JB/T 97-1999 This standard is a revision of J93 002-87 "Technical Conditions for Valve Seats for Internal Combustion Engines". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard specifies the technical requirements, inspection methods, inspection rules and marking, packaging, transportation and storage of valve seats for internal combustion engines. This standard is applicable to block-type cast valve seats for reciprocating internal combustion engines with a cylinder diameter of 200mm or less. This standard was first issued in 1987. JB/T 9769-1999 Technical Conditions for Valve Seats for Internal Combustion Engines JB/T9769-1999 Standard download decompression password: www.bzxz.net

ICS 27.020
Machinery Industry Standard of the People's Republic of China
JB/T 9769-1999
Internal combustion engines
-Valve seat insets-Specifications1999-09-17 Issued
State Bureau of Machinery Industry
2000-01-01 Implementation
JB/T97691999
Foreword
This standard is a revision of ZBJ93002--87 "Technical Specifications for Valve Seats for Internal Combustion Engines". Only editorial changes were made to the original standard during the revision, and the main technical content remained unchanged. This standard replaces ZBJ93002-87 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Internal Combustion Engines. The drafting unit of this standard is Shanghai Internal Combustion Engine Research Institute. The main drafter of this standard is Li Shaoqiu.
This standard was first issued in 1987.
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Valve Seats of Internal Combustion Engines
Internal combustion engines
-Valve seat insets---SpecificationsJB/T 9769-1999
Replaces ZBJ93002-87
This standard specifies the technical requirements, inspection methods, inspection rules and markings, packaging, transportation and storage of valve seats for internal combustion engines. This standard is applicable to the block-type casting valve seats (hereinafter referred to as valve seats) of reciprocating internal combustion engines with a cylinder diameter of less than or equal to 200mm
2 Referenced Standards
The following standards contain provisions. The provisions of this standard are constituted by reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 1184-1996
GB/T 2828—1987
JB/T8893-1999
3 Technical requirements
Shape and position tolerances without tolerance values
Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) Metallographic inspection of valve seats for internal combustion engines
3.1 Valve seats shall be manufactured in accordance with product drawings and technical documents approved by the prescribed procedures. 3.2 Valve seats are generally made of the materials listed in Table 1. Table 1
3.3 Valve seat metallographic inspection shall be carried out in accordance with the provisions of JB/T8893
3.4 ​​The hardness difference of each point on the same valve seat shall not exceed 5 HRC units. 3.5 The dimensional tolerance value of the valve seat shall not exceed that specified in Table 2. Approved by the State Machinery Industry Bureau on September 17, 1999, and implemented on January 1, 2000. Valve seat parts Dimension tolerance values ​​JB/T 9769-1999 Outer diameter 3.6 The surface roughness R value of the valve seat shall not be less than that specified in Table 3. Table 3 Valve seat parts Surface roughness R, value Outer cylindrical surface Inner true diameter Inner cylindrical surface 3.7 The shape and position tolerance of the valve seat shall be manufactured according to the following grades specified in GB/T1184: a) The verticality of the outer cylindrical surface to the upper end surface is Grade 7; Note: The upper end surface refers to the contact surface with the valve red cover. b) The parallelism of the lower end face to the upper end face is level 7: c) The coaxiality of the inner cylindrical face to the outer cylindrical face is level 9: d) The cylindricity of the outer circle is level 8.
Upper and lower end faces
3.8 Recommended values ​​for the assembly interference of the valve seat: 0.0015~0.003 of the outer diameter of the valve seat for matching with cast iron cylinder heads: 0.002~0.0035 of the outer diameter of the valve seat for matching with aluminum cylinder heads. 3.9 Surface quality of valve seats
3.9.1 The sealing cone surface of the valve seat shall not have casting defects such as cracks, looseness, pores and slag inclusions. 3.9.2 Cracks and slag inclusions are not allowed in other parts: However, casting defects such as pores, shrinkage cavities and sand holes within the following specifications are allowed:
a) The diameter does not exceed 0.2mm;
b) The number of defects on the same piece does not exceed 3; c) The hole run-off distance is greater than 10mm.
3.10 The life of the valve seat should not be less than the overhaul period of the internal combustion engine. Under normal use, if the user causes damage due to poor manufacturing quality during the warranty period, the manufacturer shall be responsible for replacement. 4 Inspection rules
4.1 Each product must be inspected and qualified by the manufacturer's technical inspection department before it can be shipped. 4.2 When the ordering unit samples the product quality plate, it shall be carried out in accordance with the provisions of GB/T2828, or agreed upon by the ordering unit and the manufacturer. 5 Marking, packaging, storage
5.1 Each valve seat must be cleaned, oil-sealed or otherwise treated with rust prevention before packaging, and wrapped with strong, water-proof neutral paper or film before being packed into a packaging box. Each box should contain valve seats of the same model. 5.2 The packaging box should indicate:
a) Manufacturer's name, logo and address;
b) Internal combustion engine model, part name and part number: 2
c) Quantity:bZxz.net
d) Date of publication.
JB/T9769-1999
5.3 The packaging box should be accompanied by a product quality certificate signed by the inspector, and the certificate should indicate: a) Manufacturer's name, logo and address;
b) Internal combustion engine model, part name and part number: c) Inspection date.
5.4 The packaged valve seat must be packed in a dry packaging box lined with waterproof paper, and ensure that the parts will not be damaged during normal transportation. The total mass shall not exceed 50kg.
5.5 The packaging box should be marked with:
a) Manufacturer's name, logo and address;
b) Internal combustion engine model and part name;
c) Total mass and quantity;
d) Volume (length × width × height), mm;
e) Receiving unit and address;
f) Packing date;
g) "Handle with care", "Moisture-proof" and other signs. S.6 The packaged valve seat should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that it will not rust within 12 months from the date of leaving the factory.
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