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DESCRIPTION The BT Model 21 Series knife gate is a bi-directional lug type valve designed according to MSS-SP-81 and TAPPI TIS 405-8 for industrial service applications. The design of the body and seat assures non-clogging shut off on suspended solids in industries such as: • Pulp and Paper • Chemical plants
• Power plants • Wastewater
FEATURES
• Body: One piece integrally cast stainless steel body with reinforced ribs in larger diameters for extra body strength. Internal cast guides allows for tighter shutoff. Bore design according to MSS-SP-81 and Tappi TIS 405-8. Internal design avoids any build up of solids that could prevent valve from closing. • Gate: Standard AISI 316 stainless steel gate. Gates polished and lapped for a greater seal between the gate and both the packing and seat.
• Seat: (resilient) Retained in the valve body internal groove by its trapezoidal shape. Standard EPDM; also available in different materials such as Viton, nitrile, etc. • Packing: Standard braided PTFE impregnated fiber with EPDM o-ring for better shut off, with an easy access packing gland ensuring a tight seal Long-life braided packing is available in a wide range of materials. • Stem: The standard stainless steel stem offers a long corrosion resistant life. For rising stem handwheel actuators only, a shaft collar is provided for protection and regulation of the stroke. • Actuators: All actuators supplied by ORBINOX are interchangeable, and supplied with an standard mounting kit to allow for installation on site. • Yoke or Actuator Support: Made of Epoxy coated steel (stainless steel available on request). Compact design makes it extremely robust even under the most severe conditions.
• Epoxy Coating: The epoxy coating on all ORBINOX cast iron and carbon steel valve bodies and components is electrostatically applied making them corrosion resistant with a high quality finished surface.
SPECIFICATIONS Sizes
Working pressure Standard flange connection Directives
DN 2"/50 to DN 24”/600 (larger diameters on request) DN 2"/50 to DN 24”/600: 150psi / 10kg/cm²
ANSI B16.5 (class 150) Others on request
DIR 98/37/CE (MACHINES)
DIR 97/23/CE (PED) Fluid: Group 1(b), 2 (Cat. I, mod. A) DIR 94/9/CE (ATEX) Please contact Rawson for information and availability of categories and zones.