This standard specifies the product classification, technical requirements, test methods, inspection rules, marking and packaging of marine flange cast steel steam pressure reducing valves with flange connection dimensions in accordance with GB569 and GB2501. This standard is applicable to marine steam pipelines with a temperature not exceeding 300°C. GB/T 1852-1993 Marine flange cast steel steam pressure reducing valve GB/T1852-1993 Standard download decompression password: www.bzxz.net

UC: 629. 12. 01 : 62'. 626- 2U52
National Standard of the People's Republic of China
GB/T 1852—93
Marine flanged cast steel steam pressure reducing valves
Marine steel flanged steani pressure reducing valves1993-05-24 Issued
1994-01-01 Implementation
State Technical Supervision Bureau Issued
National Standard of the People's Republic of China
Marine flanged cast steel steam pressure reducing valves
Mxrinx: steel fungrd sleai pμressure redicing valves1 Title Content and Scope of Application
CB/T1852-93
G61852-S0www.bzxz.net
This standard specifies the flange connection according to GB569, GB2501 for the production of steam pressure reduction valves (hereinafter referred to as pressure reduction valves), technical requirements, test methods, inspection rules, standardization and packaging. This standard is applicable to steam pipes with a temperature not exceeding 300°C. 2 Reference standards
(3559 Marine flange connection size and specification cover GHS General technical regulations for mechanical pipeline valves
B25U Marine flange connection size according to tight surface (four-way avoidance) [H3)32 Marking of marine pipeline accessories
7B/TL52001 Wall thickness of cast valve parts
3 Product classification
3.1 The products are divided into flange technical dimensions according to 69 pressure reducing net and flange connection dimensions according to GB2501 type pressure reducing valve. 3.2 Basic parameters of reduction and correction are shown in Table 1 Nominal diameter Steam pressure Import pressure: Import and export size 2 3.3 Final valve station size 0.4--2.5 0.2~0.5 0.05 G-- 1- 3
3.3.1 Flange connection dimensions are in accordance with the connection dimensions of the pressure reducing valve of GB5 in Figure 1 and Table 2. National Technical Supervision Product Approval 1993-05-24 uu
1994-0101 Implementation
15D:200
Overall dimensions
GB/T1852-93
1 Half-lubricity body: 2 Lower lift 3 Main reduction fee, 4-Main reading plate 5 Live production 6 Deputy room too pregnant,? Tongue ring; 8-front cover 19-brush seat-diaphragm: 11 training section 112-upper plate 113--pool spring 14--Table 2
PN&5MI Import
Dallant connection size
PNMPa Export
Position flange connection size according to GB2501 S-type pressure reducing valve tree size according to 1 and Table 3D
Outer size industry
3. Number mark system
GK/T 1852-93
Flange close connection size
PN2.5MP Import H
PN1. 6MPa outlet pressure less than 2.5MPa and pressure less than 0.6--1.2MPa, the outlet diameter is 40m, the nominal diameter is 2+GB5, the flange is connected to the steam pressure reducing pottery with the same size of the sealing surface, the pressure reducing net is 25/6~200/50/1852-53
, the outlet pressure is less than or equal to 2.5M1a, the outlet pressure is less than C5MPa, the inlet diameter is 100, the nominal diameter 125mm, flange connection size according to 2501 and the size of the whole cover (four-position) of the condensing steam pressure reducing valve: Sheng pressure 93/2--61/125GB/T1852--034 Technical requirements
4.1 Materials required for installation 4.
Name of parts
Main room parking space, control room upper plate, lower plate diaphragm
Main flash bomb, medical paste
Adjustment book bomb
ZG230-930
Qr. S. 5 h I
0Si2Mn
4.2 The chain parts of the pressure reducing valve shall not have cracks, cracks, potential holes, flying judgments and other defects that affect the coating. The standard is GB3219
GBT1852-93
4.3 The pressure reduction method can be used according to the surface connection 55425314.4 The wall thickness of the pressure reducing body shall be 232!1.
