NPS 1/4″ Class 800 SW Forged Steel Globe Valve – LF2 – Welded Bonnet
NPS 1/4″ Class 800 SW Forged Steel Globe Valve – LF2 – Welded Bonnet - Image 2
NPS 1/4″ Class 800 SW Forged Steel Globe Valve – LF2 – Welded Bonnet - Image 3
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NPS 1/4″ Class 800 SW Forged Steel Globe Valve – LF2 – Welded Bonnet

Precision NPS 1/4″ Class 800 Forged Steel Globe Valve in LF2. API 602 / BS 5352 / ASME B16.34 compliant, contoured plug disc for linear throttling, Stellite hardfaced seat, bi-directional zero-leakage shutoff.

Technical Specifications
Size NPS 1/4″
Pressure Class Class 800
Body Material LF2
Connection End SW
SKU: FGLV-800-WB-LF2-1-4-SW Category:

Description

The NPS 1/4″ Class 800 Forged Steel Globe Valve (LF2) is a heavy-duty compact flow control and throttling valve engineered and manufactured by XIAMEN GUTE VALVE MANUFACTURING COMPANY in strict compliance with API 602 / BS 5352 / ASME B16.34. Purpose-built for boiler blowdown lines, chemical dosing injection manifolds, and high-velocity auxiliary steam isolation requiring cavitation resistance (NPS 1/4″ Class 800 LF2), this valve pairs an ultra-dense closed-die forged pressure boundary with an Outside Screw & Yoke (OS&Y) rising stem and an upward-closing plug disc to deliver exceptional throttling linearity and dependable bubble-tight isolation.

Technical Specification Matrix (FGLV-800-WB-LF2-1-4-SW)

Nominal Diameter / Size NPS 1/4″
Pressure Rating / Class Class 800
Design Standard API 602 / BS 5352 / ASME B16.34
Face-to-Face Sizing API 602 Compact Face-to-Face Dimensions
End Connection Topology Socket Weld (SW) per ASME B16.11 / Threaded (NPT) per ASME B1.20.1 / Flanged Raised Face (RF)
Pressure Boundary Metallurgy ASTM A352 LF2 Forged Low-Temperature Carbon Steel (Charpy V-notch impact tested down to -46°C / -50°F, grain-refined forging preventing brittle transition in cold climate utility and cryogenic gas headers)
Plug Disc & Seat Trim Contoured Plug Disc with Stellite® Cobalt-Base Hardfaced Seat Ring
Pressure Testing Mandate API 598 / API 602 High-Pressure Hydrostatic & Pneumatic Shell Test
Traceability & Certification EN 10204 3.1 Mill Test Certificate & PMI XRF Analysis Included

Engineering Highlights & Forged Architecture (NPS 1/4″)

  • Grain-Aligned Closed-Die Forging: High-integrity forging process aligns the molecular grain flow to withstand extreme cyclic hydraulic pressure spikes and pipeline vibrations without fatigue failure.
  • Anti-Blowout Stem with Renewable Backseat: Machined integral backseat shoulder allows online packing maintenance under full operating pressure while providing a secondary mechanical containment seal.
  • Stellite Armored Throttling Trim: Critical high-velocity fluid contact zones on the plug disc and body seat are overlaid with Stellite cobalt-base alloy, guaranteeing resistance against cavitation erosion and wire-drawing.
  • Bolted Bonnet Body Joint: High-tensile alloy studs compress a spiral-wound 316 stainless steel gasket with flexible graphite filler, ensuring leak-free joint containment under severe thermal gradients.

Quality Assurance, Inspection & NDT Protocols

  • 1. 100% Positive Material Identification (PMI): Spectro XRF chemical alloy verification on every LF2 forged body, bonnet, and trim component per ASTM E1476.
  • 2. Hydrostatic Shell & Throttling Seat Testing: 100% factory pressure tests verifying zero leakage per API 598 / API 602 High-Pressure Hydrostatic & Pneumatic Shell Test (Shell tested at 1.5x CWP).
  • 3. Dimensional Metrology & Thread Verification: CMM measurement of end-to-end lengths, socket weld depths, and NPT thread profiles.
  • 4. Full Compliance Documentation: Traceable EN 10204 3.1 Mill Test Reports supplied with every shipment.

Frequently Asked Technical Questions (FGLV-800-WB-LF2-1-4-SW)

Q2: Why is a forged steel pressure boundary superior to cast construction for small-bore Class 800 globe service?

A: Closed-die forging aligns the metallurgical grain flow along the contours of the valve body, completely eliminating internal porosity, shrinkage cavities, and micro-fissures inherent in small-diameter castings, ensuring absolute pressure containment under severe thermal and piping bending moments.

Q3: Can the stem packing be safely serviced or repacked under active pipeline line pressure?

A: Yes. In strict compliance with API 602, model FGLV-800-WB-LF2-1-4-SW incorporates an integral conical backseat shoulder on the stem. When rotated to the fully open position, this shoulder mates tightly against the bonnet backseat bushing, hermetically isolating the packing chamber from line pressure.

Q4: What hardfacing alloys are applied to the seating surfaces of this LF2 valve to prevent seat galling?

A: The seating face of both the plug disc and integral body seat ring are overlaid with precision-deposited cobalt-base Stellite alloy, retaining exceptional hardness (exceeding 40 HRC) and galling resistance across operating temperatures up to 593°C.

Need Technical Drawings or an RFQ Proposal?

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Proven in Severe Service: See how Gute's engineered flow equipment operates in major global applications in our Industrial Project References or explore technical selection criteria and material standards in our Technical Knowledge Base.

Additional information

Valve Type

Globe Valve
Size

NPS 1/4″
Pressure Class

Class 800
Bonnet Type

WB (Welded Bonnet)
Body Material

LF2
End Connection

SW
Face to Face

ASME B16.10
Inspection Standard

API 598
Fire Safe

API 607
Manufacturer

XIAMEN GUTE VALVE MANUFACTURING COMPANY
Material

Pressure

Valve Size

Connection

Valve Type

Design Standard

ASME Standard

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