This standard specifies the type, size and technical requirements of polytetrafluoroethylene (PTFE) gaskets for steel pipe flanges (European system). This standard applies to polytetrafluoroethylene (PTFE) gaskets for raised face steel pipe flanges with a nominal pressure PN of 0.6 MPa (6 bar) ^ - 4.0 MPa (4 0 bar) and a working temperature of 150V as specified in HG 20592. HG 20607-1997 Polytetrafluoroethylene (PTFE) gaskets for steel pipe flanges (European system) HG20607-1997 Standard download decompression password: www.bzxz.net

Polytetrafluoroethylene coated gaskets for steel pipe flanges (European system)
HG 20607-97
Subject content and scope of application
This standard specifies the type, size and technical requirements of polytetrafluoroethylene coated short gaskets for steel pipe flanges (European system). This standard is applicable to polytetrafluoroethylene coated gaskets for raised face steel pipe flanges with nominal pressure PN of 0.6MPa (6har) 4.0MPa (a0bar) and working temperature of 150°C as specified in HG20592. Note: With 1 month of use experience, it can be used up to 200 ℃, 185 ℃. GB3985 GB7136 GR/T 13404 HG20592 "Asbestos Rubber Gasket" Reference Standards Type Moulded Polytetrafluoroethylene Resin "Polytetrafluoroethylene Coated Gasket for Pipe Flange" "Steel Pipe Flange Type and Parameters (European System)" 3 Gasket Type and Size 3.1 The type of gasket is divided into machined T-wing type, machined rectangle and folded type according to the T method, which are represented by PMF type, PMS type and PFT type respectively, as shown in Figure 3. 3.0.2 Gasket size The size of PMF type gasket is specified in Table 3.0.21. 1
2PMS gasket dimensions are specified in Table 3.0.22. 3PFT gasket dimensions are specified in Table 3.0.2-3 4
The gasket dimensions listed in Table 3.0.2-1-3 are applicable to steel pipe flanges of the two steel pipe outer diameter series A and B listed in HC2052.
5 The inner diameter D of the coating in Table 3.0.2-1~3 is suitable for general situations, but it can also be modified according to needs, and the modified inner diameter size should be noted when ordering. 187
a. Machined wing type (PMF)
d:
b. Machined square type (PMS)
c. Folded type (PFT)
Gasket type
Coating layer
Coating device
Table 3.2-
PMF type gasket size
Nominal force PN, MPa (har)
Sheet outer diameter D
: Minimum inner diameter 13, the manufacturer can determine the gasket type and the total material properties. 3.0.2 2
Golden Cover
FMS Gasket Dimensionswww.bzxz.net
Nominal Pressure PN, MPa (ht)
Light Cover
Note: The outer diameter of the rubber layer is determined by the manufacturer according to the type of the film and the performance of the embedded layer material. 4.0
Coating Layer
Coating Layer
Table 3.0.23 PFT Gasket Dimensions
Nominal Pressure PN, MPa (ht)
Gasket Outer Diameter ID)
Note: The inner diameter D2 of the embedded layer is determined by the manufacturer according to the type of the film and the performance of the embedded layer material. 190
4 Technical Requirements
4.0.1 The raw materials of the polytetrafluoroethylene coating gel shall comply with the grade requirements of GB713iPTFESM031. 4.0.2 Embedding layer - generally asbestos rubber sheet, its technical performance index shall comply with the provisions of X350 or XB4.50 in (133985). If the purchaser has special requirements, other materials may be used. Please indicate it when ordering. 4.0.3 The limit deviation of the inner diameter D. and outer diameter D, and D, of the gasket shall comply with the provisions of Table 4.0.3. The limit deviation of the coating thickness is 0.05mm and the limit deviation of the total thickness of the gasket is ±0.10mm. The gasket shall be smooth, without warping and deformation, with uniform thickness, and no defects such as holes and slag inclusions are allowed. 4: 0. 4
The compression rate, stress relaxation rate and sealing leakage rate of the gasket shall comply with the provisions of GB/T13404. 4. 10. 5
Table 4.3 Limit deviation of gasket inner and outer diameters, D4 Nominal diameter
Limit deviation
.. 0. 5
Limit deviation
Limit deviation
5 Marking and packaging
5.0.1 Gaskets shall be packed according to type, specification and material, and a product quality inspection certificate shall be attached upon delivery. Gaskets shall be marked with labels, 0.2 specified. 5.0.2 Marking Example
For example, a commercial steel pipe machined wing-shaped four-piece ethylene-encapsulated gasket with a nominal diameter of 100 mm and a nominal pressure of 2.5 MPa (25 bar), the marking is:
HG20607
PTFE-encapsulated gasket
100--2. 6
Folding type polytetrafluoroethylene wrapped gasket for steel pipe flange with nominal diameter 500mm and nominal pressure 1.0Mpa (10bar) ·The embedded layer material is rubber effect ·The mark is: H 206:7
Packing pad (rubber sheet)
Additional instructions: The unit proposing this standard, the main unit and the main drafter: Equipment Design Technology Center 590-1.0
Chemical Industry Department Chemical Engineering Technology Center Chief Editor: Equipment Design Technology Center of the Ministry of Chemical Industry
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