Flanged monoflange double block and bleed valve stainless steel

This high-performance monoflange double block and bleed (DBB) valve features an integral forged body integrating two isolating ball valves and one venting needle valve. Designed for severe instrument isolation, it provides a compact alternative to traditional multi-valve systems, effectively reducing leak paths, saving installation space, and ensuring maximum safety.

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Detailed Product Introduction

The integral flanged Monoflange DBB (Double Block and Bleed) valve is a state-of-the-art solution designed for primary instrumentation isolation in high-pressure fluid systems. Machined from premium forged stainless steel bar stock, it replaces conventional multi-valve process piping configurations with a singular, compact unit. The configuration incorporates two inline ball valves for secure process isolation (Block) operated by heavy-duty levers, and a central T-bar operated needle valve for safe system de-pressurization (Bleed). This integrated design dramatically minimizes potential emissions and fugitive leak paths while providing standard flange-to-thread transitions for pressure gauges, transmitters, and sampling lines.

Technical Specifications

Valve Architecture: Monoflange Type Double Block and Bleed (DBB) Configuration
Valve Configuration: Twin Ball Valves (Block) & Single Needle Valve (Bleed/Vent)
Body Material: Forged Stainless Steel 316 / 316L / A182 F316
Ball & Stem Material: Heavy-duty Stainless Steel 316 (SS316)
Needle Tip Design: Non-rotating hardened tip for galling prevention and bubble-tight shut-off
Ball Valve Seats: Reinforced PTFE (RPTFE) / PEEK / Devlon (for high-pressure scaling)
Needle Valve Packing: PTFE standard / Graphite (for high-temperature/fire-safe setups)
Inlet Connection: Raised Face (RF) Flange (ANSI/ASME B16.5 compliance)
Flange Rating Options: Class 150, Class 300, Class 600, up to Class 2500
Outlet Connection: 1/2" NPT Female (or 1/4" NPT customizable)
Bleed/Vent Connection: 1/4" NPT Female / 1/2" NPT Female with plug option
Nominal Pressure Rating: Up to 6000 PSI (413 Bar) as standard instrument rating
Temperature Operational Range: -29°C to +200°C (PTFE seats) / up to +400°C (Graphite packing)
Isolating Lever Handles: Dual Stainless Steel 304 Levers with vinyl sleeve grips (stamped "BALL VALVE ON/OFF")
Vent Valve Handle: Stainless steel heavy-duty T-bar handle for fine throttle venting
Leakage Testing Standard: API 598 / BS EN 12266-1 (Zero visible leakage / Bubble-tight)
Anti-Blowout Feature: Blowout-proof stems integrated into both ball and needle mechanisms
Fugitive Emissions Compliance: Engineered to meet ISO 15848-1 environmental standards
Design Standards: Developed and certified per ASME B16.34, ASME B31.3, and ASME B16.5
Surface Inspection & Finish: Fully passivated body with high-precision CNC-machined flange sealing face