This standard specifies the terms and definitions of static seals and packing seals. This standard applies to static seals and packing seals. JB/T 6612-1993 Static seals, packing seals terminology JB/T6612-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T6612-93
Terms of static seal and packing seal
Published on May 7, 1993
Ministry of Machinery Industry of the People's Republic of China
Implementation on January 1, 1994
Subject content and scope of application
Basic terms
Seals
Material properties
Appendix A
Appendix B
Chinese Pinyin index (supplement)
English index (supplement)
Mechanical Industry Standard of the People's Republic of China
Terms of static seal and packing seal
Subject content and scope of application
This standard specifies the terminology and definitions of static seal and packing seal. This standard applies to static seal and packing seal. 2 Basic terms
2.1 Leakage
Transmission of material through the seal.
2.2 Leakage rate
The mass of the sealed medium that leaks through the seal per unit time. Index Leakage rate allowableleakagerate2.3
Artificially specified leakage rate allowable index.
2.4 Static seal
The seal between relatively static mating surfaces.
2.4.1 Fitted face of flange The sealed flange surface.
2.4.2 Contact seal Dircctcontact seal The seal that uses the sealing force to press the seal and the mating surface against each other or even embed them to reduce or eliminate the gap. 2.4.3 Sealing force (sealing load) Sealing force (sealing load) The contact force acting on the seal of the contact seal. 2.4.4 Sealing specific pressure Sealing specific pressure The sealing force acting on the unit area of ​​the seal. 2.4, 5 Linear seal specific pressure linesealingspecificpressure Sealing force acting on the unit length of the line contact seal. 2.4.6 Self-tightening effect self seal effect The phenomenon that the seal is self-tightened after being acted upon by the medium pressure. 2.4.7 Self-tightening seal pressurized seal The seal whose sealing force is increased by the medium pressure load. 2.5 Packing seal packing seal
The seal of the packing as a seal.
2.5.1 Contact pressure contactprcssure The force between the friction surfaces of the packing seal.
2.5.2 Tracingability tracingability
JB/T6612-93
The performance of the seal to timely close the sealing gap caused by the vibration. The condition for maintaining the tracking performance is that the restoring force is greater than the interference force. 2.5.3 Starting friction force The force that resists the relative movement between friction surfaces when the mechanism is started. Approved by the Ministry of Machinery Industry on May 7, 1993
Implementation on January 1, 1994
JB/T6612-93
5 Moving friction force
2.5.4 Moving friction force The force that resists the relative movement between friction surfaces when the mechanism is moving. 3 Seals
3.1 Gasket Gasket A thin-section seal placed between mating surfaces with a geometry that meets the requirements. 3.1.1 Non-metallic gasket Non-metallic gasket Gasket made of non-metallic materials.
3.1.1.1 Paper gasket Fiber sheet gasket Gasket made of cardboard.
3.1.1.2 Asbestos gasket Asbestos gasket Gasket made of compressed asbestos. 3.1.1.3 Rubber gasket rubbergasket
Gasket made of rubber sheet.
3.1.1.4 Plastic gasket plasticgasket Gasket made of plastic sheet.
3.1.1.5 Polytetrafluoroethylene gasket
PTFEgasket
Gasket made of polytetrafluoroethylene.
3.1.1.6 Flexible graphite gasket flaxiblegraphitegasket Gasket made of flexible graphite.
3.1.2 Metal gasket metallicgasket
Gasket made of metal material.
3.1.2.1 Flat metal gasket flatmetallicgasket Metal gasket with flat sealing surface.
3.1.2.2 Metal corrugated gasket corrugated metal gasket made of corrugated metal sheet (see Figure 1. A
Figure 1 Metal corrugated gasket
metallic serrated gasket
3.1.2.3 Metal serrated gasket
The metal flat gasket has multiple concentric triangular grooves on the upper and lower surfaces, and its cut surface is serrated (see Figure 2). O
Figure 2 Metal serrated gasket
3.2 Ring gasket
A thick section seal placed between the mating surfaces with a geometric shape that meets the requirements. octagonal ring
3.2.1 Octagonal ring
Oval ring
3.2.2 Oval ring
Oval ring
3.2.3 Double cone ring
JB/T6612-93
3.2.4 C-ring
Oval ring
Oval ring
3.2.5 Oval ring
O ...
