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DBB5600 / DBB6600
High Performance, Double Block & Bleed
Class 150 / 300
Knife Gate Valve
The DBB5600, and DBB6600, are high performance, double block and bleed knife gate valves specifically designed for critical shut-off applications in the pulp & paper, mining, oil & gas, and power generation industries. The dual gate design with perimeter seat and dual transverse seals ensures reliable, bidirectional shut-off for critical applications including slurries, dry materials, gases, and corrosive fluids. The DBB5600, and DBB6600, can be configured and customized for many types of severe service and aggressive process applications.
Please contact us for pricing and availability.
Product Information
Sizes Available
- 2” to 24”(50mm to 600mm)(larger sizes available on request)
Pressure Rating
- ASME Class 150 (DBB5600)
- ASME Class 300 (DBB6600)
Temperature Rating (Transverse Seals)
- EPDM: –22°F to 300°F (–30°C to 150°C)
- Viton B: 5°F to 392°F (–15°C to 200°C)
- Viton GFLT: –40°F to 392°F (–40°C to 200°C)
- AFLAS: 14°F to 446°F (–10°C to 230°C)
- Buna-N (NBR): –22°F to 212°F (–30°C to 100°C)
- Polyurethane: –40°F to 176°F (–40°C to 80°C)
- FFKM: –4°F to 572°F (–20°C to 300°C)
Standards & Approvals
- Design: MSS SP-135, ASME B16.34
- Flanges: ASME B16.5, B16.47 Series A
- Testing: MSS SP-151, API 598
- Markings: MSS SP-25
- Mounting: ISO 5211
- Quality: MSS SP-55, ISO 9001:2015
- Registration: CRN
Features & Benefits
Various Actuation Options
Various actuation options are available, including handwheel, bevel gear, pneumatic, hydraulic, and electric.
Direct Mounting
ISO 5211 mounting pattern allows direct mounting of various actuation options.
Provision Sensors
Provision for proximity sensors allows easy integration for position feedback.
High Visibility Clevis
High visibility clevis provides easy identification of valve position.
1 Various Actuation Options
2 Direct Mounting
3 Provision Sensors
4 High Visibility Clevis
Lockout Pin
Lockout pin included as standard for maintenance safety.
Safety Covers
Safety covers are included as standard to protect operators.
Transverse Seal Design
Transverse seal design with scrapers reduces material buildup and provides reliable sealing.
Low Friction Gate Glides
Low friction gate glides prevent gate interference with the valve body and reduce torque requirements
5 Lockout Pin
6 Safety Covers
7 Transverse Seal Design
8 Low Friction Gate Glides
316SS Gate
316SS gate standard. Available in various materials and exotic alloys. Low friction and high wear coatings are available for the most demanding processes.
Extended Flushing Ports
Extended flushing ports prevent material buildup on sealing surfaces and improve reliability.
Replaceable Wear Rings
Optional, replaceable wear rings for abrasive applications improve performance and reduce maintenance costs.
Round Port Design
Round port design minimizes pressure drop and reduces turbulence.
Bleed/Drain Ports
Six, ½” NPT bleed/drain ports included as standard.
9 316SS Gate
10 Extended Flushing Ports
11 Replaceable Wear Rings
12 Round Port Design
13 Bleed/Drain Ports
Secondary Metal Seat
Secondary metal seat with shearing edge for improved reliability.
Perimeter Seat
Mechanically retained, steel reinforced perimeter seat design provides reliable bidirectional sealing.
Positive Gate Stop
Positive gate stop prevents overcompression and maximizes seat service life.
Atmospheric Seal
Secondary, the atmospheric seal ensures the process media remains contained.
14 Secondary Metal Seat
15 Perimeter Seat
16 Positive Gate Stop
17 Atmospheric Seal
Operators and Actuators
Handwheel
Handwheels are the standard operator for all knife gate valves and provide manual operation by rotating a drive nut to extend and retract the stem, which is connected to the gate with a clevis. They offer simple, dependable operation for rugged service environments.
Non-Rising Stem
A non-rising stem design is advantageous in applications with low headroom. By rotating the stem itself instead of a drive nut, the stem remains within the yoke and does not extend upwards when opening the valve. The disadvantage is that the opening/closing forces are not inline with the gate and can lead to premature wear of some components as well as increased thrust requirements.
