Valves
Double Block & Bleed Valves
Our double block & bleed valves combine two isolation valves and a bleed valve in one integrally forged body, giving positive primary isolation at pressure take-offs on vessels and process pipe. One compact valve replaces a multi-valve assembly, with fewer leak paths, less weight and less bolting, and instruments can mount directly on the outlet.
Pressure class
ASME 150 to 2500
Sizes
1/2" to 3"
Valve types
Ball, OS&Y and needle
Ends
ASME B16.5 flanged, NPT
Key features
Primary isolation, secondary isolation and bleed in one forged body, with fewer potential leak paths
Ball, OS&Y or needle valves in any combination, to suit the duty
Fire tested to API 607, with anti-static design and lockable handles as standard
Wetted parts to NACE MR0175 / ISO 15156 for sour service
Technical specifications
| Design | Integral one-piece forged body: primary isolate, secondary isolate and bleed |
|---|---|
| Valve types | Ball, OS&Y needle or globe-type needle valves, in any combination |
| Pressure rating | ASME B16.34 Class 150 to 2500 Ball valves up to 10,000 psi (690 bar) |
| Temperature range | Up to +250 °C, depending on seat and packing |
| Sizes | 1/2" to 3"; reduced and full bore |
| End connections | Flanged to ASME B16.5; NPT to ASME B1.20.1 |
| Body | Stainless steel 316 (ASTM A182 F316), carbon steel (ASTM A105), duplex (F51) and nickel alloys (Alloy 625) |
| Seats and packing | RPTFE or PEEK seats; graphite packing |
| Sour service | Wetted parts to NACE MR0175 / ISO 15156 |
| Testing | Pressure tested to API 598 Fire tested to API 607 |
| Marking | To MSS SP-25 |
Configurations
Flange × flange
Flange × NPT
NPT × NPT
Ball / ball / needle
Needle / needle / needle
Reduced or full bore
Related products
Double block & bleed in a body that bolts straight onto the process flange.
Isolate, equalise and vent pressure instruments from one compact block.
Quarter-turn valves for fast, positive shut-off on instrument and process lines.
Need a custom solution?
Send us your drawing or specification. Our engineers will work out the right part with you.
