PRODUCTS
Semi-Metallic Gasket
Spiral Wound Gasket
Spiral Wound Gasket is made of alternate piles of V-preformed hoop and soft filler that are tightly and spirally wound together. According to the need of the mating flange, the gasket is provided with an outer ring, an inner ring or both outer and inner rings. The outer ring serves as a compression stop, anti-blowout device, which properly centers the gasket on the flange. The inner ring acts as a compression stop and is used to fill the annular space between the flange bores and the gasket inside diameter to minimize trubulence of process fluids and erosion of flanges faces. The spiral wound outer or inner rings are used primarily as reinforcement and are chosen instead of a solid metal ring, because of lower costs or because of limited space when the use of a solid metal ring would be prohibited due to the difficulty in fabrication or usage. ZW spiral wound gaskets can be manufactured in accordance with all relevant gasket standards to suit various flange designation such as ASME/ANSI B16.5, API 605 (ASME

Spiral Wound Gasket is made of alternate piles of V-preformed hoop and soft filler that are tightly and spirally wound together. According to the need of the mating flange, the gasket is provided with an outer ring, an inner ring or both outer and inner rings.
 
The outer ring serves as a compression stop, anti-blowout device, which properly centers the gasket on the flange. The inner ring acts as a compression stop and is used to fill the annular space between the flange bores and the gasket inside diameter to minimize trubulence of process fluids and erosion of flanges faces.
 
The spiral wound outer or inner rings are used primarily as reinforcement and are chosen instead of a solid metal ring, because of lower costs or because of limited space when the use of a solid metal ring would be prohibited due to the difficulty in fabrication or usage. ZW spiral wound gaskets can be manufactured in accordance with all relevant gasket standards to suit various flange designation such as ASME/ANSI B16.5, API 605 (ASME B16.47 Series B), MSS SP-44 (ASME B16.47 Series A), AWWA, CNS, DIN and JIS. The size is available from OD 1/2” to 5000mm. Please note the gaskets for non-standard flanges or heat exchanger with partitions are also readily available. Low stress spiral wound gasket could replace normal non-metallic gasket in ANSI 150#/300# Flange under lower torque, about only 60% of traditional spiral wound gasket.

●Style

Style Soft Filler Material
Graphite ePTFE Non-Asbestos Complex
Basic ZW#6590 ZW#7590 ZW#8590 ZW#9590
With Outer Ring ZW#6591 ZW#7591 ZW#8591 ZW#9591
With Inner Ring ZW#6592 ZW#7592 ZW#8592 ZW#9592
With Inner and
Outer Ring		 ZW#6596 ZW#7596 ZW#8596 ZW#9596
Double Spiral Custom-made

※ZW#6596 had approved by API 6FB fire test
Complex means customize by two soft filler materials as the following, e.g.: Graphite, ePTFE, Non-Asb., Mica, Ceramic…etc.
 
e.g. : ZW#9596 – Mica / Graphite / Mica
The complex soft filler, e.g. Mica , then Graphite, and then Mica, the construct designed for Mica filler covered the outside of Graphite filler to isolate oxygen. Graphite is flexible to meet the flange surface and allow the use of high temperature in the non-oxidizing space, and Graphite will not pollute the media.
 
●Working Range

 

Filler Material Temperature (°C) Pressure (bar)
Graphite -200~450(air)
650(reducing atmosphere)		 400
Expanded PTFE -200~260 400
Non-Asbestos -150~250 300
Mica / Graphite / Mica -200~750 100

 
●Selection Guide

 

Flange Face Raised Face Flat Face Male and Female Tongue and Groove Flat Face to Recess
Basic Unsuitable Unsuitable Suitable
1/2”~24”
150#~600#		 Suitable
1/2”~60”
300#~1500#		 Suitable
1/2”~60”
300#~1500#
With Inner Ring Unsuitable Unsuitable Suitable
1/2”~60”
150#~1500#		 Unsuitable Unsuitable
With Outer Ring Suitable
1/2”~24”
150#~600#		 Suitable
1/2”~24”
150#~600#		 Unsuitable Unsuitable Unsuitable
With Inner and Outer Ring Suitable
1/2”~60”
150#~1500#		 Suitable
1/2”~60”
150#~1500#		 Unsuitable Unsuitable Unsuitable

 

 

●Standard Thickness Selection

 

Gasket Thickness Flange Nominal Size
3.2 mm(0.125 in) < φ1500 mm
4.5 mm(0.175 in) < φ3000 mm
6.4 mm(0.250 in) < φ3500 mm
7.2 mm(0.285 in) < φ5000 mm

 

Order Code

ZW# 6  5   9   6  -   M     M    E

 Filler Material
6  Flexible Graphite
7  PTFE
8  Non-Asbestos
9 Other: Non-Asbestos w/Graphite、Graphite w/Mica

 

 

 

 

 

Style
0 Basic
1 With Outer Ring
2 With Inner Ring
6 With Inner and Outer Ring

 

Inner Ring Material

Winding Strip Material

Outer Ring Material
S Low Carbon Steel Y Inconel 600,625
E 304SS Y1 Inconel X750
L 304LSS W Incoloy 800(H), 825
G 316SS T Titanium
H 316LSS X1 Hastelloy B2, B3
O 310SS X2 Hastelloy C276
P 316TiSS X3 Hastelloy C22
Q 317LSS A Aluminum
J 321SS C Copper
K 347SS B Bronze
R 410SS Z Zirconium 702
U 430SS I1 Duplex S31803/S32205
F 904LSS I2 Alloy 20
M Monel 400 I3 Super Duplex S32750
N Nickel 200/201    

The Inner Ring Material should match the Winding Strip Material.
Back to list