3/4″-2500LB-RTJ*SW Welded Bonnet Globe Valve

Nominal Size 3/4 inch (DN 20)
Pressure Class Class 2500LB (equivalent to PN 420 bar)
End Connections RTJ (Ring-Type Joint) on one end, SW (Socket Weld) on the other end
Body-Bonnet Connection Welded bonnet
Structure Type Outside Screw & Yoke (OS&Y), Globe pattern

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3/4″-2500LB-RTJ*SW Welded Bonnet Globe Valve

Technical Data Sheet

Product: Welded Bonnet Globe Valve
Model / Size: 3/4″ – 2500LB – RTJ × SW (Mixed Ends)

Product Description

This valve features a fully welded body-to-bonnet connection, eliminating external leakage paths associated with traditional bolted bonnet designs. It is designed for high-temperature, ultra-high-pressure, toxic, flammable, and explosive services.
The valve is supplied with mixed end connections: one end is RTJ flange, the other end is socket weld, allowing installation between a flanged component and a pipe requiring socket weld termination. The disc and seat are hardfaced with Stellite for wear resistance and reliable shut-off.

Basic Parameters

Item	매개변수
공칭 크기	3/4 inch (DN 20)
Pressure Class	Class 2500LB (equivalent to PN 420 bar)
End Connections	RTJ (Ring-Type Joint) on one end, SW (Socket Weld) on the other end
Body-Bonnet Connection	Welded bonnet
Structure Type	Outside Screw & Yoke (OS&Y), Globe pattern

설계 표준

Item	기준
Design & Manufacture	API 602 (Compact steel gate, globe, and check valves) or ASME B16.34
Pressure-Temperature Rating	ASME B16.34
Flange Dimensions (RTJ)	ASME B16.5
Socket Weld Dimensions	ASME B16.11
Face-to-Face Dimensions	ASME B16.10 (applicable end-to-end length)
Inspection & Testing	API 598 (or ISO 5208)
Non-Destructive Examination	100% RT or UT of body-bonnet weld per ASME code

Bill of Materials (Typical Configuration)

Part Name	Material (Typical Options)	비고
몸	A105 / A182 F316 / F22 (Cr-Mo)	Selected based on service conditions
디스크	A105 + hardfacing / F316 + hardfacing	Stellite 6 or 21 hardfacing
좌석	Integral body seat with hardfacing	Stellite 6 overlay
줄기	A182 F6a (13Cr) / F316 / F304	Precipitation hardened or austenitic SS
Bonnet	Same material as body	Welded connection
Packing	Flexible graphite with anti-extrusion rings	Low-emission packing system
Handwheel / Stem Nut	Carbon steel / Copper alloy

Dimensions & Weight (Reference)

Item	Value
Face-to-Face (L)	Approx. 140 mm (end-to-end, based on ASME B16.10 short pattern for 2500LB)
RTJ Flange End	1/2″ RTJ flange per ASME B16.5 (ring groove dimensions for 3/4″ valve)
SW End	Socket weld per ASME B16.11, socket depth approx. 10 mm
Handwheel Diameter (W)	Approx. 150 mm
Overall Height (H)	Approx. 280 mm
Approx. Weight	14 ~ 18 kg (depending on material)

Note: Dimensions and weights are typical values and may vary by manufacturer.

Operating Conditions

Item	매개변수
Suitable Media	High-pressure steam, thermal oil, hydrogen, hydrocarbons, corrosive fluids
Temperature Range (Carbon Steel)	-29°C ~ 425°C
Temperature Range (Alloy Steel)	-29°C ~ 538°C (e.g., F22)
Temperature Range (Stainless Steel)	-196°C ~ 538°C
Max. Allowable Pressure	Approx. 42.0 MPa (420 bar) at ambient temperature (38°C)

Testing & Inspection

Shell Strength Test: 1.5 times rated pressure (hydrostatic); hold time per API 598.
High-Pressure Seat Test: 1.1 times rated pressure; no visible leakage.
Low-Pressure Pneumatic Test: 0.6 MPa compressed air; seat and packing leakage within allowable limits.
Body-Bonnet Weld Examination: 100% radiographic testing (RT) or ultrasonic testing (UT) per ASME Section VIII or equivalent.
Operational Test: Full stroke cycling under rated differential pressure to verify smooth operation.

Features & Benefits

Zero External Leakage: Full-penetration welded bonnet eliminates flange gasket leakage paths.
Ultra-High Pressure Capability: Class 2500 rating provides safety and reliability for extreme pressure systems.
Mixed End Configuration: RTJ flange on one end for high-pressure flange connections; socket weld on the other end for direct pipe welding, simplifying piping layouts.
Wear & Erosion Resistance: Disc and seat hardfaced with cobalt-based Stellite alloy for extended service life.
Fugitive Emission Compliance: Packing system can meet ISO 15848 or TA-Luft low-emission requirements.

Important Notes

Flow direction: Refer to the arrow marked on the body. If no arrow is present, confirm directionality with the manufacturer before installation.
RTJ flange: Requires the appropriate solid metal ring gasket (e.g., R18 for 1/2″ flange) and must be torqued to the specified value.
Socket weld end: Follow the approved Welding Procedure Specification (WPS) to avoid excessive weld stress that may affect valve performance.
Installation orientation: Typically installed vertically with handwheel upward unless otherwise specified.

보증:

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