"C\-shaped sealing ring (see Figure 6). 3.2.5 "B"-ring
"B\-shaped sealing ring (see Figure 7). Figure 5 Double cone ring
Figure 6 "C"-shaped ring
Figure 7 "B\-ring
3.2.6 Metal hollow O\-ringmetallichollowO-ring"O\-shaped hollow metal ring, welded from metal tube (see Figure 8)Figure 8 Metal hollow "O\-ring
3.2.7 Lens ring
lens type ring
JB/T6612-93
The upper and lower sealing surfaces are both spherical sealing rings, and their shape is similar to a convex lens (see Figure 9). Figure 9 Lens ring
3.3 Composite gasket compositegasket
Gaskets made of two or more materials as required. 3.3.1 Asbestos-rubber gasket asbestos-rubber gasket Gasket made of asbestos rubber sheet.
3.3.2 Metal gasket metal Jacketed gasket is a gasket made of non-metallic materials coated with metal sheets. 3.3.3 PTFE jacketed gasket is a gasket with a PTFE coating on the surface. 3.3.4 Flexible graphite coated gasket is a gasket with flexible graphite coated on the outside of the metal jacketed gasket. 3.3.5 Spiral wound gasket is a gasket made by alternating spiral winding of a shaped metal strip and a non-metallic coaxial line and coplanar. 3.3.6 Spiral wound and metal jacketed gasket is a combination gasket with a ribbed metal jacketed gasket as the base and a wound gasket wound on the outer circumference, which is used in multi-layer heat exchangers. 3.3.7 Skeleton type flexible graphite gasket is a gasket made of flexible graphite and a skeleton compounded according to a specific process. 3.3.8 Asbestos-rubber gasket with metal ring jacket Asbestos-rubber gasket with metal ring jacket Asbestos-rubber gasket with metal ring wrapped around the inner periphery. 3.3.9 Metal reinforced gasket Metal reinforced gasket Gasket with metal reinforcement.
3.3.10 Braided gasket Braided gasket Gasket woven with sealing material.
3.4 ​​Sealant Sealant The matrix is ​​high molecular synthetic resin and synthetic rubber or natural high molecular organic matter, and it is a viscous liquid that can flow at room temperature. 3.5 Packing packing
On equipment or machines, it is a component that is installed between the movable rod and the hole through which it passes, and acts as a seal for the medium. 3.5.1 Jam-type packing is soft in texture, and is compressed axially in the stuffing box to produce radial elastic-plastic deformation to block the gap. 3.5.1.1 Oil-impregnated asbestos packing is a packing made by knitting or twisting asbestos wire and impregnating it with lubricating oil and graphite powder. 3.5.1.2 Oil-impregnated cotton and flax packing is a packing made by knitting or twisting cotton and flax wire and impregnating it with lubricating oil (butter). 3.5.1.3 Rubber-asbestos packing is a packing made by rolling or knitting asbestos cloth or asbestos wire with rubber as a binder. 3.5.1.4 Fluorine-impregnated asbestos packing PTFE impregnate das bestos packing Packing made of asbestos impregnated with an emulsion containing polytetrafluoroethylene and grease. 3.5.1.5 Inhibiting asbestos packing Inhibiting asbestos packing Packing made of asbestos treated with corrosion inhibitors or sacrificial metals (such as NaNo2 and Zn powder). 3.5.1.6 Phenolic fiber braided packing Phenolic fiber braided packing4
JB/T 6612-93
Phenolic fiber braided packing Packing braided with phenolic fiber impregnated with lubricant. 3.5.1.7 Polyamide fiber braided packing Polyamide fiber braided packing Packing braided with aromatic polyamide fiber. 3.5.1.8 Polysulfone fiber braided packing Packing braided with polysulfone fiber or polysulfone fiber impregnated with lubricant. 3.5.1.9 Inorganic fiber braided packing inorganicfibrebraidedpacking Packing made of inorganic fiber braided surface such as alumina, silicon carbide, ceramic, silicon amide, etc. 3.5.1.10 Glass fiber braided packing glassfibrebraidedpacking Packing made of braided or twisted glass fiber impregnated with lubricating oil. 3.5.1.11 Carbonized fiber braided packing carbonizedfibrebraidedpacking Packing made of organic carbon fiber braided after pre-oxidation and partial carbonization. 3.5.1.12 Fluoroplastic braided packing PTFEplastichraidedpacking Packing made of polytetrafluoroethylene plastic braided. 3.5.1.13 Composite braided packing compositebraidedpacking Packing made of two or more different materials. 3.5.1.14 Flexible graphite packing flexiblegraphitepacking Packing made of flexible graphite.
