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FIG970
These are specially designed uni-directional knife gate valves for use in pulverized coal mills in coal-fired thermal power plants. Design features a full port bore which is typically hardfaced to stand the highly erosive flow of pneumatically conveyed fine coal to the boiler. As these are used in the coal mills, the valves are designed to comply to the requirements of the NFPA-85 (2001) standard. The valve is a flanged design and the fange drilling conforms to the requirements of major coal mill manufacturers such as BHEL, Mitsui Babcock, Foster Wheeler and others. VAAS offers these valves in most of the sizes these valves are requested for- 300mm, 400mm, 650mm being very common sizes.
TYPICAL APPLICATIONS:
Mill Isolation in coal fired power plants
SPECIFICATIONS
TYPE: Wafer, flanged, uni-directional knife gate valve; rising stem hand wheel; specially designed for Coal Mill Isolation
SIZES AVAILABLE: 300,400,450,500,550,600,650mm (12, 16, 18, 20, 22, 24 and 16inch); full port
PRESSURE RATING: Designed to meet NEPA-85(2001) requirements
FACE-TO FACE: Complies with MSS SP-81 (upto 900mm (36") size)
DRILLING: Meets major mill OEM standards (Mitsubishi Babcock, Foster Wheeler, BHEL); also ANSI 150lb and others on request
MATERIAL AVAILABILITY: Standard; others on request
BODY: Cast steel, typically offered with hard faced flow bore
GATE: 304 steel; optional hard facing
SEAT / LEAKAGE:
- Metal-to-metal - As per ANSI Class IV
PACKING: PTFE syntex fiber standard; others on request
SUPERSTRUCTURE: Steel, epoxy painted
HANDWHEEL: Cast iron, epoxy painted
PNEUMATIC ACTUATORS: Suitable model is VAAS CCGCx & CCMCx Series
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