RF Valves RF-INSAMCOR MLB Knife Gate Valves are sealed-design knife gate valves built for large-line slurry, process, and liquid handling applications where reliable shutoff and full-bore flow are important.
The MLB family is designed for 28″ to 48″ valve sizes and uses a mechanically retained extruded body seal, guided gate stroke, and combination transverse seal with adjustable stuffing box and gland design.

Its full-bore flow area helps reduce internal restrictions, while self-cleaning flush-out corners help limit material buildup in the sealing area.
Available in Fusion Bonded Epoxy and Soft Rubber Lined configurations, RF-INSAMCOR MLB valves support demanding industrial and municipal applications requiring bi-directional leak-proof sealing, large-diameter valve performance, and multiple actuation options.
Key Characteristics
- Product Type: Sealed knife gate valve
- Product Family: RF-INSAMCOR MLB
- Size Range: 28″ to 48″
- Design: Sealed design with full-bore unrestricted flow area
- Seal Design: Mechanically retained extruded body seal
- Gate Guidance: Gate guided through full length of stroke
- Sealing Performance: Bi-directional leak-proof sealing
- Configurations: Fusion Bonded Epoxy and Soft Rubber Lined
- Temperature Rating: Up to 390°F
- Max Operating Pressure: Up to 200 psi depending on size
- Flange Drilling: ASME B16.5 Class 150, AS2129 Table D&E, PN10, PN16
- Actuation: Manual, manual bevel gear, pneumatic, electro-mechanical, and hydraulic
Ideal Applications
- Large-diameter slurry handling
- Municipal water and wastewater systems
- Mining process lines
- Chemical process applications
- Power plant fluid handling
- Pulp and paper process systems
- Desalination and industrial liquid handling
Industries Served
- Municipal
- Mining
- Chemical
- Power
- Pulp & Paper
- Desalination
- General Industrial







