Double gate knife gate valve-MDT

Features & Benefits

MDT Double gate knife gate valve is double gate valve widely used in the Pulp and Paper industry (recycling or secondary fibre processing) designed to handle high concentrated or contaminated media. In open position, both gates retract into the body and allow full flow. When closing, the gates push stock and contaminants as staples, wires… out of the body into the flow.
Stroke time is the half of conventional valves.


DN 100 to DN 600 (larger diameters on request)

Working pressure
DN 100 to DN 250: 10 bar
DN 300 to DN 400: 6 bar
DN 450: 5 bar
DN 500 to DN 600: 4 bar

All components subject to wear are replaceable.

Part Carbon Steel / Stainless steel
1 Body Carbon steel / AISI 316
2 Body Carbon steel / AISI 316
3 Gate AISI 304 / AISI 316
4 Packing PTFE impreg. synth. fibre + EPDM O-ring
5 Gland Follower Carbon steel / AISI 316
6 Yoke Carbon steel – Epoxy coated
7 Seat Rings CF8M
8  O-ring Nitrile
10 Piston Rod AISI 304 (1.4301)
11 Cylinder Aluminium
12 Gate Guards AISI 304 (1.4301)

Product description:

Bi-directional wafer type double gate knife gate valve
• Size range of DN100-600 (larger sizes upon request). See Dimension Charts for pressure rating
• Standard flange connection: DIN PN10 (EN 1092-2) and ANSI B16.5 (class 150)
Others available upon request
• Double acting pneumatic actuation
• Directives: 2006/42/EC (MACHINES), 2014/68/EU (PED) Fluid: Group 1(b), 2 (Cat. I. mod. A)
and 2014/34/EU (ATEX)


Internally machined cast or fabricated two-part bolted body with HMWPE liners for optimum
gate guiding and sliding when traveling
• Full port design for grater flow capacity and minimal pressure drop
• Double stainless steel gate, polished both sides to avoid jamming and seat damage
• Two cast stainless steel seat rings, easily replaceable, that protect the body
• Double packing with easy access and adjustable packing glands ensuring a tight seal. Long life
PTFE impregnated synthetic fiber plus EPDM O-ring. Wide range of packing materials available
• Blue epoxy-coating on all cast iron/carb on steel components
• Automated valves provided with gate guards in accordance with EU Safety Standards
• Other options: special materials, fabricated valves, etc.
• Actuation accessories: limit & proximity switches, mechanical stops, positioners, solenoid
valves, manual overrides, locking devices and fail safe systems


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