NPS 34″ Class 900 BW API Standard Top Entry Ball Valve – WCB
NPS 34″ Class 900 BW API Standard Top Entry Ball Valve – WCB. Full in-line serviceability, DBB zero-leakage isolation, spring-energized floating seats, ISO 15848-1 AH low emission certified.
Description
The NPS 34″ Class 900 BW API Standard Top Entry Ball Valve – WCB is an engineered severe-service API 6D pipeline ball valve manufactured by XIAMEN GUTE VALVE MANUFACTURING COMPANY. Built with an integrally cast one-piece top-entry body, it offers unprecedented in-line serviceability—allowing full trim replacement directly from the top bonnet without removing the valve body or cutting welded pipe spools. Engineered with spring-energized floating seats, Double Block and Bleed (DBB) isolation, and automatic cavity pressure relief, it guarantees zero-leakage pipeline integrity across critical oil, gas, chemical, and slurry networks.
Engineering Configuration & Dimensional Data
NPS 34″ | Class 900 | WCB | BW Ends | API 6D
- Face-to-Face Length (L): 2159 mm (ASME B16.10 / API 6D)
- Assembly Center-to-Top Height (H): 1203 mm
- Operating Breakaway Torque: 100460 N·m
- Net Weight: 18570 kg (Bare-stem assembly)
- Actuation Interface: Heavy-Duty Enclosed Worm Gearbox (Bevel Gear) (ISO 5211 direct mounting pad configured)
- In-Line Serviceability: 100% top-access extraction of ball and seat rings without line cutting
Core Structural Innovation: In-Line Serviceability & Zero Pipeline Disturbance
The single-piece integrally cast valve body eliminates all intermediate split body joints and external bolting planes, providing maximum structural rigidity against extreme piping bending moments, soil settlement, and seismic stresses.
- Zero Pipeline Cutoff: Welded pipeline connections (BW) never require cutting, saving immense welding, radiographic testing (RT), and hydro-testing turnaround costs.
- Dedicated In-Line Extraction: Specialized extraction tools allow trunnion ball, seat rings, and stem packings to be lifted vertically through the top bonnet opening in hours rather than days.
- Self-Relieving Cavity: Internal spring-energized floating seats automatically relieve overpressure back into the upstream line when thermal cavity expansion occurs.
Rigorous Quality Assurance & API 6D Inspection Protocols
- 1. Material Chemistry Verification (PMI): 100% Spectro chemical verification on all pressure-retaining casting heats (ASTM A216 WCB / A352 LCB / A351 CF8M).
- 2. Hydrostatic Shell & Seat Integrity Testing: High-pressure liquid shell test (1.5x CWP), high-pressure seat closure test (1.1x CWP), and Double Block and Bleed (DBB) cavity integrity verification per API 6D / API 598 (Rate A Zero Leakage).
- 3. Fire-Safe Certified Construction: Rigorously tested and qualified in compliance with API 607 (7th Edition) and API 6FA.
- 4. Non-Destructive Examination (NDE): RT radiography, UT ultrasonic, and PT dye penetrant inspection on critical casting sections per ASME B16.34.
Frequently Asked Technical Questions
A: Traditional two-piece or three-piece split body ball valves require cutting the welded pipeline spools and grinding pipe ends for repair, demanding costly radiographic testing (RT) and pressure recertification. Gute Top Entry Ball Valves permit complete in-line overhaul: simply unbolting the top bonnet allows quick vertical extraction of the ball, seat rings, and spring assemblies while the valve body remains permanently welded in place, reducing plant turnaround downtime by over 70%.
A: When fully closed, both upstream and downstream floating seats seal independently against the ball, isolating fluid from the central body cavity. Trapped cavity fluid can be safely discharged via the body bleed plug. If trapped liquid undergoes ambient solar thermal expansion, the internal cavity pressure pushes the floating seat back against the spring pre-load, safely discharging excess pressure into the pipeline without requiring external relief piping.
Need Project-Specific Top Entry Ball Valve Sizing?
Contact Gute Valve engineering team for certified dimensional drawings, automated actuator sizing packages, NACE compliance datasheets, or high-temperature metal seat options.
Additional information
| Material | |
|---|---|
| Pressure | |
| Valve Size | |
| Connection | |
| Design Standard | API Standard |
| Size | NPS 34" |
| Pressure Class | Class 900 |
| Body Material | WCB |
| End Connection | BW |
| Operation | Heavy-Duty Enclosed Worm Gearbox (Bevel Gear), Electric & Pneumatic Actuation Ready (ISO 5211) |
| Design Structure | One-Piece Top-Entry Body / In-Line Serviceability / DBB / Cavity Self-Relieving |
| Manufacturer | XIAMEN GUTE VALVE MANUFACTURING COMPANY |
| Trim / Internals | API 6D Trim (Plated Trunnion Ball + Inconel X-750 Spring-Loaded Floating Seats + Emergency Sealant Fitting) |
