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Frequently asked questions
Clear answers to common questions.
Understand the operating principles, selection considerations and information needed for a technical review.
What was the original idea behind Model Y?
Integrate two solid metal plates, each equivalent to an isolation blind, into a single valve body. The goal was to make blind insertion and withdrawal as convenient as operating a valve. The design also serves conventional isolation duties, functionally combining two rising-stem ball valves in one body.
Can Model Y replace a standard ball valve?
Model Y uses API 6D standard ball-valve face-to-face dimensions. With matching size, pressure class, end connections and face-to-face length, it can replace a standard ball valve without changing the piping installation length. Materials, service conditions and actuation requirements are reviewed during selection.
How does the Model Y valve operate?
The two solid metal plates retract from the stationary seats before the ball rotates to open the full-bore flow path. During closing, the ball rotates first, then the mechanism presses the plates against the seats. Separating plate movement from ball rotation keeps the sealing surfaces clear during rotation.
Does the valve rely on line pressure to seal?
The mechanism applies sealing force directly. The required sealing performance, pressure range, temperature range and materials must still be confirmed for the selected configuration.
Are the two sealing elements independently operated?
No. They are linked through a common operating mechanism. Where the selected configuration permits separate seal verification, this should not be confused with independent actuation.
Can Model Y be used for DBB or DIB duties?
These arrangements can be considered during selection. The required barrier arrangement, venting and verification procedure should be defined with the customer and confirmed for the specific valve configuration.
Is every Model Y configuration suitable for pigging?
A full-bore passage supports pigging in suitable configurations. Confirm the actual bore, geometry, end connections and pig requirements before specifying the valve.
Will MTE fit our existing flange?
Compatibility depends on the bolt pattern, fastener dimensions, clearance and tightening requirement. Send the flange drawing and application details so the proposed setup can be reviewed.
Does MTE guarantee a leak-free joint?
No tightening tool alone can guarantee joint integrity. Gasket selection, flange condition, fastener properties, lubrication, assembly procedure and verification all affect the result.
Where can I find drawings, test information or a quotation?
Use the Resources page to identify the information you need, then contact BridgeFlow with your service conditions or flange details. Documentation and commercial proposals are prepared for the relevant configuration.
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Share your service conditions and isolation or tightening requirements.