4.5 The pressure reducing body shall not be measured
4.6 The connection and sealing of the pressure reducing valve shall be smooth and adjustable between the maximum value and the minimum value of the full pressure outlet. 46 The error of the pressure change of the two selected ports shall be 1C.25MPa. 4.9 The pressure drop value of the pressure reducing valve shall not be greater than .! I. The value of the note should not be lower than the value in Table 5, Table 5
li Inlet public diameter pN.mm
Steam (flow.kg/lh
?19 yuan
.4 J3J
1 50.15 :15
20 450
2-1 28
Details: 5. According to the flow of the subject, if the steam is produced by superheated steam, the actual ring capacity of the steam is calculated according to the actual volume of the fine root pile. 4.10 The pressure-induced life test is 10,000 times. 4.11 Other technical records are in accordance with GB6C:0
5 Test method
5.1 Strength water pressure test
Both the main body and the auxiliary body are subjected to a strength water pressure test. The test pressure is 3.5MPa, and the pressure is maintained for 5min. 5-2 Sealing water pressure test
5.2. Sealing test of the main body and the auxiliary body, the main body and the lower body, the auxiliary and the auxiliary, the auxiliary seal, and the auxiliary limit plate. Remove the upper and lower springs and diaphragms. If the import is 3.1MPa, the joints and belts do not need to be checked. 5.7.2E The sealing test of the difference between the pressure and the brush is completed. Use the pressure plate to block any outlet. The point of the inlet is to supply liquid music: .5MPa and gradually tighten the spring. The pressure reduction is led to the filter pressure and the filter pressure is supplied. The upper and lower seals are not made. 5.3 Pressure adjustment test (with air as the medium) The inlet pressure is maintained at the lowest commercial level. Adjust the adjustment spring! Understand the changes in the pressure of the product and the country's heart. It must meet the requirements of 4 and 7.
5. Le pressure characteristic test [with air as the medium]
R,T 1852 -93
According to the test device shown in Figure 2, the pressure must be kept at a high level. Adjust the pressure so that the outlet pressure is the maximum value, and the maximum pressure is adjusted to 2P above the maximum value to the maximum range of the pressure state.
: In order to note the nominal diameter,
5.5 Single characteristic test (with steam as the medium) 2
When the inlet of the test device shown in Figure 3 is maintained at a high pressure, adjust the outlet pressure to the highest value, and measure the total quality and flow rate of the outlet pressure (refer to Table 5). 3
55 Glass life test (with air as the medium) According to the test device shown in Figure 4, when the inlet pressure is the highest, adjust the outlet pressure to the maximum value: High value, the pressure reducing valve can be changed at a frequency of 15 times, and the time between one opening and one closing is 3. The switching function and pipeline before and after the pressure reducing valve should make the outlet pressure of the pressure reducing valve rise from the lowest value to the lowest value, and then drop to the required value in 1 second.
6 Inspection rules
6.1 Type inspection
6.1-1 Type inspection should be carried out when the following conditions occur: new products or modified products with performance changes;. After the factory modification or formal production, if there are major changes that may affect the product performance: the quality inspection standard requirements are not met. 6.1.2 Type inspection items are in accordance with Table 6.
6-2 Factory inspection
GH/T1852-93
Loose items
: Chemical test
External installation
Cold pressure test
Radiative water pressure test
Pressure control
Positive force test
Flow test
Please keep the test according to 1.1 Record the muscle
Technology GB600
Technology 4. 5 series or! The visual performance of the product is determined according to the provisions of 4.T and 5.3. The visual performance of 4.6 and 5.5 is determined according to 4.9 and 5.5. 1.16. 5-6 is used to regulate the output of each network! The inspection of 1.2.3 and 5 of the technical table 5 is carried out in advance, and the product can be shipped after passing the inspection.22 The ordering party shall conduct random inspection of the production, and the quality inspection and re-inspection of each batch of products shall be carried out according to the ordering agreement. 7 Marking and packaging
7.1 The standard of pressure relief valve shall be in accordance with GB3032.
7.2 After the qualified pressure relief valve is dried, the outer surface shall be heat-resistant. There shall be no layering and flow at the inlet of the inner cavity. The duration is 1 minute, so that the valve cavity is sealed. 7.3 After the pressure relief valve is lubricated, the two flanges of the valve shall be sealed with dust caps, so that garbage and dust shall not enter the inner cavity. ?.4 Each pressure relief valve shall have the following items: 1 valve spring, 1 spring, 1 diaphragm, 1 ring, and the number of spare parts and products required shall be proposed by the ordering party when placing an order. Additional remarks:
This standard is issued by China General Industry Corporation.
The standard is under the jurisdiction of SU3 Institute of China State Shipbuilding Corporation. The main drafters of this standard are: Jihua.
This standard was formulated in 1980. This revision adds "flange reverse connection dimensions meet the specification series of G2501, adds energy test items and type inspection.
The standard also has unified standard drawings.
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