VALQUATIGHT GASKET
Spiral Wound Gaskets use Non-Asbestos inorganic paper, VALQUAFOIL™ (expanded graphite) and VALFLON™ (PTFE) tape as filler materials,
and exhibit good elasticity by means of a V-shaped hoop.
VALQUA No. 6590
Product name BLACKTIGHT (basic design)
Features1 Spiral wound gasket using VALQUAFOIL tape applied as filler
material
Features2 The basic-shape gasket is used for male-female and tongue and
groove flanges, bonnets of valves, as well as covers for pressure
vassels, towers, and tanks. It only requires a narrow width, and
safe for use under high pressure.
Features3 Excellent airtightness greatly improves sealing performance
against gas in general and vacuum.
Features4 Excellent response to heat and pressure cycles reduces the
frequency of retightening.
Features5 They also have excellent radiation resistance (products complying
nuclear power specifications are available).
Applicable fluids Water, Sea water, Hot water, Steam,Crude oil, Alcohol, Animal & vegetable oil, Heat transfer oil,General solvent, Weak
acid, Weak alkali,Strong oxidizing acid, strong alkali,Air, Nitrogen gas, Inert gas,Exhaust gas,Inflammable
gas,Poisonous,Extremely low temperature liquids,
Inappropriate fluid Oxidizing acids such as hot, concentrated sulfuric acid, concentrated nitric acid and oxygen.
Application In particular best suited as gaskets for use handling high temperature & high pressure steam (except HTS), as well as
very low temperature fluids such as LNG, liquid nitrogen and liquid hydrogen.
■ Dimensions
Standard Flange
For JIS pipe flanges＝10K、16K、20K、30K、40K、63K For JPI and ANSI pipe flanges＝Classes 150, 300, 400, 600, 900, 1500, 2500 Gaskets
complying with other standards such as ASME and MSS are also available. ▼ For non-st
Non-Standard Flange
Gasket thickness（mm） Manufacturing ranges
1.6(P) 10∼150
3.2(T) 10∼1500
4.5(V) 10∼3000
6.4(W) 300∼3400
Products with a gasket thickness of 6.4 mm can be fabricated with the outer diameter of the outer ring of up to 3,500.
In case of products with gasket thickness of 1.6 mm, only the basic type with hoop made of SUS316 are available.
"( )" shows thickness classifications.
Round type gaskets are available.
■ Design data
Basic design With outer ring With inner ring With inner/outer ring
Filler material： VALQUAFOIL tape
■ Available ranges
Temperature（℃） Pressure（MPa）
-270∼450 30.0
1. Temperature and pressure show individual service limits.
2. The above temperature ranges vary depending on the material used for the hoops and the inner & outer rings.
■ Design criteria
Minimum design Recommended Recommended
Gasket factor m seating stress"y" tightening stress tightening stress
（N/mm2） （MPa）Liquid （MPa）Gas
3.0 68.9 35.0 50.0
The recommended tightening stress are the pressures required under normal conditions, and correspond to the projected area of the gasket,
where fluid pressure is not taken into consideration.
Separate consultation is required, where flange deformation is anticipated for large diameter gaskets.
■ The fluid-wise available ranges
■ Upon placing order
■ FAQ
■ VALQUA HAND BOOK TECHNICAL DATA
■ VALQUA HAND BOOK DIMENSIONAL DATA
(C) 2019 VALQUA, LTD. All rights reserved.
