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Zhengji PTFE Spiral Wound Gasket Seal Gaskets
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Quick Details
Place of Origin:
Shandong, China
Brand Name:
Zhengji
Model Number:
Custom
Material:
Graphite, PTFE, non asbestos, vermiculite
Product Details
Product Description
A．Construction
Spiral-wound gaskets shall be constructed as alternate plies (circularlayers counted as revolutions) of preformed metal windings and pliant fillers that are spirally wound. Pliant fillers shall not extend below the metal winding on both contact faces of the gasket. Metal winding thick-ness shall be 0.190 mm ± 0.040 mm (0.0075 in. ± 0.0015in.). The thickness and density of all filling materials shall be determined by the manufacturer to ensure that the performance requirements of the standard specifications are met. In addition, for gaskets with flexible graphite filler material, filler thickness and density shall be determined by the manufacturer such that each finished gasket will compress to a thickness no less than 3.43 mm (0.135 In.).
1. Metal Joining
The inner windings shall have a minimum of three plies of preformed metal strip without filler. The initial two plies shall have spot welds spaced around the inner circumference. The minimum number of welds shall be three. The maximum distance between welds shall be 76 mm (3.0 in.). The outer windings, which shall have a minimum of three plies of preformed metal without filler. shall be spot-welded circumferentially with a minimum of three welds, the last of which shall be the terminal weld.
The distance of the first weld from the terminal weld shall be no greater than 38 mm (1.5 in). Up to four addi-tional loose
preformed metal windings beyond the terminal weld may be used to retain the gasket into the centering ring.
C．Centering Ring
All spiral-wound gaskets shall be furnished assembled into a centering ring. The centering-ring thickness shall be from 2.97 mm to 3.33 mm (0.117 in. to 0.131 in.) and suitably grooved on the inside diameter so as to retain the gasket.
1. Inner Ring
Inward buckling of spiral-wound gaskets has been iden-tified asa potential problem. Inner rings shall be furnished with all
spiral-wound gaskets having polytetrafluoroethylene (PTFE) filler material. Inner rings for flexible graphite-filled, spiral-wound gaskets shall be furnished unless the purchaser specifies otherwise.
For all filler materials, inner rings shall be furnished in spiral-wound gaskets for
(a) NPS 24 and larger in Class 900
(b) NPS 12 and larger in Class 1500
(c) NPS 4 and larger in Class 2500
Inner rings are required for these gaskets due to high available bolt loads, which may result in outer ring damage.
The inner-ring thickness shall be from 2.97 mm to 3.33mm (0.117 in. CO 0.131 in.).
E.General
All material shall be new material with all surface clean and free from defects, weld spatter, arc strike, rust, dirt, sand,
scale, paint or any other foreign substance.
Use of asbestos is strongly forbidden in any parts of the gaskets.
The gasket is sufficient to meet the maximum and minimum temperatures specified in each standard
Flexible graphite(FG)：-200℃~+650℃
When used in oxidizing medium, the maximum service temperature is 450 ℃
Polytetrafluoroethylene(PTFE)：-200℃~+200℃
Non-asbestos(NAS)：-100℃~+250℃
Phlogopite(magnesium mica)：≤1000℃
Vermiclite：≤1050℃
Ceramic(CER)：≤1400℃
Non-metal gasket with halogen and sulfur content of less than 0.01% (weight percent), chloride and fluoride dissolved in the leaching amount is not more than 15ppm and 10ppm, Sulphate ion concentration is not more than 100ppm.
Each gasket shall be legibly marked on the exterior surface of gaskets in accordance with the applicable standard. Marking shall normally be accomplished by stencilling and/or punching. The following items shall be indicated on all gaskets.
- Nominal size
- Rating or Class
- Material specification
- Manufacturer’s name or trade mark.
- Ring number (for ring joint gaskets)
- Item code (HQBJ code)
We have established, documented, implemented and maintained a quality management system (QMS) to ensure that our products meet the specified requirements, including the requirements of ISO 9001:2000.
Tolerances in dimensions shall be according to the relevant Codes, Standards and Specifications.
We take the following measures to prevent corrosion and mechanical damage during transportation, shipment and storage:
All gaskets thoroughly cleaned of all debris, trash, weld spatter, loose mill scale, tools and foreign matter and dried in
preparation for shipment. Gaskets shall be protected to withstand ocean/road transit and extended periods of storage at the job site for a minimum period of 18 months. Materials shall be protected to safeguard against all adverse environments, such as: humidity, moisture, rain, dust, sand, mud, salt, air, salt spray and seawater.
Rust protection for metal part of gaskets shall be performed according to the manufacturer's standard.
Austenitic stainless steel gaskets shall be protected from chloride attack during shipment or storage.
Spiral-wound gaskets shall be constructed as alternate plies (circularlayers counted as revolutions) of preformed metal windings and pliant fillers that are spirally wound. Pliant fillers shall not extend below the metal winding on both contact faces of the gasket. Metal winding thick-ness shall be 0.190 mm ± 0.040 mm (0.0075 in. ± 0.0015in.). The thickness and density of all filling materials shall be determined by the manufacturer to ensure that the performance requirements of the standard specifications are met. In addition, for gaskets with flexible graphite filler material, filler thickness and density shall be determined by the manufacturer such that each finished gasket will compress to a thickness no less than 3.43 mm (0.135 In.).