Gear Box
Bevel gearboxes are used to manually operate large or high-torque linear valves, such as knife gate valves, with reduced input effort. They allow precise valve operation with minimal manual force allowing smooth, controlled operation even under demanding pressure conditions.
Chainwheel
Chainwheels are used to manually operate overhead or hard-to-reach valves by pulling a chain loop attached to the handwheel or gearbox. They allow valve operation from ground level, improving operator safety without the need for ladders or elevated platforms.
Pneumatic Cylinder
Pneumatic cylinders are used to actuate linear valves, such as knife gate valves, in demanding or repetitive process applications. General purpose cylinders provide reliable, consistent operation with minimal maintenance, and are typically used in the water industry and standard industrial processes.
Oversized Cylinder
An oversized cylinder (larger bore) may be utilized in applications where minimum required air pressure cannot be achieved or for applications requiring greater actuation force than normal.
Pneumatic Cylinder (Fail Close)
Fail Close pneumatic cylinders are used to actuate knife gate valves in critical slurry, wastewater, or process applications. By incorporating an internal spring, they automatically force the valve to close during an air loss event. This ensures safe, reliable valve actuation during air supply failures to protect personnel and equipment.
Pneumatic Cylinder (Fail Open)
Fail Open pneumatic cylinders are used to actuate knife gate valves in critical slurry, wastewater, or process applications. By incorporating an internal spring, they automatically force the valve to open during an air loss event. This ensures safe, reliable valve actuation during air supply failures to protect personnel and equipment.
Hydraulic Cylinder
Hydraulic cylinders are typically used to actuate large linear valves, such as knife gate valves, in high-pressure slurry or abrasive applications. Hydraulics provide a high force output from a relatively small size (compared to pneumatic cylinders) offering reliable operation and control in the toughest industrial environments.
Electric Actuator
Electric multi-turn actuators are used to operate knife gate valves in applications requiring precise, automated control or in remote environments where air or hydraulic supplies are unavailable. Electric actuation provides precise positioning, ease of integration with control systems, and lower maintenance.
Options & Accessories
Available Options
Junction Box
A junction box is typically mounted on the valve yoke and houses all the electrical connections for position sensors and solenoid valves in an approved enclosure. Installation by Elite Valve also includes armoured conduit to protect all the component wiring suitable for use in harsh environments.
V-Port
V-ports are used to create a linearized flow area as the valve opens or closes. This helps provide improved flow regulation and control stability, especially in throttling or flow control applications.
Knife Gate Valve Accessories
Position Sensors
Position sensors utilize proximity probes and a magnetic target to detect the valve position and provide reliable feedback to a control system. Mounting directly to the yoke and detecting the position of the gate provides a more reliable solution than cylinder mounted switches. Hazardous area versions are available.
Solenoid Valve
Solenoid valves are used to control the opening and closing of a pneumatically actuated valve. A NAMUR style valve is typically used for rack pinion style actuators, and an inline valve is used for pneumatic cylinders. They are available with AC or DC coil voltages and with approvals for use in hazardous areas.
Filter/Regulator
A regulator controls the air pressure used to operate a pneumatically actuated valve. Combined with an air filter and auto-drain to remove any condensation in the line, it also provides protection of downstream pneumatic components and improves system reliability.
Positioner
Positioners are used in conjunction with pneumatically actuated valves to allow variable opening and closing for flow control based on process conditions. Different types of positioners are available and including smart positioners with digital programming. Explosion proof versions are also available, as well as stainless steel enclosures for corrosive environments.
Optional Materials
Chrome Coated Gate
Chroming (hard chrome or electroplated chromium) is a metallic surface treatment applied to valve components to enhance wear resistance, reduce friction, and improve corrosion protection.
Xylan® Coated Gate/Body
Xylan® is a fluoropolymer-based coating commonly applied to valve components to enhance corrosion resistance, wear resistance, and lubrication properties.
Nedox® Coated Gate
Nedox® is a nickel-based surface treatment widely used on valve components to enhance corrosion and wear resistance when surface hardness, non-stick properties, and protection against chemical attack are required.
Boronized Gate
Boriding (Boronizing) is a thermochemical surface-hardening process that diffuses boron atoms into the surface of metal components. It significantly increases wear resistance, hardness, and corrosion resistance and is an excellent surface treatment for valves used in extreme wear and/or corrosive environments.
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