United Brass Quick and Slow Opening Blowdown valves In Stock

Manufacturer:
United Brass
Description:

United Brass Bottom Blowdown Valves:

Boiler blowdown is water intentionally wasted from a boiler to avoid concentration of impurities during continuing evaporation of steam. The water is blown out of the boiler with some force by steam pressure within the boiler. Bottom blowdown used with early boilers caused abrupt downward adjustment of boiler water level and was customarily expelled downward to avoid the safety hazard of showering hot water on nearby individuals.

Some boiler water treatments cause precipitation of impurities as insoluble particles anticipating those particles will settle to the bottom of the boiler before they become entrained in water circulating past the heat exchange surfaces. These water treatments often include compounds forming a sludge to entrap such particles; and boilers intended for such water treatment include a structure called a mud drum at the lowest part of the boiler. Bottom blowdown involves periodically opening valves in the mud drum to allow boiler pressure to force accumulated sludge out of the boiler. Similar blowdown connections at the bottom of water wall headers are blown down less frequently. Several short blowdown events remove sludge more effectively than a single continuous blowdown. Shorter blowdown events cause less significant changes in boiler water level, and are safer during periods of high steam demand.

Bottom blowdown piping drains the lowest parts of the boiler so it can be used to drain the boiler for servicing. Bottom blowdown piping must be of a diameter large enough to minimize the risk of being plugged with baked sludge. Modern boilers discharge bottom blowdown to a blowoff tank where the blowdown can flash and vent steam upwards without entraining water which might cause burns. A pipe near the bottom of the blowoff tank maintains a water level below the blowdown entry point and allows cooler water remaining from earlier blowdown events to drain from the tank first.

Item Name: Model 425 Quick Opening Blowdown Valve
Description:

Model 425 Quick Opening Boiler Blowdown Valve:

ASME Boiler and Pressure Vessel Code Sections 1 PG-42.1.122 and Power Piping Code ASME B 31.1 Table 126.1 reference steel valves to ANSI B16.34. The sliding disc provides a cleaning action that keeps the seating area clear of scale and debris.

DescriptionMaterial

Body - Steel A216 WCC Cover - Steel A216 WCC Gasket - Tanged Graphite Disc Spring - 17-7 Stainless Steel Disc Rivet - Carbon Steel Disc - 440C Stainless Steel Arm - Steel A216 WCC Stem - 410 Stainless Steel Stem Rivet - Carbon Steel Stem Spring - 17-7 Stainless Steel Packing - Graphite Packing Nut - 410 Stainless Steel Handle (1" & 1-1/4") - Ductile Iron 65-45-12 Handle (1-1/2" & 2") - Steel A216 WCC Cotter Pin - Plated Steel Body Bolts - Steel Grade 8 Hex Nuts - Steel Grade 8 Name Plate - Stainless Steel Drive Screws - Stainless Steel Operating Assembly - Bronze Connections - Threaded

Lead Time: Expedite Shipping Available . Most Sizes in Stock at Factory
Model 425 Quick Opening Diagram (Class 300)
Model Number Size Face to Face Weight, lbs. Price  
425 1" 3.80" 14.00 $489.87 Add to RFQ Dimensional Chart
425 1-1/4" 3.80" 14.00 $555.19 Add to RFQ Dimensional Chart
425 1-1/2" 4.50" 36.00 $650.99 Add to RFQ Dimensional Chart
425 2" 4.50" 46.00 $866.52 Add to RFQ Dimensional Chart
Item Name: Model 525 Slow Opening Blowdown Valve
Description:

Model 525 Slow Opening Boiler Blowdown Valve:

ASME Boiler and Pressure Vessel Code Sections 1 PG-42.1.122 and Power Piping Code ASME B 31.1 Table 126.1 reference steel valves to ANSI B16.34. The sliding disc provides a cleaning action that keeps the seating area clear of scale and debris.

DescriptionMaterial

Body - Steel A216 WCC Cover - Steel A216 WCC Gasket - Tanged Graphite Disc Spring - 17-7 Stainless Steel Disc Rivet - Carbon Steel Disc - 440C Stainless Steel Arm - Steel A216 WCC Stem - 410 Stainless Steel Stem Rivet - Carbon Steel Stem Spring - 17-7 Stainless Steel Packing - Graphite Packing Nut - 410 Stainless Steel Handle (1" & 1-1/4") - Ductile Iron 65-45-12 Handle (1-1/2" & 2") - Steel A216 WCC Cotter Pin - Plated Steel Body Bolts - Steel Grade 8 Hex Nuts - Steel Grade 8 Name Plate - Stainless Steel Drive Screws - Stainless Steel Operating Assembly - Bronze Connections - Threaded

Lead Time: Expedite Shipping Available . Most Sizes in Stock at Factory
Model 525 Slow Opening Diagram (Class 300)
Model Number Size Weight, lbs. Price  
525 1" 26.00 $975.37 Add to RFQ Dimensional Chart
525 1-1/4" 26.00 $1,045.04 Add to RFQ Dimensional Chart
525 1-1/2" 40.00 $1,140.84 Add to RFQ Dimensional Chart
525 2" 68.00 $1,384.69 Add to RFQ Dimensional Chart
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