Elite Flow Control’s Double Block And Bleed (DBB) Ball Valves are high-integrity, safety-critical isolation valves designed to provide two independent sealing barriers against line pressure with a cavity bleed facility between them – all within a single compact valve body. Available in both Floating Type (CL150-1500) and Trunnion Type (CL150-2500) configurations, and in sizes from 2″ to 24″ (DN50 to DN600), these valves are the preferred specification wherever positive double isolation and the ability to monitor or vent the cavity between seals is required by process safety or regulatory standards.
The Double Piston Effect seat design ensures that both upstream and downstream seats provide an independent, pressure-energised seal – meaning that even if one seat fails, the second seat continues to hold pressure, maintaining system integrity. The integrated bleed connection allows operators to verify seal integrity, depressurise the cavity, or introduce sealant between the two seats without removing the valve from the pipeline – a critical capability for safe maintenance, instrument calibration, and pipeline pigging operations.
The forged body construction, combined with flange connections per ASME B16.5 and actuator mounting flanges per ISO 5211, ensures full dimensional and interface compatibility with standard pipeline equipment and actuator packages. Lever operation is lockable and removable as standard, with gear box operation and actuator mounting available for larger sizes and automated applications.
An exceptionally comprehensive range of seat and seal materials is available – from standard PTFE and RPTFE through to PEEK, Metal seat, VITON, HNBR, and beyond – covering operating temperatures from -148°F to 500°F and pressure classes from CL150 to CL2500. This makes Elite Flow Control DBB Ball Valves suitable for virtually any process fluid, temperature, or pressure condition across oil & gas, petrochemical, chemical, power generation, and offshore industries.
Key Features:
- Double block and bleed – two independent seals with cavity vent in a single body
- Double piston effect seat design for pressure-energised sealing
- Available in floating type (CL150-1500) and trunnion type (CL150-2500)
- Forged body construction
- Flange connection per ASME B16.5
- Actuator mounting per ISO 5211
- Lockable and removable lever as standard
- Comprehensive soft seat options: PTFE, RPTFE, PCTFE, Nylon, Molon, Devlon, PEEK, Metal
- Comprehensive seal options: EPDM, NBR, HNBR, HNBR AED, VITON, FVMQ
- Size range: 2″ ~ 24″ (DN50 ~ DN600)
- Pressure classes: CL150 ~ CL2500
Model No.: EFC-02BV1R7 Size: 2″ ~ 24″ (DN50 ~ DN600) Class: CL150 ~ CL2500
Product Range By Service Class
| Type | CL150-600 | CL900 | CL1500 | CL2500 |
|---|---|---|---|---|
| Floating Type | 1/2″ ~ 6″ | 1/2″ ~ 2″ | 1/2″ ~ 2″ | 1/2″ ~ 1″ |
| Trunnion Type | 2″ ~ 24″ | 2″ ~ 24″ | 2″ ~ 24″ | 2″ ~ 12″ |
Specifications
| Parameter | Value |
|---|---|
| Body | Forged |
| Flange Connection | ASME B16.5 |
| Face to Face | Per supplier recommendation |
| Actuator Mounting Flanges | Per ISO 5211 |
| Lever | Lockable and removable |
| Operation | Gear box as standard / Actuator mounting available |
Design Features
- Forged Body
- Flange connection per ASME B16.5
- Face to face per supplier recommendation
- Lever lockable and removable
- Gear box operation as standard
- Actuator mounting flanges per ISO 5211
- Soft Seat or Metal Seat
- Double Piston Effect
Vent Connections:
- Integral Vent Valve – Needle Type
- Screwed Bonnet or Flanged Bonnet Screwed Vent Valve – Ball Valve
Seat & Seal Design Features
Optional Seat Selections
| Material | Operating Temperature | Operating Pressure | Description |
|---|---|---|---|
| PTFE | -112 ~ 248°F | 150LB | Fluorocarbon-based polymer – lowest operational torque due to low coefficient of friction |
| RPTFE | -80 ~ 120°C | 150-600LB | Reinforced PTFE – enhanced strength, stability and wear resistance |
| PCTFE | -112 ~ 248°F / -190 ~ 120°C | 150-300LB | Thermoplastic chlorofluoropolymer – dimensionally stable, rigid, resistant to cold flow, very low gas permeation |
| Nylon | -31 ~ 248°F / -45 ~ 250°C | 150-300LB | Ideal for high pressure air, oil and gas media – not suitable for strong oxidising agents |
| Molon | -49 ~ 482°F | 150-300LB | Modified Nylon (Nylon + MoS2) – similar to nylon but with higher operating temperature |
| Devlon | -29 ~ 80°C | 150-1500LB | Polyamide with additives – wide application range, excellent wear, low friction, improved impact strength |
| PEEK | -20 ~ 176°F | 150-1500LB | High performance engineered thermoplastic – excellent water/chemical resistance, unaffected by hot water/steam |
| Metal | -29 ~ 130°C / -20 ~ 266°F | 150-1500LB | Used for high temperature, wear resistance, impact resistance, granular media conditions |
| – | -50 ~ 150°C / -58 ~ 302°F | 150-2500LB | – |
| – | -100 ~ 260°C / -148 ~ 500°F | 150-2500LB | – |
| As Request | – | 150-2500LB | Custom seat materials available on request |
Optional Seal Selections
| Material | Operating Temperature | Operating Pressure | Description |
|---|---|---|---|
| EPDM | -46 ~ 150°C / -50 ~ 302°F | 150-600LB | Synthetic rubber – excellent chemical resistance to acids and alkalines; not suitable for petroleum |
| NBR | -40 ~ 80°C | 150-2500LB | Resistant to mineral oil-based lubricants, greases, hydraulic fluids, hydrocarbons and water |
| HNBR | -40 ~ 80°C / -40 ~ 176°F | 150-2500LB | Similar media stability to NBR with significantly better heat and oxidation stability |
| HNBR AED | -40 ~ 80°C / -40 ~ 176°F | 150-2500LB | Typically used in high pressure oil and gas applications |
| VITON | -40 ~ 176°F | 600-2500LB | Fluorocarbon elastomer – compatible with broad range of chemicals, excellent resistance to aggressive fuels |
| FVMQ | -29 ~ 200°C / -20 ~ 392°F | 150-2500LB | Silicone polymer – far more resistant to oils and fuels than standard silicones |
Model Denote: EFC = Elite Flow Control | 02 = Size in inch | BV = Ball Valve | 1 = 150Lb | R = RF End | 7 = Trunnion, DBB Type
