed of uppercase Chinese pinyin letters and Arabic numerals, and the indication method is as follows. 4.3.1 The model representation method of the safety valve is as follows: AF
Model example:
Rated discharge pressure of diaphragm metering pump: expressed in numbers, MPa Valve seat hole diameter: expressed in numbers, mm
Type: spherical is represented by Q, and disc type is not represented. Basic code of safety valve
Spherical safety valve for diaphragm metering pump with a valve seat hole diameter of 0.4mm and a rated discharge pressure of 16MPa: AFQ0.4/16
Compensation reading Model designation is as follows:
Model example:
Automatic compensating valve is indicated by Z
Forced opening compensating valve is indicated by Q
Limited compensating valve is indicated by X
Basic code of compensating valve
Automatic compensating valve for diaphragm metering pump: BFZ
Basic parameters of safety valve
The valve seat hole diameter D of the safety valve corresponds to the rated discharge pressure of the diaphragm metering pump, and the range of rated flow Q: is selected according to the basic parameters in Table 3.
6 Technical requirements
JB/T5411-91
13~125
63~630
125~1250
320~2500
6.1 Safety valves and compensating valves shall be manufactured in accordance with the provisions of this standard and in accordance with the drawings and technical documents approved by the prescribed procedures. 15.0
10002500
6.2 The safety valve shall be equipped with a locking device to prevent the mechanism for adjusting the spring compression from loosening or changing the adjusted pressure at will. 6.3 The valve seat of the safety valve shall be tightly fitted or other fastening measures shall be taken, and there shall be no looseness after assembly. 6.4 The requirements for the spring for the safety valve are as follows. 6.4.1 The design calculation formula of the spring and the allowable stress of the material shall be in accordance with the provisions of GB1239. 6.4.2 There shall be a support plane of no less than 3/4 circle at both ends of the spring, and the end of the support circle shall be tight with the working circle. The accuracy grade of the verticality tolerance of the two ends of the spring circle and the spring axis shall not be lower than the grade 2 requirement specified in GB1239. 6.4.3 After the spring is manufactured, it shall be stabilized to produce plastic deformation and beneficial residual stress in the spring wire. 6.5 The performance of the safety valve and the compensation valve is as follows. 6.5.1 The opening pressure of the safety valve shall be in accordance with the provisions of Table 4. Rated discharge pressure of diaphragm metering pump
Opening pressure of safety valve
Per +0. 3
JB/T5411-91
6.5.2 The return seat pressure of the safety valve shall be greater than or equal to 0.8 times the opening pressure. 5.0~8.0
10.0~16.0
6.6 The fit between the inner circle of the valve body and the outer circle of the piston of the forced opening compensation valve shall be manufactured in accordance with the H7/f7 requirements specified in GB1801. 6.7 The safety valve and compensation valve shall be sensitive, stable and reliable. 6.8 The sealing test of the sealing surface of the safety valve and compensation valve and the hydraulic test of the compensation valve shall be in accordance with the provisions of ZBJ71018. 7 Test method
7.1 Safety valve test method
7.1.1 Safety valve test device
The safety valve is tested for opening pressure and back-seating pressure on the test device shown in the figure below, and can also be directly tested for opening pressure on a qualified diaphragm metering pump.
Pressure gauge
7.1.2 Pressure measurement of safety valve
Test container
Safety valve
Hydraulic source
Throttle valve
7.1.2.1 The accuracy grade of the pressure gauge should not be lower than 0.5, and the measured pressure should be within the range of 1/3 to 2/3 of the instrument range. 7.1.2.2 The location of the pressure measuring point should ensure that the static pressure of the hydraulic oil can be measured. 7.1.3 Measurement of opening pressure and back-seating pressure7.1.3.1 The safety valve is tested for opening pressure and back-seating pressure on the test device shown in the figure. The safety valve is installed on the test device shown in the figure. The hydraulic source injects liquid into the pressure vessel to gradually increase the pressure. The pressure gauge reading at the moment the safety valve opens is the opening pressure value. After the throttle valve is closed, the pressure in the pressure vessel tends to stabilize. The reading value of the pressure gauge when it is stable is the return pressure value. 7.1.3.2 Safety valve measures the opening pressure on the diaphragm metering pump. Install the safety valve on the diaphragm metering pump in normal operation, and adjust the throttle valve on the pump outlet pipe to increase the discharge pressure of the pump. When the discharge pressure exceeds 90% of the rated opening pressure value of the safety valve, the pressure increase rate should not exceed 0.01MPa/s, observe the outlet flow of the diaphragm metering pump, and record the opening pressure value of the pressure gauge on the pipeline. The safety valve opening flow is significantly reduced or there is no flow, which proves that the safety valve opens sensitively. 7.2 Compensation valve test method
7.2.1 The compensation valve should be installed on a qualified diaphragm metering pump for testing. 7.2.2 Test method of compensation valve
After the storage tank is filled with oil, start the diaphragm metering pump when the plunger relative stroke is adjusted to 0, and then gradually increase the plunger relative stroke to 100%. At the same time, observe the change of the medium level and measure the stability accuracy of the diaphragm metering pump. The medium level should decrease and tend to be stable as the relative stroke increases. Measure 5 times continuously at 100%. The stability accuracy should meet the relevant provisions of GB9236, proving that the compensation valve is sensitive and reliable.
Inspection rules
8.1 Inspection rules for safety valves
JB/T5411---91
8.1.1 Each safety valve shall be inspected and qualified by the inspection department of the manufacturer before it can leave the factory. 8.1.2
All kinds of inspections for safety valves shall be in accordance with the provisions of Table 5. Table 5
Test items
Opening pressure
Reseat pressure
Type test
Type of inspection
Spot inspection
Note: v means that the test should be carried out; O means that the test should be carried out as required; X means that the test is not carried out. 8.1.3 Type test
The first prototype of a new product shall be subjected to type test. 8.1.4 Spot inspection
Products produced in batches shall be subject to spot inspection regularly. 8.1.5 Each safety valve shall be subjected to factory inspection. 8.2 Inspection rules for compensating valves
Each compensating valve shall be inspected and qualified by the inspection department of the manufacturer in accordance with the requirements of Article 7.2.2 before it can leave the factory. 9 Marking and packaging
9.1 The outer surface of each safety valve or compensating valve shall be marked with its respective model in a conspicuous position. 9.2 Qualified safety valves or compensating valves shall be coated with anti-rust oil on the outer surface, then packed in a plastic bag and sealed. Additional notes:
This standard was proposed and coordinated by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Pan Zhengguang.
Factory inspection
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