Q641Y Flanged Pneumatic Actuated Floating Metal‑Seated Ball Valve

Product Overview

Product Description

Product Name: Q641Y Ball Valve

Model Number: Q641Y-16PL DN40

Material Category: Low-Carbon Stainless Steel

Material Grade: F304L

Pressure Rating: PN16

Nominal Size: DN40

Actuation Method: Pneumatic

End Connection: Flanged

Connection Specification:Raised Face (RF) 

Design and Operation

The pneumatic actuator provides remote quarter-turn opening and closing, while the full-bore straight-through flow path is intended to reduce restriction in the open position. Actuator type, output torque, air pressure, cycle time, accessories and fail position are project selections and are not defined by the valve model alone.

Media and Service Limits

The stock record lists water, steam and oil and a maximum operating temperature of 300 C. Confirm the F304L pressure-retaining material, cemented-carbide sealing surface, stem packing and body-joint materials for the actual fluid, temperature, pressure and operating frequency.

Standards and Project Verification

The source identifies the Chinese national standard system but does not state every governing code. Confirm the design, flange, face-to-face and testing standards, along with actuator sizing, leakage criteria, material certificates and control-interface requirements before ordering.

Structural

1. Floating ball structure with Stellite hard‑faced metal‑to‑metal seat Ball floats axially. Process pressure pushes ball against downstream metal seat to realize sealing. Seat and ball sealing surface are overlaid with Stellite alloy for high‑hardness metal hard‑seal performance.

2. Flanged RF end connection Raised‑face flange ends, high connection strength, easy for field installation, disassembly and maintenance.

3. Pneumatic actuator quarter‑turn drive Equipped with pneumatic rotary actuator (double‑acting / spring‑return single‑acting optional). 90‑degree quarter‑turn on‑off action, fast opening and closing. Can match solenoid valve, limit switch, positioner for remote signal control.

4. Anti‑blow‑out stem design Anti‑blow‑out stem prevents stem ejection under internal cavity pressure. Anti‑static device is available to release static electricity generated between ball and seat.

5. High‑temperature resistant metal sealing pair Metal‑to‑metal seat assembly tolerates high working temperature, not easy to age or deform unlike PTFE soft seats. Full‑port and reduced‑port bore are optional.

6. Body cavity pressure relief feature When trapped medium inside cavity thermal‑expands and pressure rises, excess pressure can be relieved towards pipeline side to protect valve components.

Advantages

• Metal‑to‑metal Stellite hard‑seated design, suitable for high‑temperature, high‑viscosity, granular and slight abrasive media where soft‑seat cannot work.

• Floating ball structure provides reliable bi‑directional shut‑off performance.

• Pneumatic quarter‑turn actuator achieves fast remote automatic on‑off control; spring‑return version guarantees fail‑safe position upon air loss.

• Hard‑faced sealing surface features excellent wear‑resistance, anti‑scuffing property and long service life.

• Flanged connection ensures stable pipeline connection, convenient for inspection and replacement.

• Wide working temperature range, far higher temperature resistance compared with PTFE soft‑seat ball valves.

• Can be assembled with solenoid valve, limit switch and positioner to integrate into automatic industrial control system.

Standards & Typical Application

Compliance: API 6D, ASME B16.34, ASME B16.5, API 598.

Used for high‑temperature oil, heat‑conducting oil, steam, coke‑oven gas, particle‑containing medium in petrochemical, metallurgy and thermal industry.