Masoneilan 33000 Series

Triple Offset Butterfly Valves

Baker Hughes’s Masoneilan 33000 Series features patented triple offset design for high-performance, bi-directional tight shutoff across wide pressure and temperature ranges. The third offset angle and metal-to-metal seat reduce friction, enabling reliable isolation and control. It delivers zero leakage at lower cost than larger gate, globe, or ball valves.

Low Friction, Zero Leakage

Patented metal-to-metal seal achieves API 607 and ISO EN 10497 fire resistance and zero bi-directional leakage.
Offset conical seat reduces friction during throttling until closure.

Full Capacity Cv

Circular conical sealing offers low friction and maximum flow capacity (Cv). Better than traditional elliptical seals that increase wear and reduce flow.

Low Emissions

Certified to EPA Method 21 and ISO 15848 for low fugitive emissions under helium and methane.
Rotary motion reduces debris ingress and packing wear for longer seal life.

Specialty Applications

Metal-to-metal seats and optional extended bonnet enable zero leakage in harsh, cryogenic (-196°C) and fire-resistant conditions.

Less Downtime

Field-replaceable seat rings and two-piece disc design allow quick maintenance without full disassembly.
Saves plant downtime with easy inspection and part replacement.

Technical Specifications

Sizes

3" through 48" (80 through 1200 mm)
Ratings: ASME CL150 – CL600

Connections

Wafer, Lugged, Raised Face Flanged, RTJ Optional, EN Flange

Body Face To Face

Wafer and lugged bodies API 609 Table-3 (A) (Category B Valves up to 24”)
Double flanged short pattern: API609 table 3 (C) (Category B Valves up to 24”)
o Class 150: dimensions per ISO 5752 Basic series 13, EN 558-2, EN 593
o Class 300: dimensions per ISO 5752 Basic series 14, EN 558-2, EN 593

Body Materials

Carbon steel WCC, Stainless steel CF8M, Low Temperature Carbon Steel LCC, Others on request
Trim: Triple Offset

Seat Leakage

Class IV (Standard) per IEC 60534-4 &ANSI/FCI 70-2

Class V & VI (Optional) per IEC 60534-4 &ANSI/FCI 70-2

Zero Leakage (API 598)

Inherent Characteristics

Equal percentage

Actuator

Spring-Diaphragm, Scotch Yoke Piston, Manual Gear, Others on request

Downloads

Masoneilan has made various downloads available for the Masoneilan 33000 Series, including the specification sheet and the information sheet. These can be downloaded via the Masoneilan website.

View available downloads