1. Metal Joining
The inner windings shall have a minimum of three plies of preformed metal strip without filler. The initial two plies shall have spot welds spaced around the inner circumference. The minimum number of welds shall be three. The maximum distance between welds shall be 76 mm (3.0 in.). The outer windings, which shall have a minimum of three plies of preformed metal without filler. shall be spot-welded circumferentially with a minimum of three welds, the last of which shall be the terminal weld.
The distance of the first weld from the terminal weld shall be no greater than 38 mm (1.5 in). Up to four addi-tional loose
preformed metal windings beyond the terminal weld may be used to retain the gasket into the centering ring.
C．Centering Ring
All spiral-wound gaskets shall be furnished assembled into a centering ring. The centering-ring thickness shall be from 2.97 mm to 3.33 mm (0.117 in. to 0.131 in.) and suitably grooved on the inside diameter so as to retain the gasket.
1. Inner Ring
Inward buckling of spiral-wound gaskets has been iden-tified asa potential problem. Inner rings shall be furnished with all
spiral-wound gaskets having polytetrafluoroethylene (PTFE) filler material. Inner rings for flexible graphite-filled, spiral-wound gaskets shall be furnished unless the purchaser specifies otherwise.
For all filler materials, inner rings shall be furnished in spiral-wound gaskets for
(a) NPS 24 and larger in Class 900
(b) NPS 12 and larger in Class 1500
(c) NPS 4 and larger in Class 2500
Inner rings are required for these gaskets due to high available bolt loads, which may result in outer ring damage.
The inner-ring thickness shall be from 2.97 mm to 3.33mm (0.117 in. CO 0.131 in.).
E.General
All material shall be new material with all surface clean and free from defects, weld spatter, arc strike, rust, dirt, sand,
scale, paint or any other foreign substance.
Use of asbestos is strongly forbidden in any parts of the gaskets.
The gasket is sufficient to meet the maximum and minimum temperatures specified in each standard
Flexible graphite(FG)：-200℃~+650℃
When used in oxidizing medium, the maximum service temperature is 450 ℃
Polytetrafluoroethylene(PTFE)：-200℃~+200℃
Non-asbestos(NAS)：-100℃~+250℃
Phlogopite(magnesium mica)：≤1000℃
Vermiclite：≤1050℃
Ceramic(CER)：≤1400℃
Non-metal gasket with halogen and sulfur content of less than 0.01% (weight percent), chloride and fluoride dissolved in the leaching amount is not more than 15ppm and 10ppm, Sulphate ion concentration is not more than 100ppm.
Each gasket shall be legibly marked on the exterior surface of gaskets in accordance with the applicable standard. Marking shall normally be accomplished by stencilling and/or punching. The following items shall be indicated on all gaskets.
- Nominal size
- Rating or Class
- Material specification
- Manufacturer’s name or trade mark.
- Ring number (for ring joint gaskets)
- Item code (HQBJ code)
We have established, documented, implemented and maintained a quality management system (QMS) to ensure that our products meet the specified requirements, including the requirements of ISO 9001:2000.
Tolerances in dimensions shall be according to the relevant Codes, Standards and Specifications.
We take the following measures to prevent corrosion and mechanical damage during transportation, shipment and storage:
All gaskets thoroughly cleaned of all debris, trash, weld spatter, loose mill scale, tools and foreign matter and dried in
preparation for shipment. Gaskets shall be protected to withstand ocean/road transit and extended periods of storage at the job site for a minimum period of 18 months. Materials shall be protected to safeguard against all adverse environments, such as: humidity, moisture, rain, dust, sand, mud, salt, air, salt spray and seawater.
Rust protection for metal part of gaskets shall be performed according to the manufacturer's standard.
Austenitic stainless steel gaskets shall be protected from chloride attack during shipment or storage.
Specification
|
Metal Winding & Inner Ring
|
Filler Materials
|
Outer Ring Materials
|
|
SS304(L)
|
Polytetrafluoroethylene(PTFE)
|
As Standard
|
|
Others
|
Vermiclite
|
Carbon Steel
|
|
Stainless Steel
|
Phlogopite(magnesium mica)
|
others
|
|
309
|
Flexible graphite(FG)
|
304(L)
|
|
310
|
Ceramic(CER)
|
316(L)
|
|
317L
|
Non-asbestos(NAS)
|
317
|
|
321
|
|
310
|
|
347
|
|
321
|
|
Alloy 20
|
|
347
|
|
Monel 400
|
|
410
|
|
Titanium1,2,7
|
|
Alloy 20
|
|
Nickel 200
|
|
Monel 400
|
|
Inconel 600,635
|
|
Titanium 1,2,7
|
|
incoloy 800,825
|
|
Nickel 200
|
|
Hastelloy B2
|
|
Inconel 600,635
|
|
C276
|
|
Incoloy 800,825
|
|
Duplex 31803
|
|
Hastelloy B2
|
|
Copper
|
|
C276
|
|
|
|
Duplex 31803
|
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