Q347Y-16/25C Large Diameter Metal Hard Seal Fixed Ball Valve

The Q347Y-16/25C large-diameter metal hard-seal fixed ball valve is a new generation of high-performance ball valve, suitable for long-distance pipelines and general industrial pipelines. Its strength, safety, and resistance to harsh environments have been specially considered in its design, making it suitable for various corrosive and non-corrosive media. Compared to floating ball valves, during operation, the force generated by the upstream fluid pressure on the ball is entirely transferred to the bearing, preventing the ball from moving towards the valve seat. Therefore, the valve seat deformation is small, the sealing performance is stable, and the service life is long, making it suitable for high-pressure, large-diameter applications. An advanced spring-loaded pre-seat assembly has self-tightening characteristics, achieving upstream sealing. Each valve has two seats, sealing in both directions, thus eliminating flow direction restrictions and allowing for bidirectional operation. This valve is available in two-piece and three-piece body structures. The middle flange is bolted together, and the seal uses reinforced PTFE embedded in a stainless steel ring. A spring at the rear of the steel ring ensures the valve seat remains tightly against the ball, maintaining a seal. Both upper and lower valve stems are equipped with PTFE bearings to reduce friction and simplify operation. The small shaft has no adjusting slab at the bottom, ensuring proper contact between the ball and the sealing ring. The full-bore structure ensures that the valve flow orifice matches the pipeline inner diameter, facilitating pipeline cleaning.

Product Name: Large Diameter Metal Hard Seal Fixed Ball Valve

Product Model: Q347Y-16/25C

Nominale diameter: DN150～DN1200

Structure: Fixed Ball

Nominal Pressure: 1.6Mpa～42.0Mpa

Connection Method: Flens

Applicable Temperature: -29～450℃

Actuation Method: Manual, Worm Gear, Electric, Pneumatic

Valve Body Material: A105 Forged Steel, WCB Cast Steel, Roestvrij staal 304, 316

Manufacturing Standard: GB (Chinese National Standard), DIN (German Standard), API (American Standard), ANSI (American Standard)

Applicable Media: Water, Oil, Gas, and Certain Corrosive Liquids

Manufacturer: Zhejiang Kozo Valve Co., Ltd.

Q347Y-16/25C Large Diameter Metal Hard Seal Fixed Ball Valve Product Features

1. Structural Features: The Q347Y-16/25C large-diameter metal hard-seal fixed ball valve is a ball valve with a fixed shaft, also known as a fixed ball valve. Fixed ball valves are mainly used for high-pressure, large-diameter applications. Depending on the installation of the valve seat seal ring, fixed ball valves can have two structures: a valve seat with a front seal on the ball and a valve seat with a rear seal on the ball.

2. Integral Structure: Features full-channel operation, emergency sealing, and fire resistance.

3. Full Bore: The valve flow passage diameter matches the pipe’s inner diameter, facilitating pipeline cleaning.

4. Blockage and Drainage: When the valve is closed, the upstream and downstream valve seats block the fluid flow, allowing accumulated material in the valve body cavity to drain. The drainage device has the following functions:

① Pre-checks for valve seat leakage or damage;

② Reduces valve contamination during media changes;

③ Allows replacement of the valve stem packing gland when the valve is fully open or fully closed under operating pressure. (As shown in Figure 5, the drain device is a drain plug.)

5. Automatic Pressure Relief: When the medium stagnating in the valve cavity experiences an abnormal temperature rise due to increased temperature, the safety valve installed on the valve seat or valve body can automatically relieve pressure.

6. Fireproof Structure: Utilizing a double seal, in the event of a fire, after the non-metallic valve seat is burned, the medium presses the sphere against the metal sealing surface on the valve body, preventing large-scale leakage, conforming to API 607 standards.

7. Emergency Sealing: When leakage occurs due to damage to the valve seat and valve stem seals, injecting sealing grease through the grease injection valve can provide an instantaneous emergency seal.

8. Extended Valve Stem: An extended valve stem is suitable for underground installations and cryogenic media. The extended dimension is determined according to requirements. Operating methods include manual, pneumatisch, elektrisch, pneumatic-hydraulic linkage, and hydraulic operation.