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The Severe Service Knife Gate Valve by DSS has a zero-leakage bidirectional design that exceeds specifications set by ASME, API, and MSS up to Class 900.

Its distinctive feature is a guided shear gate which consists of a shearing tip, mechanically retained axial seat, and internal gate guides. The guides completely support the gate through a full stroke and prevent any deflection. The shearing tip with a bevelled edge can cut through solids, fibre, paste, and scale repeatedly and flush them into the pipeline. A primary seal and transverse secondary seal work in tandem to prevent fugitive emissions, leakage, and discharge.

Designed for the harshest abrasive conditions, the DSS SSKGV provides true bidirectional zero-leakage isolation when solids are present in the pipeline. You can choose from a range of material options to handle any corrosive media.

Technical specifications





Size range

DN50–900 (2–36”)

Pressure class

153 bar

End connections

SP 135 Short, ASME B16.5/B1647
SP 135 Long, ASME B16.5/B1647
AS 2129 Table D/E
DIN 2501 PN10/PN16/PN25/PN40

Actuator options

Gear operated

Material specifications


Titanium, 316 and 317 stainless steel, 17-4 Ph, AL-6XN, Alloy 20, carbon steel, cast iron, Duplex 2205, Hastelloy C-276, Ni-Resist 1, Ductile Ni-Resist, and Super Duplex 2507
Contact us for other materials


17-4 Ph, 316 stainless steel, AL-6XN, carbon steel, D55 tool steel, Duplex 2205, Hastelloy C-276, Super Duplex 2507, and titanium

Seat and max temperature

Aflas (-4°C to 230°C)
Buna N (-34°C to 121°C)
Chemraz (-28°C to 315°C)
EPDM (-54°C to 129°C)
GFLT Viton (-34°C to 225°C)
Graphite (Depends on valve body materials)
Polyurethane (-34°C to 82°C)
Teflon (-200°C to 260°C)
Viton (-26°C to 225°C)

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