Technical Datasheet: Bellows Seal Globe Valve
Product Name: Bellows Seal Globe Valve
Connection: Flanged Ends
الحجم الاسمي: DN100 (4″)
Nominal Pressure: بي إن 25
Body Construction: Cast Steel / Forged Steel
- General Design Features
- يكتب: 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 .
- عملية: Rising stem with non-rising handwheel (indicates valve position) .
- اتجاه التدفق: 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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مواصفة
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مقاس
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DN100
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تصنيف الضغط
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بي إن 25 *(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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نطاق درجة الحرارة
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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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جسم
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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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ينبع
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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.
ضمان:
تلتزم شركة سافي فالفز بتقديم منتجات عالية الجودة وخدمة ما بعد البيع مريحة. نضمن لصماماتنا عمر خدمة لا يقل عن ١٢ شهرًا، نوفر خلالها جميع قطع الغيار اللازمة وتعليمات الصيانة المفصلة مجانًا. خلال فترة الضمان، في حال حدوث أي ضرر غير بشري، نستبدل المكونات مجانًا ونقدم دعمًا فنيًا احترافيًا. بعد انتهاء الضمان، يدفع العميل فقط تكلفة قطع الغيار، مع الاستفادة من خدمات الصيانة المخفضة. هدفنا هو مساعدة عملائنا على خفض تكاليف التشغيل وتحسين كفاءة الإنتاج من خلال جودة موثوقة ودعم شامل لما بعد البيع. سواءً للاستفسارات الفنية أو احتياجات الصيانة، سيستجيب فريق خبرائنا على الفور لضمان الحفاظ على الأداء الأمثل لنظام صماماتك في جميع الأوقات.