Technical Datasheet: Bellows Seal Globe Valve
Product Name: Bellows Seal Globe Valve
Connection: Flanged Ends
Nenngröße: DN100 (4″)
Nominal Pressure: PN25
Body Construction: Cast Steel / Forged Steel
- General Design Features
- Typ: 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 .
- Betrieb: Rising stem with non-rising handwheel (indicates valve position) .
- Fließrichtung: Flow direction is typically “above the disc” (flow closes) for improved shut-off capability .
- Applicable Standards & Specifications
|
Item
|
Standard / Specification
|
|
Design & Manufacturing
|
DIN 3356, EN 137-1, GB/T 12235, ASME B16.34 (applicable)
|
|
Face-to-Face Dimensions
|
DIN 3202 / EN 558-1 Series 1
|
|
Flange Connection
|
DIN 2543-2456 / EN 1092-1 (PN25)
|
|
Pressure-Temperature Rating
|
DIN 2401 / ASME B16.34
|
|
Testing & Inspection
|
DIN 3230 / EN 12266-1
|
|
Bellows Standard
|
ISO 15761 / BS EN 137-1
|
- Operating Parameters
|
Item
|
Spezifikation
|
|
Größe
|
DN100
|
|
Druckbewertung
|
PN25 *(approx. 25 bar / 2.5 MPa / 363 PSI)*
|
|
Shell Test Pressure
|
38 bar (Hydrostatic, 1.5 x PN)
|
|
Seat Test Pressure
|
27.5 bar (Hydrostatic, 1.1 x PN)
|
|
Temperaturbereich
|
-10°C to +400°C (depending on body and bellows material)
|
|
Suitable Media
|
Steam, thermal oil, hot water, aggressive and hazardous fluids
|
|
Leakage Rate
|
Zero leakage to atmosphere (bellows seal)
|
- Bill of Materials (Typical Material Selection)
Note: Material selection depends on the fluid temperature and corrosivity. Two common configurations are listed below.
|
Item
|
Part Name
|
Carbon Steel Configuration
|
Stainless Steel Configuration
|
|
1
|
Körper
|
GS-C25 / A216 WCB (Carbon Steel Casting)
|
1.4408 / A351 CF8M (SS Casting)
|
|
2
|
Bonnet / Yoke
|
GS-C25 / A216 WCB
|
1.4408 / A351 CF8M
|
|
3
|
Disc / Valve Plug
|
20Cr13 + Stellite (Hardfaced)
|
SS316 + Stellite
|
|
4
|
Seat Ring
|
13Cr / A105 + Stellite
|
SS316 + Stellite
|
|
5
|
Bellows
|
AISI 304 / 316 (Stainless Steel)
|
AISI 316L / C276 (Hastelloy)
|
|
6
|
Stängel
|
AISI 420 / 20Cr13 (Stainless Steel)
|
AISI 316 / 1.4401
|
|
7
|
Gasket (Body/Bonnet)
|
Spiral Wound (Graphite + SS304)
|
Spiral Wound (Graphite + SS316)
|
|
8
|
Packing (Backup)
|
Graphite Rings
|
Graphite Rings
|
|
9
|
Studs & Nuts
|
ASTM A193 B7 / A194 2H
|
ASTM A193 B8 / A194 8
|
|
10
|
Handwheel
|
Ductile Iron / Fabricated Steel
|
Ductile Iron / SS
|
- Dimensional Data (DN100 PN25)
Note: Dimensions are standard references per DIN/EN standards. Verify with manufacturer’s drawing.
|
Dimension
|
Value (mm)
|
Notes / Reference Standard
|
|
Face-to-Face Length (L)
|
350 mm
|
DIN 3202 / EN 558-1 Series 1 (approx.)
|
|
Overall Height (H)
|
350 – 381 mm
|
Handwheel closed position (approx.)
|
|
Flange Diameter (D)
|
235 mm
|
DIN EN 1092-1 (PN25)
|
|
Bolt Circle Diameter (K)
|
190 mm
|
Standard for DN100 PN25
|
|
Number of Bolt Holes
|
8
|
Standard for DN100 PN25
|
|
Bolt Hole Diameter (L)
|
22 mm
|
Standard for M20 bolts
|
|
Weight
|
35 kg – 48 kg
|
Depends on material (CS vs SS) and pressure rating
|
- 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.
- 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.
GARANTIE:
SAVVY VALVES steht für herausragende Produktqualität und einen sorgenfreien Kundendienst. Unsere Ventile haben eine garantierte Mindestlebensdauer von 12 Monaten. Innerhalb dieser Zeit liefern wir Ihnen kostenlos alle notwendigen Ersatzteile und detaillierte Wartungsanleitungen. Bei nicht menschlich verursachten Schäden innerhalb der Garantiezeit ersetzen wir Komponenten kostenlos und bieten professionellen technischen Support. Nach Ablauf der Garantie zahlen Sie lediglich die Kosten für Ersatzteile und profitieren weiterhin von vergünstigten Wartungsleistungen. Unser Ziel ist es, Kunden durch zuverlässige Qualität und umfassenden Kundendienst dabei zu unterstützen, Betriebskosten zu senken und die Produktionseffizienz zu steigern. Ob technische Anfragen oder Wartungsbedarf – unser Expertenteam reagiert umgehend, um sicherzustellen, dass Ihr Ventilsystem jederzeit optimal funktioniert.