INJECTION QUILL TYPE DBB BALL VALVES

Product Overview

Chemical Injection Quill Type Double Block & Bleed Ball Valves. Alphex Engineers manufactures specialized Injection Quill Type DBB Ball Valves designed for safe and efficient chemical injection into process pipelines in Oil & Gas, Petrochemical, Refinery, and Offshore applications. These valves integrate a Double Block & Bleed arrangement with a customized injection quill assembly, allowing accurate chemical dosing directly into the process flow while minimizing turbulence, corrosion, and chemical accumulation near pipe walls.

Injection Quill DBB Ball Valves from Alphex Engineers are designed for applications such as :

• Corrosion Inhibitor Injection
• Methanol Injection
• Scale Inhibitor Injection
• Chemical Dosing Systems
• Sampling & Analyzer Systems

Design Features

• Integrated Double Block & Bleed Designe
• Compact Single-body Construction
• Positive Isolation During Maintenance
• Reduced Leak Paths
• Floating & Trunnion Mounted Design Options
• Full Bore & Reduced Bore Construction
• Side Entry & Top Entry Design
• Blow-out Proof Stem
• Fire Safe Design
• Anti-static Device
• Live Loaded Packing
• Bubble Tight Shut-off
• Sealant Injection Provision
• NACE MR0175 Compliance
• Extended Bonnet for Cryogenic Service (Optional)

Wake Frequency Calculation

To ensure mechanical integrity and long-term operational reliability, Alphex Engineers performs wake frequency evaluation and vibration assessment for Injection Quill assemblies as per applicable international engineering practices and client specifications.

• Wake frequency analysis helps in :
  • Preventing vibration-induced fatigue
  • Avoiding resonance conditions
  • Improving quill operational life
  • Ensuring stable chemical injection performance

End Connections

• NPT as per ASME B1.20.1
• BSPP / BSPT as per ISO 228
• Socket Weld
• Flanged Connections
• Customized End Connections

Material of Construction (MOC)

• Forged Materials
• ASTM A105
• ASTM A350 LF2
• ASTM A182 F316 / F316L
• ASTM A182 F51 / F53 / F55
• Exotic Materials
• Monel 400
• Hastelloy C276
• Inconel 625 / 718
• Titanium
• Duplex & Super Duplex Stainless Steel
• Quill Materials
• SS316 / SS316L
• Duplex / Super Duplex
• Hastelloy
• Monel
• Inconel

Operation Options

• Lever Operated
• T-Bar Operated
• Gear Operated
• Pneumatic Actuated
• Electric Actuated

Size & Pressure Range

• Bore Sizes : 10 mm / 14 mm / 19 mm
• Pressure Rating : Up to 10,000 PSI
• ASME Pressure Class : Up to 2500#

Injection Quill with Non-Return Check Valve Construction

Alphex Engineers also manufactures Injection Quill Type DBB Ball Valves with an integrated Non-Return Check Valve (NRV) construction for enhanced operational safety and process protection. This arrangement prevents reverse flow of process media into the chemical injection system during pressure fluctuations or shutdown conditions.

Key Features

• Integrated Non-Return Check Valve (NRV) Design
• Prevents Backflow from Process Pipeline
• Protects Chemical Injection Pumps & Instrumentation
• Maintains Unidirectional Chemical Injection Flow
• Improves System Safety & Injection Reliability
• Suitable for High-Pressure Chemical Injection Applications
• Compact Integrated Construction with Reduced Leak Paths
• Available in Spring Loaded Check Valve Design
• Soft Seat & Metal Seat Check Valve Options
• Suitable for Corrosion Inhibitor, Methanol & Chemical Dosing Systems