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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)

How we help you choose the right valves:

1. Tell us what you need

Talk to our experts about your application, which valves and controls you need, and any repair or maintenance concerns.

2. Choose the right solution

We’ll do all the analysis, discuss the options with you, and make a recommendation—the valves we’d choose in your shoes.

3. Get the job done

Get the right valves for the job, fitted out, tested, and ready to install. We’ve got your back with ongoing repairs and maintenance.

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