This standard specifies the product classification, technical requirements, test methods, inspection rules, marking and packaging of marine flange cast iron single-row suction stop check valve boxes (hereinafter referred to as suction stop check valve boxes) with flange connection dimensions in accordance with GB 569 and GB 2501. This standard is applicable to marine piping systems with seawater and fresh water as the medium. GB/T 1855-1993 Marine flange cast iron single-row suction stop check valve boxes GB/T1855-1993 Standard download decompression password: www.bzxz.net

UDC629.12.D1:621.646.2
National Standard of the People's Republic of China
GB/T 18541856--93
Marine flanged cast iron single arrangement box valve
State Administration of Technical Supervision
W.National Standard of the People's Republic of China
Marine flanged cast iron single arrangements stop cherk hox vilveSubject Content and Scope of Application
GB/T 185593
Generation R 18580
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking and packaging of ship open flange cast iron single-row suction stop check valve box (hereinafter referred to as simple suction stop check valve box) with factory flange connection size according to GB56S, GB2S (1. This standard is applicable to the piping system of ships with fresh water as the medium. 2 Reference standards
GH 569Ship flange connection size and confidentiality
Gii6oGeneral technical conditions for ship pipeline reading partsGH250Ship method connection size and sealing surface (four-digit)GI3032Ship pipeline parts mark
ZB/TU52C01Ship casting wall thickness
3Product classification
3.1Suction stop check valveThe new type is stipulated as follows:R type-
Method connection! According to B's two-way suction stop valve box method = connection size according to GB2501's two-way suction stop concave box: method seat connection size ten core GB5 69-type suction stop check box: flange connection dimensions are in accordance with GB2501. 3.2 Basic parameters of the suction stop check box are in accordance with Table 1. 3.3 Structure of the suction stop check box. Length. Nominal pressure PM
3.3.1 Structure of the suction stop check valve and the position of the support are in accordance with Figure 1 and Figure 2. 3.3.2 R-type and S-type suction stop check boxes are in accordance with Table 2. 3.3.3 R5-type and SS-type suction stop check boxes are in accordance with Table 3. State Technical Supervision Bureau 1993·05 24 Approved public diameter DN./DN
10/53--150/20n
2±6/239~-2317300
1994 01-01 implementation
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GH/T185593
Figure 1 Suction check check valve box
Figure 2 Support seat
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GH/T 1855--93
The nominal pressure is 1.0MPa. The nominal diameter is DN, 50mm.DN, 65mn. According to the flange connection dimensions of GB569, the sealing surface of the ship's old flange cast single-row suction check valve box: suction stop check valve box R10050/65GB/T: 855--93 The nominal pressure is 0.6MPa, the nominal diameter is \N.20:mmDN:250I, according to the flange connection dimensions of GB2501 and the cover (called image) of the marine flange chain iron single-row triple stop check valve box: suction stop check box SS62C0/250GB/T1855·934 Technical requirements
4.1 The technical requirements for suction stop check valves are in accordance with GB600. 4.2 The main parts and materials of suction stop check valves are in accordance with Table 1. Table 4
Scientific name
Reading body. Taoyi
Gray cast iron
Xigong copper
Cast back copper
IIT 20m
Standard number
2QSn5-3-3
QAI9 2
ZQA19-2
4.3 The flange connection and sealing surface of the suction stop check valve box shall comply with GB56 and GB2501. 4.4 The casting wall thickness of the suction stop check valve box shall comply with ZB/TL:520014.5 The test rules and methods of the suction stop and check valve shall comply with GB600. 5 Inspection rules
5.1 Factory inspection
5.1.1 The suction stop check valve box shall be inspected item by item and can only be used after passing the inspection. 5.1.2 Factory inspection items are as shown in Table 5.
5.2 Type inspection
5.2.3 Type inspection should be carried out in the following cases: i. Trial and finalization appraisal of new products or old products for transfer to production; b. After formal production, if there are major changes in the process that may affect product performance; or when the national quality supervision agency requires type inspection. e.
5.2.2 Type inspection items Test requirements See Table 5: CH883
CH 4429
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6 Marking and packaging
GB/T 1855-93
Test items
Mechanical property determination and chemical or analytical analysis of castings Appearance inspection
Strength hydraulic test
Sealing pressure test
.6.1 The marking of the suction stop check valve box shall comply with GB 3032.6.2 The packaging of the suction stop check valve box shall comply with GB 5GG. Additional remarks:
This standard was proposed by China State Shipbuilding Corporation No. 2. This standard is under the jurisdiction of China State Shipbuilding Corporation No. 603. Inspection requirements
Conform to GB 9439, CB 683
Conform to GB6C0
This standard was drafted by Yu Qingshi, and the 603 Institute of China National Shipbuilding Corporation participated in the drafting of this standard. The main drafters of this standard are Liu Kaixiang, Sun Yinglin, Wu Shaozeng, and Mao Peisu. This standard is difficult to provide unified construction drawings.
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