3.5.1.15 Flexible graphite composite packing flexiblegraphitecompositepacking Packing made of flexible graphite as the main material and compounded as needed. 3.5.1.16 Flexible graphite braided packing Flexible graphite braided packing is a packing made of flexible graphite.
3.5.1.17 Inhibiting flexible graphite packing Inhibiting flexible graphite packing is a shaped packing made of flexible graphite with corrosion inhibitor and sacrificial metal (such as NaNo: and Zn powder). 3.5.1.18 Corrugated packing Corrugated packing is a packing with multiple layers of concentrically arranged metal corrugated sheets sandwiched in non-metallic materials (see Figure 10). Figure 10 Corrugated packing
1-Asbestos;
3.5.1.19 Metallic soft packing Metallic soft packing is a packing made of soft metal wire or foil braided or rolled. 3.5.2 Special-shaped packing Special-shaped packing 2-Metal corrugated sheet
Special structure, initial sealing is formed when installed, and after being subjected to medium pressure, the sealing effect is automatically enhanced according to the self-tightening sealing principle to achieve automatic sealing packing.
3.5.2.1 Lip-type packing There are various types of lip-typepacking (V, U, L, Y flange type, etc.), and the special feature of the structure is that it has a sealing lip. The sealing ring and the inner and outer mating surfaces are interference fit. After installation, an initial seal is formed. After the medium pressure, the sealing lip opens outward and contacts the corresponding mating surface. When the pressure rises, the packing automatically seals due to the principle of self-tightening. 3.5.2.2 Squeeze-typepacking
squeeze-typepacking
JB/T6612-93
It is made of highly elastic materials with good deformation recovery and various types (O, T, X, square and triangle). The special feature of its structure is the height of the packing ring. The packing is larger than the depth of the groove in which it is installed, and the inner diameter is smaller than the diameter of the matching groove. When the surface is installed, it is pre-compressed to form an initial seal. When subjected to medium pressure, it squeezes against one side of the groove to increase the contact pressure and automatically seals (see Figure 11). Figure 11 Schematic diagram of extruded packing seal
4 Structure
4.1 Static sealing structure
4.1.1 Medium and low pressure vessel seals Medium and low pressure vessel seals are sealing structures for pressure vessels with working pressures less than or equal to 10 MPa. 4.1.1.1 Flange joint seal Flange connection, the seal is placed between the flange mating surfaces, and the seal is compressed by tightening the bolts. 4.1.1.2 Flat flange sealFlatface flangeThe flange mating surface is a flat sealing structure (see Figure 12). Figure 12 Flat flange seal
4.1.1.3 Male-female face flange sealThe flange mating surface is a concave and convex sealing structure (see Figure 13). Figure 13 Concave and convex flange seal
4.1.1.4 Tongue-grooved flange sealThe flange mating surface is a grooved sealing structure (see Figure 14). Groove flange seal
JB/T6612-93
4.1.2 High pressure vessel sealHigh pressure vessel seal The sealing structure of the pressure vessel with a pressure greater than 10MPa. 4.1.2.1 Double cone seal The double cone seal is a double cone ring. After the medium enters the annular gap between the double cone ring and the top cover, the double cone ring expands outward to produce a sealing structure with a self-tightening effect (see Figure 15).
