DN100-PN25 Bellow 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

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Technical Datasheet: Bellows Seal Globe Valve

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

General Design Features

유형: 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 .
작업: Rising stem with non-rising handwheel (indicates valve position) .
흐름 방향: 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	사양
크기	DN100
압력 등급	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)
온도 범위	-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	몸	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	줄기	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.

보증:

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