DN100-PN25 Bellow Seal Globe Valve

Technical Datasheet: Bellows Seal Globe Valve

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

1. General Design Features

• Type: 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 .
• Operation: Rising stem with non-rising handwheel (indicates valve position) .
• Flow Direction: 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.

GUATANTEE:

SAVVY VALVES is committed to delivering exceptional product quality and worry-free after-sales service. Our valves are guaranteed to provide a minimum service life of 12 months, during which we will supply all necessary spare parts and detailed maintenance instructions free of charge. Within the warranty period, if any non-human-induced damage occurs, we will replace components at no cost and provide professional technical support. After the warranty expires, customers only need to pay for the cost of spare parts, while still benefiting from discounted maintenance services. Our goal is to help clients reduce operational costs and enhance production efficiency through reliable quality and comprehensive after-sales support. Whether for technical inquiries or maintenance needs, our expert team will respond promptly to ensure your valve system maintains optimal performance at all times.