Construction and Dimensions | Relief Valves
Bulletin 7377 Page 4
CONSTRUCTION MATERIALS
Valve Body and Spring Case
O-Ring Seat:
Gaskets
7377-03: Zinc
7377-1: Nitrile or Fluoroelastomer 7377-4: Nitrile or Fluoroelastomer
7377-03: Composition 7377-1: Composition 7377-4: Composition
7377-1: Aluminum
7377-4: Cast Iron Body with
Aluminum Spring Case
O-Ring Seat Holder and Washer: 7377-1: Aluminum
Spring
Diaphragm
7377-03: Zinc-Plated Steel 7377-1: Zinc-Plated Steel 7377-4: Zinc-Plated Steel
7377-03: Neoprene
7377-1: Nitrile or Fluoroelastomer Seat Washer 7377-4: Nitrile or Fluoroelastomer 7377-4: Stainless Steel
Diaphragm Plate
Orifi ce
Pitot Tube
7377-03: Zinc
7377-03: Aluminum
7377-1: Aluminum
7377-1: Zinc-Plated Steel 7377-4: Zinc-Plated Steel
7377-4: Brass or Stainless Steel
7377-4: Brass or Stainless Steel
Installation The 7377 Relief Valves can be installed in any position. However, the outlet connection must be protected against the entrance of rain, snow, insects, or any other foreign material. Flow through the valve must be as indicated by the flow direction arrow on the body. Refer to Fig. 3 for relief valve dimensions.
Temperature Capabilities With Nitrile and Neoprene Elastomers:
–20 to +150°F +20 to +300°F
With Fluoroelastomers:
4 1⁄8 dia.
7⁄8
7 1⁄8
3 1⁄16 dia.
8 11⁄16 max.
2 ¼
8 15⁄16
dimensions inches
1 ¾
2 1⁄8
¼ fpt pipe size
1" fpt pipe size
2 ¾
2" fpt pipe size
1 7⁄8
3⁄8
3 9⁄16
7377-1
7377-03
7377-4
Fig. 3. Relief Valves
DIMENSIONS SHOWN ARE SUBJECT TO CHANGE. PLEASE OBTAIN CERTIFIED PRINTS FROM FIVES NORTH AMERICAN COMBUSTION, INC. IF SPACE LIMITATIONS OR OTHER CONSIDERATIONS MAKE EXACT DIMENSION(S) CRITICAL .
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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