Technical Datasheet: Bellows Seal Globe Valve
Product Name: Bellows Seal Globe Valve
Connection: Flanged Ends
Tamanho nominal: DN100 (4″)
Nominal Pressure: PN25
Body Construction: Cast Steel / Forged Steel
- General Design Features
- Tipo: 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 .
- Operação: Rising stem with non-rising handwheel (indicates valve position) .
- Direção do fluxo: Flow direction is typically “above the disc” (flow closes) for improved shut-off capability .
- Applicable Standards & Specifications
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Item
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Standard / Specification
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Design & Manufacturing
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DIN 3356, EN 137-1, GB/T 12235, ASME B16.34 (applicable)
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Face-to-Face Dimensions
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DIN 3202 / EN 558-1 Series 1
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Flange Connection
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DIN 2543-2456 / EN 1092-1 (PN25)
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Pressure-Temperature Rating
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DIN 2401 / ASME B16.34
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Testing & Inspection
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DIN 3230 / EN 12266-1
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Bellows Standard
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ISO 15761 / BS EN 137-1
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- Operating Parameters
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Item
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Especificação
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Tamanho
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DN100
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Classificação de pressão
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PN25 *(approx. 25 bar / 2.5 MPa / 363 PSI)*
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Shell Test Pressure
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38 bar (Hydrostatic, 1.5 x PN)
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Seat Test Pressure
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27.5 bar (Hydrostatic, 1.1 x PN)
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Faixa de temperatura
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-10°C to +400°C (depending on body and bellows material)
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Suitable Media
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Steam, thermal oil, hot water, aggressive and hazardous fluids
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Leakage Rate
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Zero leakage to atmosphere (bellows seal)
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- Bill of Materials (Typical Material Selection)
Note: Material selection depends on the fluid temperature and corrosivity. Two common configurations are listed below.
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Item
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Part Name
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Carbon Steel Configuration
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Stainless Steel Configuration
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1
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Corpo
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GS-C25 / A216 WCB (Carbon Steel Casting)
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1.4408 / A351 CF8M (SS Casting)
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2
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Bonnet / Yoke
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GS-C25 / A216 WCB
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1.4408 / A351 CF8M
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3
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Disc / Valve Plug
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20Cr13 + Stellite (Hardfaced)
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SS316 + Stellite
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4
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Seat Ring
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13Cr / A105 + Stellite
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SS316 + Stellite
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5
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Bellows
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AISI 304 / 316 (Stainless Steel)
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AISI 316L / C276 (Hastelloy)
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6
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Tronco
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AISI 420 / 20Cr13 (Stainless Steel)
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AISI 316 / 1.4401
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7
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Gasket (Body/Bonnet)
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Spiral Wound (Graphite + SS304)
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Spiral Wound (Graphite + SS316)
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8
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Packing (Backup)
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Graphite Rings
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Graphite Rings
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9
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Studs & Nuts
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ASTM A193 B7 / A194 2H
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ASTM A193 B8 / A194 8
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10
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Handwheel
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Ductile Iron / Fabricated Steel
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Ductile Iron / SS
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- Dimensional Data (DN100 PN25)
Note: Dimensions are standard references per DIN/EN standards. Verify with manufacturer’s drawing.
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Dimension
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Value (mm)
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Notes / Reference Standard
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Face-to-Face Length (L)
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350 mm
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DIN 3202 / EN 558-1 Series 1 (approx.)
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Overall Height (H)
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350 – 381 mm
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Handwheel closed position (approx.)
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Flange Diameter (D)
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235 mm
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DIN EN 1092-1 (PN25)
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Bolt Circle Diameter (K)
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190 mm
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Standard for DN100 PN25
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Number of Bolt Holes
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8
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Standard for DN100 PN25
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Bolt Hole Diameter (L)
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22 mm
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Standard for M20 bolts
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Weight
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35 kg – 48 kg
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Depends on material (CS vs SS) and pressure rating
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- 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.
GARANTIA:
A SAVVY VALVES está comprometida em oferecer produtos de qualidade excepcional e um serviço pós-venda sem preocupações. Nossas válvulas têm garantia de vida útil mínima de 12 meses, durante a qual forneceremos gratuitamente todas as peças de reposição necessárias e instruções detalhadas de manutenção. Dentro do período de garantia, caso ocorra algum dano não causado por intervenção humana, substituiremos os componentes gratuitamente e forneceremos suporte técnico profissional. Após o término da garantia, os clientes pagam apenas o custo das peças de reposição, continuando a se beneficiar de serviços de manutenção com desconto. Nosso objetivo é ajudar os clientes a reduzir custos operacionais e aumentar a eficiência da produção por meio de qualidade confiável e suporte pós-venda abrangente. Seja para consultas técnicas ou necessidades de manutenção, nossa equipe de especialistas responderá prontamente para garantir que seu sistema de válvulas mantenha o desempenho ideal o tempo todo.