2″-300LB SS Bellow Seal Gate Valve

Size 2 inches (DN 50)
Pressure Class Class 300 LB (PN 50)
Body Material Stainless Steel (ASTM A182 F304 / F316 / F316L)
Manufacturing Process Forged / Cast (depending on manufacturer)
Design Standard API 602 / ASME B16.34
End Connection Standard ASME B16.5 (Flanged RF/RTJ), ASME B16.25 (BW), ASME B16.11 (SW)
Face to Face Standard ASME B16.10
Test & Inspection Std. API 598
Emission Compliance ISO 15848-1 / TA-Luft (optional)

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TECHNICAL DATA SHEET

Product Name: 2-inch 300LB Stainless Steel Bellows Seal Gate Valve
Model/Specification: 2″-300LB-SS-Bellow
밸브 유형: Gate Valve (Bellows Sealed)
Connection Type: Flanged (RF) / Butt Weld (BW) / Socket Weld (SW) User specified

Basic Design Parameters

매개변수	Standard/Specification
크기	2 inches (DN 50)
Pressure Class	Class 300 LB (PN 50)
본체 재질	Stainless Steel (ASTM A182 F304 / F316 / F316L)
Manufacturing Process	Forged / Cast (depending on manufacturer)
Design Standard	API 602 / ASME B16.34
End Connection Standard	ASME B16.5 (Flanged RF/RTJ), ASME B16.25 (BW), ASME B16.11 (SW)
Face to Face Standard	ASME B16.10
Test & Inspection Std.	API 598
Emission Compliance	ISO 15848-1 / TA-Luft (optional)

Technical Specifications

매개변수	Details
Bonnet Type	Bolted Bonnet with Bellows Seal Assembly
Stem Type	Outside Screw and Yoke (OS&Y), Rising Stem
Gate Type	Flexible Wedge / Solid Wedge
Sealing Principle	Double seal: Primary Bellows Seal + Secondary Gland Packing
Bellows Material	Stainless Steel (SS304, SS316L) / Inconel 625
Applicable Media	Steam, Toxic/Hazardous Fluids, Heat Transfer Oil, Corrosive Media
온도 범위	-29°C to 595°C (depending on trim)
작업	Handwheel / Gear Operated / Electric Actuator

Material of Construction (Recommended – Stainless Steel)

Part Name	재료	Standard/Grade
몸	Forged Stainless Steel	ASTM A182 F316 / F316L
Bonnet	Forged Stainless Steel	ASTM A182 F316 / F316L
Gate / Wedge	Stainless Steel + Hardfacing	A182 F316 + Stellite (optional)
Seat Ring	Stainless Steel + Hardfacing	A182 F316 + Stellite / Integral
줄기	Stainless Steel	ASTM A182 F316 (ground and polished)
Bellows	Stainless Steel	SS304, SS316L, or Inconel 625
Bonnet Gasket	Spiral Wound	Graphite + 304SS
Packing (Backup)	Flexible Graphite / PTFE	Low Sulfur, High Temp
Stem Nut	Aluminum Bronze	ZQA19-4 / C95400
Studs/Nuts	Stainless / Alloy Steel	ASTM A193 B8 / A194 8
Handwheel	Ductile Iron / Carbon Steel	ASTM A536 / A216 WCB

Main Dimensions & Connection Details

Note: Dimensions are for Flanged Ends (RF) according to ASME B16.10 and ASME B16.5. BW end length may vary.

4.1 End-to-End Dimensions (Face-to-Face)

크기	Class	L (RF) mm	H (Closed) mm	W (Handwheel) mm	Weight (approx. kg)
2″	300LB	216	~ 370	220	~ 38

4.2 Flange Details (Per ASME B16.5 – Class 300)

Flange Diameter (OD): 165 mm (6.5 in)
Bolt Circle Diameter: 127 mm (5.0 in)
Number of Bolt Holes: 8
Bolt Hole Size: 3/4 in (19 mm)
Hub Diameter: 92 mm (3.62 in)
Raised Face Height: 2 mm (0.06 in)

4.3 Weld End Preparation (if BW – per ASME B16.25)

Bevel Angle: 37.5° (±2.5°)
Root Face: 1.6 mm (1/16″) nominal
Counterbore: To match pipe schedule (e.g., Sch. 40, Sch. 80) as specified.

Pressure-Temperature Rating (ASME B16.34)

*Material Group: 2.1 / 2.2 (Stainless Steel – A182 F304/F316)*

Temperature (°C)	Working Pressure (MPa)	Working Pressure (psig)
-29 to 38	5.10	740
100	4.80	695
200	4.35	630
250	4.14	600
300	3.95	575
400	3.70	535
500	3.20	465

Note: Actual rating depends on specific grade (CF8, CF8M, F304, F316). Consult manufacturer for exact values above 400°C.

Test Pressure (API 598)

Test Type	Medium	Pressure (MPa)	Pressure (psig)	Note
Shell Test	Water	7.65	1,110	1.5 x 38°C Rating
High-Pressure Seat Test	Water	5.61	815	1.1 x 38°C Rating
Low-Pressure Seat Test	Air/N2	0.5 – 0.7	70 – 100	Optional
Bellows Leak Test	Helium	< 1 x 10⁻⁶ mbar·L/s	—	Optional (for fugitive emission compliance)

Features & Applications

Key Features:

Zero Leakage (Hermetic Seal): The multi-ply stainless steel bellows is welded to the stem and bonnet, creating a metal barrier that prevents fugitive emissions and ensures environmental safety.
Double Seal Safety: Incorporates a secondary graphite packing as a backup in case of bellows failure, ensuring operational integrity.
Maintenance-Free Stem: Eliminates the need for frequent packing adjustments or replacements, reducing downtime.
Long Cycle Life: Bellows design accommodates thousands of open/close cycles without fatigue (up to 10,000+ cycles).
Corrosion Resistance: Full stainless steel construction (body, bonnet, bellows) provides excellent resistance to corrosive media.
Backseat Design: Protects the bellows and packing from system pressure when the valve is fully open.
OS&Y Design: Provides visual indication of valve position.

Main Applications:

Petrochemical & Refinery Plants (handling hydrocarbons, H₂S)
Thermal Oil Systems & Heat Transfer Fluids
Steam Systems (Power Generation)
Chemical Processing (corrosive/toxic fluids)
Pharmaceutical & High-Purity Applications
Applications requiring compliance with strict fugitive emission regulations (ISO 15848, TA-Luft)

Disclaimer: The above data is prepared based on common standards for bellows seal gate valves. Specific dimensions, materials, and pressure ratings may vary by manufacturer. The final technical agreement shall prevail.

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