JB/T 7174.1-1993 Technical Specifications for Fuel Delivery Valve Assemblies of Diesel Engine Injection Pumps JB/T7174.1-1993 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7174.1-93
Diesel Engine Fuel Injection Pump Delivery Valve Pair
Technical Conditions
Published on November 21, 1993
Ministry of Machinery Industry of the People's Republic of China
Implementation on March 1, 1994
Mechanical Industry Standard of the People's Republic of China
Diesel Engine Fuel Injection Pump Delivery Valve Pair
Technical Conditions
1 Subject Content and Scope of Application
JB/T 7174.193
This standard specifies the technical requirements, inspection rules, marking, packaging, transportation and storage of medium and small power diesel engine fuel injection pump delivery valve pairs (hereinafter referred to as delivery valve pairs).
This standard applies to medium and small power diesel engine fuel injection pump delivery valve pairs. 2 Reference standards
GB1299
GB2828
GB2829
GB3077www.bzxz.net
ZBJ94005
ZBJ94019
3 Technical requirements
Technical conditions for alloy tool steel
Counting sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)Counting sampling procedure and sampling table for periodic inspection (applicable to inspection of production process stability)Technical conditions for alloy structural steel
Technical conditions for chromium bearing steel
Metallographic inspection of diesel engine fuel injection nozzle parts, fuel injection pump plunger parts, fuel injection pump oil delivery valve partsMagnetic particle inspection method for fuel injection nozzle parts, plunger parts, oil delivery valve parts3.1 The oil delivery valve parts shall be manufactured according to the product drawings and technical documents approved by the prescribed procedures and comply with the requirements of this standard. 3.2 The oil outlet valve seat and the oil outlet valve should be made of GCr15 ball bearing steel specified in YB9 or CrWMn alloy tool steel specified in GB1299. The oil outlet valve can also be made of 18Cr2Ni4WA low carbon alloy steel specified in GB3077. With technical basis and user consent, the oil outlet valve seat and the oil outlet valve are allowed to be made of other grades of steel. 3.3 The oil outlet valve and the oil outlet valve seat should be heat treated, and their metallographic structure should comply with the provisions of ZBJ94005. If the material used is outside ZBJ94005, it shall be in accordance with the provisions of the relevant technical documents. 3.3.1 The surface of the oil outlet valve seat and the oil outlet valve made of GCr15 or CrWMn is not allowed to be burned. The hardness of the oil outlet valve seat is 6064HRC, and the hardness of the oil outlet valve is 60~63HRC
3.3.2 All oil outlet valves made of low-carbon alloy structural steel should be carburized or carbonitrided, and their surface hardness is 720~820HVt. The effective hardened layer depth should comply with the provisions of relevant technical documents. 3.4 The shape and position tolerances of the oil outlet valve seat and the oil outlet valve are as specified in the following table. Part name
Oil outlet seat
Parallelism of the inner working surface of the oil outlet with pressure relief flange and the inner working surface of the oil outlet with pressure relief flange and the inner working surface of the oil outlet without pressure relief flange and the inner working surface of the oil outlet without pressure relief flange. Approved by the Ministry of Machinery Industry on November 21, 1993
Implemented on March 1, 1994
Part name
Oil outlet valve seat
Oil outlet valve
JB/T 7174.193
Oblique runout of the end face to the axis of the inner column working surfaceDiameter of the support end face to the axis of the inner column working surfaceParallelism of the sealing surface
End face circular runout of the upper end to the axis of the inner column working surfaceDiameter of the support cone face to the inner column working surfaceDiameter of the sealing end face
Diameter of the cylindrical working surface and the pressure relief flanged20
d > 20
Diameter of the cylindrical working surface and the pressure relief flange line (large end on the sealing cone)Diameter of the working surface of the oil outlet valve without a flangeParallelism of the cylindrical working surface line of the oil outlet valve without a pressure relief flangeRoundness of the sealing surface
Oblique runout of the end face to the axis of the column working surfaceDecompression lift
The surface roughness of the oil outlet valve parts shall comply with the following requirements. 3.5
The cylindrical working surface roughness parameter R of the oil outlet valve and the oil outlet valve seat with pressure relief flange is 0.20um. The relative precision parameter R of the cylindrical working surface of the oil outlet valve and the oil outlet valve seat without pressure relief flange is 0.40um. The surface roughness parameter R of the sealing cone of the oil outlet valve and the oil outlet valve seat is 0.40μm. 3.5.4 The surface roughness parameter R of the sealing end face of the oil outlet valve seat is 0.20μm. 3.6 The oil outlet valve seat and the oil outlet valve shall be subjected to magnetic particle inspection in accordance with the provisions of ZBJ94019. 3.7 The oil outlet valve shall have good sliding properties in the oil outlet valve seat. The sealing cone surface of the oil outlet valve coupling shall have good sealing properties. 3.8
The sealing value of the diameter of the oil outlet valve coupling shall comply with the requirements of the technical documents approved according to the prescribed procedures. The reliability index of the oil outlet valve coupling is calculated according to the following formula. MTTF-
In the formula, MTTF--average working time before failure, h: +(nT
-number of samples that fail within the test deadline; t--failure time of the auxiliary oil outlet valve pair, h; n--number of reliability test samples;
T. Test truncation time, h
When r=0, let MTTF=2nT.
3.11 The reliability index MTTF value of the oil outlet valve pair shall be agreed upon by the supplier and the demander.
.0.0012
3.12 Provided that the user complies with the instruction manual, the warranty period for the oil outlet valve pair is 1 year from the date of leaving the factory, and the cumulative use time shall not exceed 1200 hours. If the manufacturer's fault is damaged or cannot be used normally, the manufacturer shall replace it. 4 Inspection rules
4.1. The oil outlet valve pair must be inspected by the manufacturer's quality inspection department in accordance with this standard and can only be shipped after passing the inspection. 2
JB/T 7174. 193
4.2 The factory inspection items are generally Articles 3.7, 3.8 and 3.9. The sampling rules and the judgment of whether the product is qualified or not shall be in accordance with the relevant provisions of GB2828. The sampling rules for type inspection and the judgment of whether the product is qualified or not shall be in accordance with the relevant provisions of GB2829. 5 Marking, packaging, transportation and storage
5.1 Each pair of oil delivery valve parts shall be marked with the factory logo or trademark of the manufacturer. During the service life, the mark shall remain clear and recognizable. 5.2 Each pair of oil delivery valve parts shall be treated with corrosion protection and packaged. 5.3 The oil delivery valve parts that have been treated with corrosion protection and packaged shall be packed in a moisture-proof packaging box together with the product certificate signed by the inspector and relevant factory documents, and the outside of the packaging box shall be marked with: a.
Product name:
Product license number;
Product model:
Mark Approval number,
Quantity:
Packing date (year, month);
Manufacturer's logo or trademark;
Manufacturer's name:
Transport protection mark,
The weight of each packing box shall not exceed 30kg.
5.4 The packaging shall fully ensure that the oil-discharging parts will not be damaged or damp during transportation. 5.5 The oil-discharging parts shall be stored in a dry warehouse and shall not be stored together with acids, alkalis and other chemicals that can cause corrosion. Under normal storage conditions, the manufacturer shall ensure that the products will not rust within 1 year from the date of leaving the factory. Additional remarks:
This standard was proposed and managed by Wuxi Oil Pump and Nozzle Research Institute of the Ministry of Machinery Industry. This standard was drafted by Wuxi Oil Pump and Nozzle Research Institute, Shanghai Internal Combustion Engine Research Institute and other units. The main drafter of this standard is Cao Huirong.
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