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Item # 180-1/2, 1/2" Y Blow-Off Valve

Lunkenheimer Fig. 180 "Y" Blow-off valves conform to the ASME Boiler Code and are suitable for boiler service up to 80% of valve working steam pressure. Also provide approximate flow and drainage of a gate valve and may be used as such on other services. Also for throttling and fine regulation.

Bodies and Bonnets ASTM B61 Type S-1 Steam Bronze
Seat opening permits almost unrestricted flow. Cylindrical guides insure proper disc seating.

Union Bonnet
Assures strong, pressure-tight connections, facilitates cleaning and inspection.

Discs and Seat Rings
Regrindable, renewable. NT4 nickel alloy.

Back Seats
Repackable when disc is wide open under pressure.

Specifications  · Principal Parts and Materials



1/2 in

Dim. A

5 13/11 in

Dim. E

8 3/2 in

Dim. G

5 1/2 in

Dim. M

4 11/16 in

Dim. H

18 in


7.9 lb

Body Material

Bronze with Metal Seat

Principal Parts and Materials
Part Fig Material ASTM
Body & Bonnet   S-1 Steam Bronze B61
Disc 180 NT Nickel Alloy  
180-T Teflon
Stem   Stemalloy, Rod B371
Seat Ring 180 NT Nickel Alloy  
180-T Integral/Bronze
Packing   JC168 Kevlar  

Bronze Valves comply with ANSI B1624 arc MSS-S5P-80


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