Submittal Sheet

Big Mouth Vent P/N BJ-2BM & BJ-3BM
Vercal Piping Paern
The “Big Mouth” Vent & Crossover Trap
Low Pressure Steam Service
VAC-25 PSIG PMO
Features
• Large Air Venng Capability
• Factory Calibrated & Tested.
• Bronze Body, Forged Brass Cover, Union Nut & Tailpiece..
• Pipe Sizes: 1/2” & 3/4” NPT (1/2” special order only)
• Piping Paern: Vercal (Air Vent) or Horizontal for
(Crossover Trap) applicaon.
Capacity (EDR) Crossover Trap
Model Pressure Dierenal (PSIG)
Type Size Orice .25 .50 1 1.5
BJ-2CR 1/2” 5/16” 92 570 168 700
BJ-3CR 3/4” 5/16” 152 570 320 700
Part Materials
Cap Brass, ASTM CDA-377
Body Brass, ASTM CDA-377
Element Stainless Steel
Gaskets EPDM
Plug Brass
Seat Brass w/ Silicon O-ring
Front View Side View
Capacity (CFM) Vent
Model Size 1 oz. 2 oz. 3 oz.
BJ-2BM 1/2” 2.0 2.4 3.6
BJ-3BM 3/4” 2.0 2.4 3.6
Descripon
The Barnes & Jones “Big Mouth” vent is a thermostac main vent designed for maximum evacuaon of air and non-condensable gases from low-
pressure steam systems. Available in ¾” NPT (standard) and ½” NPT (special order). Recommended install at 8”-10”above the steam piping and
12” from the end of the steam main. Cross-over traps installed in the horizontal posion.
Model No. BJ-3BM
Barnes & Jones, 91 Pacella Park Drive, Randolph, MA 02368 ( Tel) 781-963-8000 (Fax) 781-963-3322 BarnesandJones.com [e-mail]
Crossover Trap Applicaon P/N BJ-2CR & BJ-3CR
Angle Piping Paern
Dimensions
Model Size A B C D Wt. # E
BJ-BM 1/2” & 3/4” 3-3/16” 1-1/8” 2-1/2” 3-1/16” 2 4-1/2”
BJ-CR 1/2” & 3/4” 3-3/16” 1-1/8” 2-1/2” 3-1/16” 2 4-1/2”
Part Part No.
Cap & Disc BJC5842-BM
Nut BJC346
Tailpiece 1/2” BJC544
Tailpiece 3/4” BJC1045
O-ring BJCS4870