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Mechanized Ball Valve

Blind-plate isolation. Valve-like operation.

The BridgeFlow Model Y integrates two solid metal plates, each designed to serve as the equivalent of a blind plate, within a single valve body. The original goal: make inserting and withdrawing isolation blinds as convenient as operating a valve.

Two solid barriers. One valve body.

Conventional blind insertion and removal is a separate maintenance task. Model Y brings that function inside the valve: two solid metal plates move into position and are mechanically pressed against the stationary seats to seal the flow path.

To open, the plates retract from the seats before the ball rotates, keeping the sealing surfaces clear during rotation. To close, the ball rotates first, then the plates engage to establish mechanically forced sealing.

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Animation of the BridgeFlow mechanized ball valve opening and closing
Model Y operating sequence. Illustrative animation.

Design philosophy

From blind isolation to everyday shutoff.

Integrated blind plates

Two solid metal plates provide the physical barriers at the heart of the design, bringing blind-plate isolation into a valve-operated assembly.

Two valves in one

The same design also serves conventional isolation duties, functionally combining two rising-stem ball valves in one body. Both sealing plates are driven by a common operating mechanism.

A standard installation length

API 6D standard ball-valve face-to-face dimensions allow direct replacement of a standard ball valve with matching size, pressure class, end connections and face-to-face length, without changing the piping installation length.

Operating principle

Retract. Rotate. Seal.

01 / Release the seals

The mechanism retracts both solid metal plates from the stationary seats before rotation begins.

02 / Open the flow path

The ball rotates to align the full-bore passage with the pipeline. Pigging suitability depends on the selected configuration.

03 / Close and engage

After the ball reaches the closed position, the mechanism presses both solid metal plates against the stationary seats to seal the flow path.

Designed around the isolation task.

Match the valve configuration to the process, verification procedure and operating requirements.

Mechanically forced sealing

The closing mechanism applies sealing force directly. Materials, seat design and test criteria are selected for the intended service.

Seal verification

Suitable configurations support double block and bleed or double isolation and bleed arrangements. Confirm the required arrangement and verification method during selection.

Compact operation

A non-rising stem and integrated mechanism help reduce installation space. Manual, pneumatic and electric actuation can be considered for the application.

Full-bore flow

An unobstructed passage in the open position supports low-resistance flow and can accommodate pigging when the complete valve configuration is suitable.

The sealing elements are operated through a common mechanism. Separate seal verification does not mean independent actuation. Isolation, venting and maintenance must follow the approved site procedure.

Core application strengths

Emergency duty starts long before the trip.

Blowdown valves must remain sealed while closed. Shutdown valves must move reliably after long periods open. Model Y addresses both duties through solid metal barriers and friction-free ball rotation.

Normally closed → Open on demand

Emergency blowdown

A blowdown valve may remain closed for most of its service life, opening only when emergency depressurization is required. Its everyday job is therefore sustained isolation, followed by dependable opening on demand.

Model Y integrates two solid metal plates designed to provide blind-plate-level sealing. Mechanically forced engagement holds the barriers against stationary seats; the plates retract before the ball rotates open. This combines the sealing objective of a blind plate with the operating convenience of a valve.

Application value

Long-duration closed-state isolation, followed by controlled opening to the designated blowdown or flare system.

Normally open → Close on demand

Emergency shutdown (ESD)

An ESD valve may remain fully open for an extended period before it must close. In designs where the ball rotates against loaded seats, seat friction and lubricant condition can affect breakaway and operating torque after a long idle period.

Model Y keeps the sealing surfaces clear during ball rotation. This removes ball-to-seat rubbing from the rotational stroke, addressing that source of friction-related torque rise. Once the ball reaches the closed position, the mechanism engages both solid metal plates to establish blind-plate-level sealing.

Application value

Friction-free ball rotation for the closing stroke, followed by mechanically forced sealing for sustained isolation.

BridgeFlow internal comparative testing

Six months of pressure-holding comparison.

BridgeFlow has conducted comparative sealing tests between its valve and a blind plate, including a six-month pressure-holding test. BridgeFlow reports that its valve delivered better sealing performance than the blind-plate comparator under the tested conditions.

This is a manufacturer-reported result for the tested configuration. Contact BridgeFlow to discuss the test conditions, comparison method and relevance to your duty.

For either emergency duty, the complete valve and actuator package is matched to the required response time, fail position, available power, process differential pressure and system verification requirements.

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Application review

Start with the duty.

Typical areas for evaluation include tank farms, metering and loading systems, multi-product manifolds, process-unit isolation, and pump or compressor stations.

Share line size, pressure and temperature range, fluid composition, operating frequency, end connections and actuation needs. BridgeFlow can then review materials, sealing configuration and the required documentation.

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Let’s review your application.

Share your service conditions and isolation or tightening requirements.

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