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All Categories > IN LINE CHECK VALVES > Threaded Check Valves > Vacuum Breaker Threaded In-Line Check Valves > Prod. # 8033  
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Prod. # 8033, 1" 303 SS BSSV Style Vacuum Breaker Threaded In-Line Check Valve



DFT® Vacuum Breakers provide effective protection against collapse of pressure vessels, tanks and rolls. They prevent condensate "back-up" when equipment is shut down or inlet steam is reduced by modulating control valves. In piping systems, DFT® Vacuum Breakers are used to break siphons, prevent pipe collapse during transient pressure drops, and to provide addition of air on the downstream side of check valves to dampen water hammer.




Specifications  · Materials of Construction  · Soft Seat Materials  · Springs  · Valve Selection Specifications  · Codes and Standards  · Features  · Options

Specifications

Series

Vacuum Breaker

Style

BSSV

Size

DN 25
1 in

Nominal Size (MNPT) A

1.00 in

Unthreaded Inlet Bore B

0.56 in
14 mm

Cv

5.8

Friction Loss (Feet of Pipe)

7

Friction Loss (Meter of Pipe)

2.1

Valve Cracking Pressure1

0.60 psi
0.041 bar
16.7 in.water
424 mm.water
31.1 mmHg

Valve Cracking Pressure Tolerance

±10%

Approx. Net Weight Each

0.38 lb
0.2 kg

Cold Working Pressure2

View
0 psig
2500 psig
0 barg
172 barg
1 Cracking pressure for vertical flow will be slightly different: upward flow, slightly higher; downward flow, slightly less.
2 Contingent on service ratings of matching pipe and fittings.


Materials of Construction

Seat

303 SS

Disc

316 SS

Guard

303 SS

Spring

316 SS

Retaining Ring

316 SS


Soft Seat Materials

Soft Seat Materials1

Buna-N (-70 to 250°F)
EPDM (-75 to 300°F)
TFE®-Viton (-40 to 400°F)
Viton® (-40 to 400°F)
Zelon® (37 to 400°F)
1 Buna-N and Viton are not suitable for steam service.


Springs

Springs

Inconel® X-750 (-460 to 700°F)
316 SS (-460 to 450°F)


Valve Selection Specifications

ENDS

NPT

ASME

2500 CWP

Materials

303 SS


Codes and Standards

ANSI

View
B1.20.1

MSS

SP-25

Options

Inconel® 750 Spring
Soft Seat


Features
  • 1" to 4" size
  • 450 to 6000 CWP
  • Threaded O.D. (MNPT)
  • Unthreaded inlet bore
  • Stainless Steel Construction
  • Spring-assisted silent closing
  • Horizontal or vertical installation
  • Tight shut-off - lapped disc & seat
  • Easy maintenance
  • Versatile




Options
  • Inconel® 750 Spring
  • Soft seat




 MORE IMAGES 

·  Saturated Steam Pressure


 DOWNLOADS 

Cut Sheet (Vacuum Breaker Threaded In-Line Check Valves)
(PDF, 96KB)

Water Hammer
(PDF, 29KB)

Features
(PDF, 28KB)

NACE
(PDF, 29KB)

Pressure Temperature Rating
(PDF, 58KB)

Applications
(PDF, 28KB)

Technical Information
(PDF, 43KB)

Zelon Technical Information
(PDF, 34KB)

Design Flexibility eBook



 CHECK VALVE RFQ 


Non-Slam Check Valve RFQ
Non-Slam Check Valve RFQ

 8003-RK 


Repair Kits (8006-RK)
8003-RK
Repair Kits

 
 
  DFT® Inc.
140 Sheree Blvd. | PO Box 566 | Exton, PA 19341-0566
Toll Free: 1.800.206.4013
Phone: 610.363.8903 | FAX 610.524.9242

Email us at: dft@dft-valves.com
 
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