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Quadruple Offset Butterfly Valves

The Quattlok™ offset butterfly valve body includes a laminated metal seat ring, composed of alternating layers of corrosion-resistant alloy and composite graphite. Each individual lamination provides an independent seal, unaffected by damage to the others. While improving the long-term sealing properties, the resilience of this laminated design also allows lower operating torques.

Product Range

Design API Std 609, ASME B16.34, ASME B16.25
Valve Sizes 3” · 60”
Pressur Classes ASME Class 150, 300, 600, 900, 1500, 2500, JIS 10K, 20K, 30K, 40K, 63K
Body Style Wafer, Lugged, Double Flanged, Butt Weld Ends
Flange Accommodation ASME B 16.5:DN80 – DN600, ASME B16.47 Series A&B DN650-DN1500
API, JPI, BS, DIN, ISO available
Face-to-Face Dimensions API Std 609, ISO 5752, ASME B16.10, EN558
Pressur-Temperature Ratings ASME B 16.34 and 16.24
Working Temperature Range as Standard -29℃ to +350 ℃
With selection of suitable material and extended bonnet.
Low Temp. -196 ℃, High Temp. +600 ℃
Pressuer Test Shell Test:API Std 598, ASME B16.34
Seat leakage Test:API Std 598, ISO 5208, ANSI/FCI 70-2
Firesafe API Std 607
Leakage Rate API Std 598, ISO 5208 Rate A, Tight Shut Off, ANSI/FCL 70-2 Class VI

Bubble Tight Shut Off

Whereas a double offset metal-seated butterfly valve cannot achieve a tight shut-off, Quattlok realizes a tight shut-off using Qublock’s specially designed sealing mechanism in accordance with leakage class VI.

Friction Free Sealing

QuattlokTM uses a camming action, which reduces galling or scratching on the sealing surfaces between the disc and seat. This camming action also reduces the possibility of jamming between the sealing elements. The QuattlokTM disc’s sealing surface has different angles at all its points, and the sealing surfaces of the elliptical sealing system are in contact at the final position.

Cavity Free

The standard bushing protection ring is not effective in preventing fouling of the bushings associated with an aggressive line medium. The QuattlokTM bushing design guarantees that the line media does not get into the bushing cavity. QuattlokTM sealed bearings provide zero-to-low-ppm performance out of the stem packing. Thus, there is no cavity to allow a build-up of solids.

Higher Cv Values

A butterfly valve’s Cv value varies according to the disc angle and valve design. The optimal disc geometry and cavity-free flow passage of QuattlokTM provide minimum flow resistance and reduce the dead zone, which lead to a high Cv value.