Figure 15 Double cone seal
1-nut; 2-washer; 3-bolt; 4→flat cover; 5-double cone ring; 6-soft metal gasket; 7-sleeve end 4.1.2.2 "B\-ring seal B-ringseal bolt connection, relying on the interference between the wave crest of the "B" ring and the matching sealing groove on the end of the cylinder and the top cover to form a pre-tightening, under the action of the medium pressure, the \B\-ring expands outward to produce a radial self-tightening force sealing structure (see Figure 16). Figure 16 "B"-shaped ring seal
4.1.2.3C-shaped ring sealThe C-ring seal is a "C"-shaped ring. The height of the "C"-shaped ring (the distance between the upper and lower protruding parts) is compressed by the action of the upper inclined surface of the clamp, thereby obtaining sealing force. After the medium pressure acts, the upper and lower protruding parts expand outward to generate self-tightening force and improve the sealing force of the sealing structure (see Figure 17). bZxz.net
Figure 17 "C"-shaped ring seal
1-Pre-cover; 2-*C"-shaped ring: 3-Clamp; 4-Simplified end 4.1.2.4 Octagonal ring seal JB/T6612-93
Bolt connection, the octagonal ring is pre-tightened by the force of the screw and is self-tightened by the action of the medium pressure (see Figure 18).
Figure 18 Octagonal ring seal
1-top cover; 2-nut; 3-washer;
4-bolt; 5-octagonal ring 6-simplified end
4.1.2.5 Oval ring seal Oval ring seal bolt connection, the oval ring is pre-tightened by the force of the bolt, and the sealing structure is self-tightened under the action of the medium pressure (see Figure 19).
Figure 19 Oval ring seal
1~top cover: 2-nut: 3-washer
4--bolt; 5-catch ring, 6-simplified end 4.1.2.6 Wood's seal
The seal is an elastic seal. Under the adjustment of the tension bolt and the check bolt, the elastic pressure seal is pre-tightened through the top cover and the four-way ring, and under the action of the medium pressure, the floating top cover generates an axial self-tightening force of the elastic seal (see Figure 20). 432
Figure 20 Wood's seal
1-Top cover: 2-Check bolt; 3-Nut: 4-Rate check ring; 5-Four-way ring; 6-Pull screw: 7-Pressure seal: 8-Cylinder end 4.1.2.7 Casale's seal JB/T6612-93
Threaded sleeve connection, universal bolts press the pressure ring, and then press the sealing structure of the triangular seal (see Figure 21). 2
Figure 21 Kazari seal
1-top cover; 2 bolts 3-threaded sleeve;
4-pressure ring; 5-triangular gasket; 6 simplified part
4.1.2.8 Wedge-type seal (NEC seal) The plastic molded gasket is pre-tightened by the force of the bolts, and the floating top cover generates axial self-tightening force under the medium pressure (see Figure 22). Figure 22 Wedge-shaped gasket seal
1-nut; 2-bolt; 3-pressure ring; 4-mold-shaped gasket; 5-top cover; 6-simplified end; 7-cut clamp ring; 8-lifting bolt 9-washer circle 4.1.2.9 Triangular gasket seal triangular gasket seal bolt connection, under the pressure of the medium, the triangular gasket bends outward, and its inclined surface fits with the two inclined surfaces of the "V\-shaped groove to form a self-tightening sealing structure (see Figure 23).
Figure 23 Triangular gasket seal
1-top cover: 2-bolt: 3-nut;
4-washer, 5-triangular gasket, 6-body end
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