DN100-PN25 Bellow Seal Globe Valve

Technical Datasheet: Bellows Seal Globe Valve

Product Name: Bellows Seal Globe Valve
Connection: Flanged Ends
公称サイズ: DN100 (4″)
Nominal Pressure: PN25
Body Construction: Cast Steel / Forged Steel

1. General Design Features

• タイプ： Bellows-sealed globe valve, straight-through pattern .
• Seal Design: Double sealing system. Primary seal is a multi-ply metal bellows welded to the stem, preventing external leakage. Secondary backup packing (graphite) provides additional safety .
• Bonnet Design: Bolted bonnet construction for easy maintenance .
• Back Seat: Standard back seat design allows for repacking under pressure (in open position) and protects the packing from system flow .
• 手術： Rising stem with non-rising handwheel (indicates valve position) .
• 流れ方向: Flow direction is typically “above the disc” (flow closes) for improved shut-off capability .

2. Applicable Standards & Specifications

3. Operating Parameters

4. Bill of Materials (Typical Material Selection)

Note: Material selection depends on the fluid temperature and corrosivity. Two common configurations are listed below.

5. Dimensional Data (DN100 PN25)

Note: Dimensions are standard references per DIN/EN standards. Verify with manufacturer’s drawing.

6. Inspection & Testing Procedure

• Shell Test: Valve partially open. Hydrostatic test at 1.5 times PN (38 bar) . Check body and bonnet joints for leaks .
• Seat Test: Valve closed. Hydrostatic test at 1.1 times PN (27.5 bar) . Check for leakage across the seat.
• Bellows Seal Test: Specific test to ensure the bellows integrity (usually with air or helium leak detection).
• Backseat Test: Verify backseat seal function when valve is fully open.

7. Features & Benefits

• Zero Leakage: The welded metal bellows eliminates stem leakage, reducing maintenance and improving safety for toxic or expensive media .
• Extended Service Life: Bellows compensates for thermal expansion and has high cycle life.
• Energy Savings: Prevents loss of valuable fluids or steam.
• Maintenance Friendly: Backup packing allows for sealing even in the unlikely event of bellows failure .
• ISO 5211 Mounting: Top flange (if specified) allows for easy mounting of actuators.

保証:

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