DSS Valves—Knife Gate Valve

Knife Gate Valves

Knife Gates come in a variety of styles, such as conventional, through-gate, lined, push-through, and guided shear gates. But don’t let this fancy nomenclature confuse you — if your Knife Gate fails on the regular, it’s probably due to the fact that it hasn’t been improved to meet the demands of today’s industrial processes.

At CGIS, we supply the world’s finest Severe Service Knife Gate Valves from DSS Valves, a manufacturer that specializes in Zero Leakage Severe Service Bi-Directional Knife Gate Valves. Designed to withstand the most extreme, abrasive, and corrosive applications, DSS Valves are manufactured using superior materials suited for mining, oil sands, chemical, and power industries.

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Guided Shear Gates

The Highest Performance Knife Gate

What are Guided Shear Gates?

The Knife Gate Valve began its journey in the Swedish Pulp and Paper industry in the 1920s. The market demanded an inexpensive valve for pulp stock applications, and a revolutionary valve design for the era was born. Known as the Knife Gate Valve, this new technology was capable of low pressure unidirectional general purpose isolation.

The simplistic and inexpensive design did have its problems. The hypothesis that the pulp stock in the water slurry would dewater around the closed gate and seat, thus  forming a tighter seal resulted in extremely high allowable leakage rates and fugitive emissions (leakage both inside and outside the piping system). Unfortunately, the original design often acted more as a sieve than a valve.

The 1950s saw a new patent for the Knife Gate Valve in the U.S. From here, a variety of designs (generations of knife gates) began to improve the functionality and capabilities of the valve. A fifth generation knife gate was invented in Switzerland in the 1960s, which became known as the Guided Shear Gate (GSG). Of the five generations of Knife Gate Valves, only the GSG was designed to actually “cut”.

Guided Shear Gate Key Design Elements

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