HG/T 2438-1993 Quality classification of modified phenolic glass fiber reinforced plastic ball valves HG/T2438-1993 standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T2438-93
Modified phenolic glass fiber
Quality classification of reinforced plastic ball valves
Published on June 14, 1993
Implemented on January 1, 1994
Published by the Ministry of Chemical Industry of the People's Republic of China Chemical Industry Standard of the People's Republic of China
Quality classification of modified phenolic glass fiber reinforced plastic ball valves Subject content and scope of application
HG/T2438-93
This standard specifies the quality classification of modified phenolic glass fiber reinforced plastic Detailed rules, test methods and inspection regulations for ball valve quality classification. This standard is applicable to modified phenolic glass fiber reinforced plastic low-pressure floating ball valves (hereinafter referred to as ball valves) with medium-alkali glass fiber as reinforcement material, modified phenolic resin as matrix and compression molding. The use range is in accordance with the provisions of ZBQ23002 standard; the applicable specifications are eight types from Dg15 to 100mm. Other specifications of ball valves greater than Dg100mm can refer to 2 Reference standards
ZBQ23002 "Modified phenolic glass fiber reinforced plastic ball valve" 3 Product quality classification
Ball valve product quality is divided into superior, first-class and qualified products. 4 Product quality classification details
4.1 The raw materials should comply with the relevant provisions of Article 2.2.1 and 2.2.2 of ZBQ23002 standard. 4.2 The structural dimensions and flange connection dimensions of various specifications of ball valves with nominal diameter Dg15--100mm should comply with the relevant provisions of Chapter 1 and Article 2.3.7 of ZBQ23002 standard
4.3 The mechanical properties classification indicators of molding material molded specimens used to manufacture ball valves are shown in Table 1. Table 1
Mechanical properties
Tensile strength
Compressive strength
Bending strength
Impact toughness
Superior products
The classification indicators of visible defects on the surface of ball valve molded parts are shown in Table 2.4.4
Defect name
Small pieces falling off or peeling off on the edge surface, threads and bolt holes of the body and other molded parts.
There are slight cracks on the surface or under the surface of the molded parts. Approved by the Ministry of Chemical Industry of the People's Republic of China on 1993-06-14. Superior products
Peeling length
1 piece/each part
No such defects
First-class products
First-class products
Peeling length
1 piece/each part
Crack length
3 pieces/each part
Qualified products
Qualified products
Peeling length
1 piece/each part||tt| |Crack length
3 pieces/each part
1994-01-01 implementation
Defect name
Prying skin pattern
HG/T2438-93
Continued cutting 2
Superior product
The surface of the molded part is arched, with obvious or unclear boundaries
The surface is uneven, slightly similar to the surface of orange peel,
Non-metallic impurities mixed in the molded part,
Metal impurities mixed in the molded part.
The edges and corners of the molded parts are not completely filled
No such defect
No such defect
No such defect
No such defect
No such defect
For the flatness tolerance of the flange sealing surfaces at both ends of the ball valve, see Table 3, 4.5
Superior products
4.6 For the water pressure bursting performance of ball valves, see Table 4. Nominal diameter
Above 80mm
15-80mm| |tt||Superior products
4.7 The classification index of effective sealing switching times of ball valves is shown in Table 5. Unit
Superior products
First-class products
First-class products
First-class products
Bubble diameter
1 piece/each part
Diameter <13mm
Length <0.8mm
1 piece/each part
No such defect
No such defect
Qualified products
First-class products
Qualified products
4.8 Other technical conditions not covered by this standard shall comply with the requirements of ZBQ23002 standard. 5 Test methods
5.1 Test methods for mechanical properties of molding materials shall comply with the provisions of Chapter 3 of ZBQ23002 standard. Qualified products
Pool diameter
1 piece/each part
Diameter <29mm
Length <1.5mm
1 piece/each part
No such defects| |tt||No such defect
Qualified product
5.2 The visible defects of the appearance of each molded part of the Yuemen are inspected with a vernier caliper and visual inspection. 5.3 The flatness tolerance measurement method of the flange sealing surface is as follows: Place the valve body vertically on a metal platform, set a magnetic base dial indicator on the platform, use the dial indicator to measure the rod head along the flange sealing surface for one circle, and measure the absolute difference between the highest point and the lowest point as the flatness tolerance; each end of the flange is tested at least twice at different positions, and the maximum value of the four test values ​​is taken as the test result. 5.4 The test method of water pressure bursting performance is carried out in accordance with Article 3.3.5 of ZBQ23003 standard. 5.5 The test method of effective sealing switching times is as follows: After the valve is filled with water, both ends are closed, and then the ball is turned 90°, and the switch is 5-10 times per minute. After reaching 800 times, a water pressure seal test of 1.5 times the working pressure is carried out, and no leakage is qualified. The test of first-class products should be carried out in two stages: the first stage is the same as the inspection method of qualified products. If qualified, conduct another 200 switch tests, and then conduct a second 1.5 times working pressure water pressure seal test. If there is no leakage, it is a first-class product. The inspection of superior products needs to be carried out in three stages: the first, second, and third stages are the same as the inspection of first-class products. If there is no leakage, conduct another 500 switch tests, and then conduct a third 1.5 times working pressure water pressure seal test. If there is no leakage, it is a superior product. 6 Inspection rules
6.1 Batch and sampling
HG/T2438-93
6.1.1 Mechanical properties inspection of molding materials, according to the production batch disc as a batch sample preparation inspection, 6.1.2 The visible defects of the appearance of molded parts and the flatness tolerance of the sealing surface are inspected one by one. 6.1.3 Water pressure bursting performance, sample 5 pieces per batch according to the variety, and the maximum batch disc shall not exceed 2,000 pieces. 6.1.4 Effective seal opening and closing times, 3 pieces are sampled per batch according to the variety, and the maximum batch shall not exceed 2000 pieces. 6.2 Judgment rules
6.2.1 Any repaired parts or products shall not be determined as first-class or superior products. 6.2.2 According to the mechanical properties of the samples, the test values ​​of the visible surface defects of the parts and the flatness tolerance of the sealing surface, the parts shall be pre-classified according to the provisions of Table 1, Table 2 and Table 3. 6.2.3 For ball valve products assembled with parts and components of the same grade after pre-classification, samples shall be drawn according to the sampling provisions of Chapter 6 to test their water pressure bursting performance and effective seal opening and closing times, and the grade of the batch of valves shall be determined according to the provisions of Table 4 and Table 5. If all the samples in the two tests meet or exceed the corresponding index requirements of the pre-classification, the pre-classification level shall be the final grade of the batch of products; otherwise, the grade corresponding to the sample with the lowest test result in the two tests shall be the final grade of the batch of products. Additional Notes:
This standard was proposed by China National Chemical Equipment Corporation and is under the jurisdiction of the National Technical Committee for Standardization of Non-metallic Chemical Equipment. This standard was drafted by the Chemical Machinery Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are: Zhang Junke and Chen Guangping. People's Republic of China
Chemical Industry Standard
Quality Classification Standard for Modified Phenolic Glass Fiber Reinforced Plastic Ball Valves HG/T2438-93
Editor China National Chemical Equipment Corporation
Postal Code 100011
Printed by Beijing Institute of Chemical Technology Printing Factory
Copyright reserved
880×12301/16
June 1994 EditionbZxz.net
No Reprinting
Printing Sheet 0.5
7.5 thousand words
First Printing in June 1994
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