Control Seal - Double Block and Bleed Valves for Isolation and Bleeding Applications

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The Control Seal Double Block and Bleed Valve (DBBV) is engineered to deliver frictionless, reliable sealing solutions across diverse industrial applications, including metering, tank farms, airports, and pipelines. This valve's design addresses common issues found in traditional valve systems by eliminating friction during operation and requiring no maintenance. Supporting a wide range of pressures (150# ~ 2500#) and temperatures (-196°C ~ 250°C), it accommodates reduced or full bore configurations, with customizable materials and connections. The innovative dual expanding plug mechanism provides 100% bubble-tight sealing independent of line pressure, ensuring that downstream and upstream isolation and bleed functions are efficiently managed. A thermal relief system helps to vent overpressure without compromising pressure balance. The valves are compliant with strict testing standards like API 6D, ISO 10497, and have been fire-safe certified. Easy slip replacement reduces downtime, and the self-locking operating mechanism prevents unintentional closures.

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Control Seal Double Block and Bleed dual expanding Plug Valves (DBBV) respond to the market demand for a non friction Double tight shut-off valve. Reduced space and no maintenance requirements are met. Control Seal DBBV provides 100% bubble tight sealing both up and down stream and is achieved mechanically - independent on line pressure.

SIZE: 1” ~ 48” (DN25 ~ DN1200) (up to unlimited based on approvals)

BORE: Reduced or Full (Full is piggable)

PRESSURE: 150# ~ 2500# (PN20 ~ PN420)

TEMPERATURE RANGE: -196°C ~ 250°C

CONNECTIONS: Wide choice on request

MATERIALS: Wide choice on request

DBBV is a single valve solution used as replacement of two in-line valves with a drain and/or bleed valve. Many different valve type have been used in double configuration for blocking and bleeding, sampling or draining. Traditional solutions can result in loss of product, frequent maintenance and even failure.

DBBV has two seated surfaces (slips). When the valve is in closed position each individual seal is fully isolating, not allowing any leakage from downstream, upstream nor from the body cavity. A thermal relief vents / bleeds the body cavity when overpressure occurs so the downstream pipeline is fully isolated from upstream pressure without necessity for pressure balancing.

Compared to other types of DBB valves, Double Block and Bleed plug Valve has the DIB - Double Isolation and Bleed function and therefore it provides double security due to two seals that are independent on each other.

The following BENEFITS arise from using SINGLE VALVE SOLUTION:

SPACE + WEIGHT REQUIREMENT REDUCTION

SHORTER DRAIN TIMES

ONE ACTUATOR INSTEAD OF TWO

CHARACTERISTICS

100% TIGHT SHUT OFF, therefore zero leakage. Provable by bleed system.

MECHANICALLY ENERGIZED SEALING without springs or other weak parts required to obtain sealing.

FRICTION-FREE OPENING AND CLOSING, no contact between slip seals and seating area during rotation.

NON LUBRICATED SEALING, media specific soft seal material.

DUAL EXPANDING, proven zero leakage both up and downstream.

THE SELF-LOCKING OPERATING MECHANISM on all Control Seal valves secures the closing member from rotating due to in-line forces. As a result there is no danger of line slam or shock.

APPLICATIONS

Metering skids

Tank farms

Airports

Pipelines

Manifolds

Filling lines

Control Seal has a UNIQUE DESIGN OF ITS PRODUCTS, SHORT LEAD TIME, COMPETITIVE PRICING AND EXCELLENT AFTER-SALES SUPPORT.

Control Seal has delivered the world's largest non contact Double Block and Bleed dual expanding Plug Valves - sizes 42" and 48". Full bore execution is possible for large sizes with Control Seal.

Main competitive advantage of Control Seal design is its unique invention - HELIXTRUNNION® rotating mechanism, see benefits of the design below:

SMALLER ENVELOPE due to no stem guiding groove, no stem guides as in conventional design and trunnion placed inside the valve body reducing lower plate size.

FAST OPENING AND CLOSING due to a very strong rotating mechanism.

The valve is MAINTENANCE FRIENDLY as the rotating mechanism is inside the valve. Furthermore, stemguides and gland packings are outside pressurized area and can be adjusted while the valve is in service. All valves are executed with a back seat.

Less moving parts lead to LONG LIFE AND LESS SPARE PARTS NEEDED. No stem guiding groove and stem guides as in conventional design. NO NEED OF LUBRICATION of the stem guides.

Control Seal valves have been FIRE SAFE tested by independent laboratories and have passed BS 6755 part 2, API 6FA and ISO 10497 third party wittnessed tests succesfully.

In case of system contamination resulting in the soft seals damage, it is possible to replace slips with soft seals easily by bottom or top entry while the valve is in-line and therefore REDUCE DOWNTIME of the unit/plant to minimum. No special tools are required.

All Control Seal valves are delivered with sealing specifically chosen for customer application and media in cooperation with leading experts in the field.

BLEED SYSTEMS

The functions of the bleed system: Proving tight shut off; Pressure relief inside the body cavity

The following options are available (and more on request):