Ball Valve 3 Pieces - UNIFLOW Fig. BV3MD | Comeval

Comeval UNIFLOW Fig. BV3MD Three-Piece Ball Valve

The Comeval UNIFLOW Fig. BV3MD is a three-piece, split-body, floating-ball valve manufactured in ASTM A351 CF8M stainless steel. The BV3MD version uses a direct-mounting top arrangement for installation with a manual lever, gearbox, pneumatic actuator, or electric actuator.

Construction

• Body material: investment-cast stainless steel ASTM A351 CF8M
• Valve type: floating ball, three-piece body
• Seat material: PTFE as standard
• End connections: BSP / ISO 228-1 threaded
• Design standard reference: DIN configuration
• Pressure class: PN 63, subject to temperature and seat derating
• Size range: DN8 to DN100
• Flow direction: bidirectional shut-off service

Typical Applications and Media

This valve is used for isolation duties in utility and process pipework where stainless steel body material and PTFE soft seats are compatible with the fluid and operating temperature.

• Water and treated water systems
• HVAC chilled-water and heating-water circuits
• Compressed air and inert gas lines
• Lubrication and light oil services
• General industrial process lines
• Non-slurry fluids where soft-seat sealing is acceptable

Operating and Selection Notes

• Verify CF8M and PTFE compatibility against the actual fluid, concentration, temperature, and cleaning regime.
• PTFE seats provide tight shut-off but are not intended for abrasive solids or severe throttling.
• Pressure rating PN 63 applies at reference conditions; allowable pressure reduces as temperature increases.
• For automated service, confirm valve torque with the selected actuator, including breakaway torque and safety factor.

Automation and Actuator Options

The direct-mounting design reduces the need for separate brackets and couplings. It is suitable for quarter-turn automation using pneumatic rack-and-pinion actuators, electric actuators, or gear operators where manual force must be reduced.

Maintenance Considerations

The three-piece body allows access to the center section for inspection of the seats, ball, body seals, and stem packing without full removal of the adjacent pipework. Maintenance planning should include leakage checks at the stem seal and body joints after commissioning and thermal cycling.

Variant Comparison

• BV3MD: direct-mount top for actuator or lever installation.
• Standard manual configuration: suitable where remote operation or automated control is not required.
• Seat variants: PTFE is the referenced standard; alternative sealing materials must be selected according to temperature, pressure, and chemical compatibility.

Standards and Documentation

Relevant project documentation may include ISO 228-1 threaded connection verification, material certificates such as EN 10204 where specified, pressure test records, and actuator sizing data. CE, ATEX, or other approvals should be confirmed against the exact valve configuration and service conditions.

FAQ

• Is the valve suitable for throttling? It is primarily an isolation valve. Continuous throttling can damage PTFE seats and increase leakage risk.
• Can it be automated? Yes. The BV3MD direct-mount arrangement supports pneumatic or electric quarter-turn actuators.
• Is it suitable for steam? Steam use requires confirmation of seat temperature limits, pressure derating, and leakage class requirements.